[Elecraft] Amplifier Thoughts

Sat Apr 1 10:22:56 EDT 2017

Someone here mentioned the amp would dissipate little with 90% efficiency for amp and power supply.  That is, of course, a dream even for high efficiency switch-mode amps.

There are several unique characteristics with SS amps.  They are truly different that that trusty and rugged old dual 3-500 Amp.

First, the power supply.  You can use a linear power supply, big transformer etc.  You can even regulate it if you like.  Most good transistors run in 50 VDC.  But this approach gets you back to that 75 pound transformer.  Switch mode power supplies at 50v 60-80 A are easily possible with today's technology.  But it also means that you will need PFC if you don't want to pop your breaker every time you tune up.  Efficiencies in the area of 85-90% are common for PFC + SMPS. You can do better at higher cost.

The amp itself is likely to achieve 55-60% efficiency depending on where you set the bias for AB2 operation and your actual operating conditions.  Note that this number varies with several factors including temperature.

Then there is SWR.  Remember that Drake L4B amp has a tunable matching network at the output that acts like an RF matching transformer to match the tube output impedance (K-ohms) to whatever antenna impedance you have.  It can tolerate a wide range of impedance --maybe 2:1 or even 3:1. This means that the 1500 W of RF power is efficiently sent down the coax--mismatch is handled.

In the case of a solid state amp, the output is matched to 50 Ohms or so.  Period.  So any mismatch means that RF is reflected back into the amp....where it is converted into heat.   Depending on your SWR, that could be substantial!  So let's say 3:1. Then 25% of the power is reflected.   Note: at 10:1 you reflect 67% of the power so that means 500 W reaches your antenna and 1000W is dissipated in the Drain-Source junctions of your expensive RF transistors!

So let's look at it this way.

You put out 1500 W
Amp efficiency is 60% = 1000w dissipated

Power supply = 87% = 374 W dissipated

Reflected at 3:1. 375 W

Total 1749 watts

Go turn on that 1500 W space heater to see what this feels like!

The design is almost more of a thermodynamic challenge than an RF challenge!!!

John Perlick
Aria Corporation
www.ariacorp.com

> On Mar 30, 2017, at 11:26 AM, "elecraft-request at mailman.qth.net" <elecraft-request at mailman.qth.net> wrote:
>
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> Today's Topics:
>
>   1. Re: K3/K3s; Digital modes, specifically DV (Matt Zilmer)
>   2. K3S and Winlink (Tom S Bingham)
>   3. Re: K3S and Winlink (Barry)
>   4. Re: Amplifier thoughts (John Marvin)
>   5. Re: K3/K3s; Digital modes, specifically DV (Richard Fjeld)
>   6. Re: Amplifier thoughts (Chris Tate - N6WM)
>   7.  Amplifier thoughts (john at kk9a.com)
>   8. Re: Amplifier thoughts (David Bunte)
>   9. Re: KX3 - AFSK RTTY (Fred Moore)
>  10. Re: Amplifier thoughts (Phil Hystad)
>  11. K3- padded carrying case (RLVZ at aol.com)
>  12. Re: K3- padded carrying case (Ian Kahn)
>  13. Re: Amplifier thoughts (Doug Smith)
>  14. Re: Amplifier thoughts (Arie Kleingeld PA3A)
>  15. OT: W0PW is SK (Ken G Kopp)
>  16. Re: Amplifier thoughts (John Meade W2XS)
>  17. Re: Amplifier thoughts (Ron D'Eau Claire)
>  18.  K3- padded carrying case (john at kk9a.com)
>  19. Re: Amplifier thoughts (Jim Brown)
>  20. Re: K3- padded carrying case (Mark E. Musick)
>  21. Re: Amplifier thoughts (Ron D'Eau Claire)
>  22. Re: Amplifier thoughts (Oliver Dr?se)
>  23. Re: Amplifier thoughts (Rick WA6NHC)
>  24. Re: Amplifier thoughts (Ron Wilcox)
>  25. Re: K3- padded carrying case (Bill Frantz)
>  26.   K3/100  +  P3  **Update** (Phil Hystad)
>  27. K2 bad encoder? (Dave Redfearn)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 28 Mar 2017 18:00:41 -0700
> From: Matt Zilmer <mzilmer at roadrunner.com>
> To: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] K3/K3s; Digital modes, specifically DV
> Message-ID: <80ed21e8-d07b-dfed-7e09-22c2840c93c9 at roadrunner.com>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
> I loaded FreeDV today, on an Ubuntu i5-64bit laptop. It works quite
> well.  I heard no calls on 14.236 MHZ, but the receive function is
> working.  I'm having the usual fun setting up PTT, but it will come
> along over time.
>
> Tried doing the same thing on the Windoze 7-64 box, and Panda AV decided
> it was a virus and sidetracked it, meaning it IS a virus.   That would
> be the installer program.  Has anyone else had this problem?  Just
> curious. I've had other programs trigger Panda to flush them, but
> nothing like this.
>
> Thanks and 73,
>
> matt W6NIA
>
>
>> On 3/27/2017 11:10 AM, Richard Fjeld wrote:
>> Greetings to all,
>>
>> The K3/K3s is an excellent radio for digital modes due to the ease of
>> interfacing with a computer if desired.  A computer is not even needed
>> for some digital modes, and I have tried that successfully.
>>
>> I have mentioned in the past that I had tried the free software for
>> digital voice on HF called 'FreeDV'.  I had worked a Canadian ham a few
>> times using it and he has been keeping in contact with me via email
>> encouraging me to get back into it.  I am starting to get up to date
>> again, and I found accurate reviews of it on
>> http://www.eham.net/reviews/detail/11016   by K2RWF and WA0TPN.  I think
>> you will find the reviews interesting and informative.
>>
>> Notice that the reviews seem to be either at, or near, 5/5 or 0/5. I
>> think both of the reviews I mentioned answer why that is.  I will keep
>> my experience mute and let you glean aye/nay from the reviews. Whether
>> you approve of digital voice or not, the K3/K3s is a natural for using
>> it, and it's fun.  (As always with digital modes, be kind to your finals.)
>>
>> FYI,
>> Dick, n0ce
>>
>>
>
> --
> "A delay is better than a disaster."
> -- unknonwn
>
> Matt Zilmer, W6NIA
> [Shiraz]
>
>
>
> ------------------------------
>
> Message: 2
> Date: Tue, 28 Mar 2017 18:25:09 -0700
> From: Tom S Bingham <tom at wb7eux.net>
> To: elecraft at mailman.qth.net
> Subject: [Elecraft] K3S and Winlink
> Message-ID: <f38800b3-cc1d-b05e-3d7e-28cea0c114be at wb7eux.net>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
> I have installed the Winlink software but I cannot place my K3S into
> transmit when using the Winmor protocol.  The channel selection feature
> changes frequencies on the rig properly.  And, when I place the K3S into
> transmit manually, the modem tones cause ALC to register.
>
> As a side note, Fldigi works fine.  Both Winlink and Fldigi are set to
> the same COMM port and the K3S is in USB mode with under CONFIG:RS232.
> Fldigi is not running when I use the Winlink software.  I use the
> Elecraft supplied KUSB cable between the computer and the K3S.
>
> Can anyone give me a clue?
>
> Thanks!
> Tom
>
> --
> Tom Bingham WB7EUX
> http://www.wb7eux.net/
> SKCC 9833S
> NAQCC 6346
>
>
>
> ------------------------------
>
> Message: 3
> Date: Wed, 29 Mar 2017 01:38:36 +0000
> From: Barry <k3ndm at comcast.net>
> To: tom at wb7eux.net, elecraft at mailman.qth.net
> Subject: Re: [Elecraft] K3S and Winlink
> Message-ID: <em420910fa-1f46-4bec-9a78-abdb6c9e97c9 at laptop3>
> Content-Type: text/plain; format=flowed; charset=utf-8
>
> Tom,
>     I'm not sure which Winlink software you are running, but it should
> work. Check to see that you have VOX on so that when you start to send
> tone the radio goes into transmit. If that is OK, you may need to tell
> your software to use software control for PTT.
>
> 73,
> K3NDM
> Barry
>
> ------ Original Message ------
> From: "Tom S Bingham" <tom at wb7eux.net>
> To: elecraft at mailman.qth.net
> Sent: 3/28/2017 9:25:09 PM
> Subject: [Elecraft] K3S and Winlink
>
>> I have installed the Winlink software but I cannot place my K3S into
>> transmit when using the Winmor protocol.  The channel selection feature
>> changes frequencies on the rig properly.  And, when I place the K3S
>> into transmit manually, the modem tones cause ALC to register.
>>
>> As a side note, Fldigi works fine.  Both Winlink and Fldigi are set to
>> the same COMM port and the K3S is in USB mode with under CONFIG:RS232.
>> Fldigi is not running when I use the Winlink software.  I use the
>> Elecraft supplied KUSB cable between the computer and the K3S.
>>
>> Can anyone give me a clue?
>>
>> Thanks!
>> Tom
>>
>> -- Tom Bingham WB7EUX
>> http://www.wb7eux.net/
>> SKCC 9833S
>> NAQCC 6346
>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Elecraft at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to k3ndm at comcast.net
>
>
>
> ------------------------------
>
> Message: 4
> Date: Tue, 28 Mar 2017 22:12:03 -0600
> From: John Marvin <jm-ec at themarvins.org>
> To: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] Amplifier thoughts
> Message-ID: <58DB3413.1030204 at themarvins.org>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
> Put me down as a vote against a built-in antenna tuner. I prefer a
> separate external tuner that integrates well with the amplifier. It
> allows for a lot more configuration flexibility.
>
> 73
> John
> AC0ZG
>
>> On 3/28/2017 5:00 PM, Paul Van Dyke wrote:
>> Ralph Parker said my list.....
>>
>> 1500w output, 160 - 6m.
>> 2 inputs.
>> 4  outputs (Manual switching is OK).
>> Built-in antenna tuner (good for 3:1 SWR).
>> Reasonably quiet fans.
>> Separate p/s, or remote control head (space considerations.  :-)
>>
>> Paul. KB9AVO?
>>
>>> On Mar 28, 2017 4:40 PM, "Ralph Parker" <ve7xf at shaw.ca> wrote:
>>>
>>> I better post this before I'm too late.
>>>
>>> I'd like:
>>> All the features of my KPA500, plus
>>> 1500w output, 160 - 6m.
>>> 2 inputs.
>>> 2 outputs (or more. Manual switching is OK).
>>> Built-in antenna tuner (good for 3:1 SWR).
>>> Reasonably quiet fans.
>>> Separate p/s, or remote control head (space considerations).
>>>    (I understand the difficulty of getting high power from the p/s to the
>>> PA.)
>>> I don't expect to carry it around, so weight is not a problem for me.
>>> Expeditions can use the KPA500 :-)
>>>
>>> When this amp is available, I'll sell amplifiers Ac and Am and buy one.
>>> I'm keeping my KPA-500!
>>>
>>> Ralph, VE7XF
>>>
>>> ______________________________________________________________
>>> Elecraft mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:Elecraft at mailman.qth.net
>>>
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>>> Message delivered to pvandyke1953 at gmail.com
>>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Elecraft at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to jm-ec at themarvins.org
>
>
>
> ------------------------------
>
> Message: 5
> Date: Wed, 29 Mar 2017 04:28:57 +0000
> From: Richard Fjeld <rpfjeld at outlook.com>
> To: "elecraft at mailman.qth.net" <elecraft at mailman.qth.net>
> Subject: Re: [Elecraft] K3/K3s; Digital modes, specifically DV
> Message-ID:
>        <CY4PR16MB181326713334AD930AC62E69BF350 at CY4PR16MB1813.namprd16.prod.outlook.com>
>
> Content-Type: text/plain; charset="Windows-1252"
>
> There are several FreeDV videos on YouTube.  Here is one that is a quick
> start guide.  I don't know if there are restrictions for posting links.
>
> https://www.youtube.com/watch?v=zijJ556cs08
>
> Dick, n0ce
>
>
>
>> On 3/28/2017 8:00 PM, Matt Zilmer wrote:
>> I loaded FreeDV today, on an Ubuntu i5-64bit laptop. It works quite
>> well.  I heard no calls on 14.236 MHZ, but the receive function is
>> working.  I'm having the usual fun setting up PTT, but it will come
>> along over time.
>>
>> Tried doing the same thing on the Windoze 7-64 box, and Panda AV
>> decided it was a virus and sidetracked it, meaning it IS a virus.
>> That would be the installer program.  Has anyone else had this
>> problem?  Just curious. I've had other programs trigger Panda to flush
>> them, but nothing like this.
>>
>> Thanks and 73,
>>
>> matt W6NIA
>>
>>
>
>
> ------------------------------
>
> Message: 6
> Date: Wed, 29 Mar 2017 04:47:42 +0000
> From: Chris Tate - N6WM <ctate at ewnetinc.com>
> To: John Marvin <jm-ec at themarvins.org>, "elecraft at mailman.qth.net"
>        <elecraft at mailman.qth.net>
> Subject: Re: [Elecraft] Amplifier thoughts
> Message-ID:
>        <236350B81BC09D42B8C3B41A97C654DD12AA7AA2 at AUSP01DAG0504.collaborationhost.net>
>
> Content-Type: text/plain; charset="utf-8"
>
> Perhaps an installable option would satisfy all...
>
> -----Original Message-----
> From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of John Marvin
> Sent: Tuesday, March 28, 2017 9:12 PM
> To: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] Amplifier thoughts
>
> Put me down as a vote against a built-in antenna tuner. I prefer a separate external tuner that integrates well with the amplifier. It allows for a lot more configuration flexibility.
>
> 73
> John
> AC0ZG
>
>> On 3/28/2017 5:00 PM, Paul Van Dyke wrote:
>> Ralph Parker said my list.....
>>
>> 1500w output, 160 - 6m.
>> 2 inputs.
>> 4  outputs (Manual switching is OK).
>> Built-in antenna tuner (good for 3:1 SWR).
>> Reasonably quiet fans.
>> Separate p/s, or remote control head (space considerations.  :-)
>>
>> Paul. KB9AVO?
>>
>>> On Mar 28, 2017 4:40 PM, "Ralph Parker" <ve7xf at shaw.ca> wrote:
>>>
>>> I better post this before I'm too late.
>>>
>>> I'd like:
>>> All the features of my KPA500, plus
>>> 1500w output, 160 - 6m.
>>> 2 inputs.
>>> 2 outputs (or more. Manual switching is OK).
>>> Built-in antenna tuner (good for 3:1 SWR).
>>> Reasonably quiet fans.
>>> Separate p/s, or remote control head (space considerations).
>>>    (I understand the difficulty of getting high power from the p/s
>>> to the
>>> PA.)
>>> I don't expect to carry it around, so weight is not a problem for me.
>>> Expeditions can use the KPA500 :-)
>>>
>>> When this amp is available, I'll sell amplifiers Ac and Am and buy one.
>>> I'm keeping my KPA-500!
>>>
>>> Ralph, VE7XF
>>>
>>> ______________________________________________________________
>>> Elecraft mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:Elecraft at mailman.qth.net
>>>
>>> This list hosted by: http://www.qsl.net Please help support this
>>> email list: http://www.qsl.net/donate.html Message delivered to
>>> pvandyke1953 at gmail.com
>>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Elecraft at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net Please help support this email
>> list: http://www.qsl.net/donate.html Message delivered to
>> jm-ec at themarvins.org
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html Message delivered to ctate at ewnetinc.com
>
> ------------------------------
>
> Message: 7
> Date: Wed, 29 Mar 2017 07:48:59 -0400
> From: "john at kk9a.com" <john at kk9a.com>
> To: elecraft at mailman.qth.net
> Subject: [Elecraft]  Amplifier thoughts
> Message-ID: <8d6a6601e07a9e031250505577d3eabe.squirrel at www11.qth.com>
> Content-Type: text/plain;charset=utf-8
>
> I guess we live in different worlds. My 10m-20m beams have an SWR <1.2:1
> anywhere in the band. I designed them this way and no luck is involved.
> the SWR is a little higher at the top of the band on my lower band
> antennas but certainly not in the 3:1+ range you are referring to. A 1kw+
> Elecraft solid state amp that could tolerate 2:1 or 2.5:1 with no foldback
> would be so awesome!
>
> John KK9A
>
>
> from: brian alsopb
> Tue Mar 28 19:30:31 EDT 2017
>
> KAT500 handles a much wider SWR range (like to about 10:1).
>
> Why do you assume people are lucky enough to have antennas with no more
> than a 3:1 SWR across the ham bands?
>
> Yes, higher SWR's require beefed up components but welcome to the real
> world.
>
> 73 de Brian/K3KO
>
>
>
> ------------------------------
>
> Message: 8
> Date: Wed, 29 Mar 2017 08:11:01 -0400
> From: David Bunte <dpbunte at gmail.com>
> To: "john at kk9a.com" <john at kk9a.com>
> Cc: "elecraft at mailman.qth.net" <elecraft at mailman.qth.net>
> Subject: Re: [Elecraft] Amplifier thoughts
> Message-ID:
>        <CANCJpbSPQdWsiNPO8KWRuj2LyLpDYDOyMKLMC=sSoxKoNOdtJw at mail.gmail.com>
> Content-Type: text/plain; charset=UTF-8
>
> John -
>
> I used to live in the world you do... but I now live in a neighborhood
> where I can't put up a tower, or even a multiband dipole. My 30' Flag Pole
> is OK, and, in fact, my neighbors think it is quite nice looking, but in
> order to use it on more than the one band where its unmatched SWR is less
> than 3:1, I must use a tuner.
>
> I don't expect to be in the market for an amp that is more capable than my
> KPA500, but my guess is that an optional, internal tuner capable of
> handling 1500 watts into a 3:1 or lower SWR, would suite quite a few
> potential users quite well. That way, someone like you, who does not need a
> tuner at all could opt to not order that option.
>
> If Elecraft chooses to market an external tuner capable of handling 1500
> watts into a 10:1 SWR, then I hope it is one that could be placed out at
> the antenna, and controlled remotely. For some folks, putting such a tuner
> in the shack, but out of sight would be equally appealing.
>
> Dave - K9FN
>
>> On Wed, Mar 29, 2017 at 7:48 AM, john at kk9a.com <john at kk9a.com> wrote:
>>
>> I guess we live in different worlds. My 10m-20m beams have an SWR <1.2:1
>> anywhere in the band. I designed them this way and no luck is involved.
>> the SWR is a little higher at the top of the band on my lower band
>> antennas but certainly not in the 3:1+ range you are referring to. A 1kw+
>> Elecraft solid state amp that could tolerate 2:1 or 2.5:1 with no foldback
>> would be so awesome!
>>
>> John KK9A
>>
>>
>> from: brian alsopb
>> Tue Mar 28 19:30:31 EDT 2017
>>
>> KAT500 handles a much wider SWR range (like to about 10:1).
>>
>> Why do you assume people are lucky enough to have antennas with no more
>> than a 3:1 SWR across the ham bands?
>>
>> Yes, higher SWR's require beefed up components but welcome to the real
>> world.
>>
>> 73 de Brian/K3KO
>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Elecraft at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to dpbunte at gmail.com
>>
>
>
> ------------------------------
>
> Message: 9
> Date: Wed, 29 Mar 2017 10:30:44 -0400
> From: Fred Moore <fred at fmeco.com>
> To: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] KX3 - AFSK RTTY
> Message-ID: <4da30632-a768-79ab-14e1-a504e453cc9b at fmeco.com>
> Content-Type: text/plain; charset=utf-8
>
> Keith, I have been on unix for the last 30 years, and fought with
> cocoModem for about 3 months, and finally came to the conclusion that it
> is not ready for prime time. I would get it working for several weeks,
> then it would quit..  I never got it to talk to my logging program even
> with applescript, finally I moved to fldigi with logging and rig control
> coming from rumlogNG and have never looked back... This gives more modes
> than cocoModem supports..
>
> I use both a signalink, and a small 7 dollar usb sound card depending on
> my location (home/portable).  I could use the existing soundcard in the
> mac, but just havn't build up a cable for that to work yet..
>
> As others have said, you are only concerned about your tone spacing, not
> the exact tones, the other end only sees space and mark tones..
>
> feel free to contact me direct if you want to talk about the issues I had..
>
> fwiw... regards.. Fred
>
> Fred Moore
> email: fred at fmeco.com
>       fred at safes.com
> phone:  321-217-8699
>
>> On 3/28/17 8:04 PM, Keith Onishi wrote:
>> I have been trying to set up for RTTY operation with KX3 + iMic + cocoaModem on Macbook Pro, but not successful.
>> Mode selection on KX3 is AFSK A and cocoaModem setup is matched to the KX3 setting.
>> RTTY signal received by KX3 appears not around 2125Hz but around 900Hz. So, I set cocoaModem?s mark frequency to 915Hz. With that setting, decoded text appears on the screen. KX3 VFO is properly tuned to the signal, of course.
>> When FSK D on KX3, all is same. RTTY signal appears around 900Hz as well.
>>
>> I found this had been discussed several years ago in the ML, but no change in KX3 specification since then.
>> I would like to know if this mark frequency is OK in QSO with other RTTY station.
>>
>> 73 de JH3SIF, Keith
>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Elecraft at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to fred at fmeco.com
>
>
>
>
> ------------------------------
>
> Message: 10
> Date: Wed, 29 Mar 2017 09:17:54 -0700
> From: Phil Hystad <phystad at mac.com>
> To: Elecraft Reflector <Elecraft at mailman.qth.net>
> Subject: Re: [Elecraft] Amplifier thoughts
> Message-ID: <656014C5-9555-4EBE-8307-FEEC4DAA4D74 at mac.com>
> Content-Type: text/plain; charset=us-ascii
>
> I used to own the 1 KW Icom PW1 linear amplifier.  It included within its huge & heavy
> black box the switching power supply and the 3:1 antenna auto-tuner.  I sold that
> amplifier because my eyes sparkled in delight with a much, much smaller desktop
> KPA500 from Elecraft.
>
> If this new 1.5 KW linear (if that is the power) becomes a reality, having it come in three
> separate boxes may make some sense.  Alternatively, like the Icom PW1, have a
> control head that sits on the shack desktop and the main unit containing everything
> else would be on the floor in a dark corner where it belongs (and, where I had my
> PW1).
>
> But, being honest, I will not be in the market for a larger amp as 100 watts seems
> quite a bit for my operations which is 99 percent CW and QRP ops or even 10-watt
> QRP ops with my KX2 is a lot of fun.
>
> 73, phil, K7PEH
>
>
>
>
>
> ------------------------------
>
> Message: 11
> Date: Wed, 29 Mar 2017 13:12:29 -0400
> From: RLVZ at aol.com
> To: elecraft at mailman.qth.net
> Subject: [Elecraft] K3- padded carrying case
> Message-ID: <c8884.4ff5e7b4.460d44fc at aol.com>
> Content-Type: text/plain; charset="US-ASCII"
>
> Hi Guys,
>
> Please advise what's currently available in padded equipment or carrying
> cases or the K3?  I'd like to the size to meet FAA "carry on"  requirements.
> (9x14x22")
>
> Thanks!
> Dick- K9OM
>
> ------------------------------
>
> Message: 12
> Date: Wed, 29 Mar 2017 13:17:56 -0400
> From: Ian Kahn <km4ik.ian at gmail.com>
> To: RLVZ at aol.com
> Cc: "elecraft at mailman.qth.net" <elecraft at mailman.qth.net>
> Subject: Re: [Elecraft] K3- padded carrying case
> Message-ID:
>        <CAFHjwP7Aw63vgNJHD-UtndB9A+wnvjm3dGm8Sr5RgjmKMHdj0Q at mail.gmail.com>
> Content-Type: text/plain; charset=UTF-8
>
> Dick,
>
> I've heard mention several times on this reflector of people using various
> sizes of Pelican case. They are tough, air- and water-tight, well-padded,
> and they make sizes that meet FAA carry-on guidelines.
>
> Hope this helps.
>
> 73 de,
>
> --Ian
> Ian Kahn, KM4IK
> Roswell, GA  EM74ua
> km4ik.ian at gmail.com
> 10-10 #74624  North Georgia Chapter #2038
> PODXS 070 #1962
> K3 #281, P3 #688 KAT500 #860, KPA500 #1468
>
> On Wed, Mar 29, 2017 at 1:12 PM, Dick via Elecraft <elecraft at mailman.qth.net
>> wrote:
>
>> Hi Guys,
>>
>> Please advise what's currently available in padded equipment or carrying
>> cases or the K3?  I'd like to the size to meet FAA "carry on"
>> requirements.
>> (9x14x22")
>>
>> Thanks!
>> Dick- K9OM
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Elecraft at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to km4ik.ian at gmail.com
>>
>
>
> ------------------------------
>
> Message: 13
> Date: Wed, 29 Mar 2017 11:28:26 -0600
> From: Doug Smith <doug at w7kf.com>
> To: "elecraft at mailman.qth.net" <elecraft at mailman.qth.net>
> Subject: Re: [Elecraft] Amplifier thoughts
> Message-ID: <4EB3956E-E5B6-45CF-A295-44E914CB3F17 at w7kf.com>
> Content-Type: text/plain;       charset=utf-8
>
> I cast my ballot for NO internal coupler.
>
> 1) An internal coupler is NOT needed by many who would rather not pay for something they don?t need.  Sure, it could be optional but see points 2 and 3.
>
> 2) An internal coupler at 1.5 KW as anything beyond a trivial ?line flattener? will be large.  If the matching range is extended to the 10 : 1 SWR range then the components will be *quite* large.  Feeding 1.5 KW into a 5 ohm load with an L-Network will require an inductor about the size of a K3S if any sort of Q is expected.
>
> 3) There exist RF transistors that are built to withstand high power operation with really high SWR values.  For example:
>
> http://www.nxp.com/products/rf/rf-power-transistors/rf-broadcast-and-ism/1-600-mhz-broadcast-and-ism/1500-w-cw-over-1.8-500-mhz-50-v-wideband-rf-power-ldmos-transistor:MRF1K50H <http://www.nxp.com/products/rf/rf-power-transistors/rf-broadcast-and-ism/1-600-mhz-broadcast-and-ism/1500-w-cw-over-1.8-500-mhz-50-v-wideband-rf-power-ldmos-transistor:MRF1K50H>
>
> Surely with such a device (or, better yet, a pair), a 3 : 1 SWR can be accommodated with no coupler at all.  Thus, no line flattener needed.
>
> If someone is trying to feed a 43 foot vertical on all bands at 1.5 KW then the coupler really should be at the antenna site, not in the shack.  That antenna presents a load of about 5 ohms -J500 and the coupler will have to be large at 1.5 KW.  (This is RF, not DC.  In a high pass L-Net think 18 amps and 9000 peak volts with a staggering 600 watts of losses generating heat in that coil.)
>
> As to the amp itself my wish list would include:
>
> 1) 1.5 KW ICAS.  (I would accept 1.3 KW but, hey, it?s a wish list.)  Must be contest capable, including those crazy RTTY guys.   ;-)
>
> 2) Separate light weight power supply.
>
> 3) QSK at reasonable speeds.  At least 40 WPM.
>
> 4) Multiple antenna outputs, remembered per band; overridable.
>
> 5) FULLY integrated with the K3S.  Given proper antenna loads the K3S + KPA1500 becomes a 1.5 KW transceiver.
>
> 6) A remote console setup would be cool.  That way the amp would be just a power block that could be set aside, out of the way.  Or, even operated at a remote site from the console.  TCP/IP connectivity for the console to power block.
>
> 73,
> Doug, W7KF
> http://www.w7kf.com <http://www.w7kf.com/>
>
>
>
>
> ------------------------------
>
> Message: 14
> Date: Wed, 29 Mar 2017 19:36:20 +0200
> From: Arie Kleingeld PA3A <pa3a at xs4all.nl>
> To: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] Amplifier thoughts
> Message-ID: <0945efd6-6e1d-456d-cee4-f392e1340c38 at xs4all.nl>
> Content-Type: text/plain; charset=windows-1252; format=flowed
>
> Who needs three boxes if it has a switching power supply and the amp
> itself has >90% efficiency?
> That would be a nice amp in the best Elecraft 'portable' tradition.
>
> This is the only 1.5kW linear I would consider buying as a replacement
> for my good old Commander.
>
> 73,
> Arie PA3A
>
> Op 29-3-2017 om 18:17 schreef Phil Hystad:
>> snip>
>>
>> If this new 1.5 KW linear (if that is the power) becomes a reality, having it come in three
>> separate boxes may make some sense.  Alternatively, like the Icom PW1, have a
>> control head that sits on the shack desktop and the main unit containing everything
>> else would be on the floor in a dark corner where it belongs (and, where I had my
>> PW1).
>>
>> < snip
>>
>>
>
>
>
> ------------------------------
>
> Message: 15
> Date: Wed, 29 Mar 2017 12:31:22 -0600
> From: Ken G Kopp <kengkopp at gmail.com>
> To: Elecraft <elecraft at mailman.qth.net>
> Subject: [Elecraft] OT: W0PW is SK
> Message-ID:
>        <CAD4CdTNUaBwym5Ksp4xqbmrgiFFeaY_skONVXN2KwP+f0+5BOg at mail.gmail.com>
> Content-Type: text/plain; charset=UTF-8
>
> Sad to report that Don Hilliard - W0PW ... a long-time
> friend ... died on Saturday.  Don was the designer of the
> famous NBS Yagi.  See the W0PW page on QRZ,com
> for more.
>
> 73!
>
> Ken Kopp - K0PP
>
>
> ------------------------------
>
> Message: 16
> Date: Wed, 29 Mar 2017 11:34:05 -0700 (MST)
> From: John Meade W2XS <john.meade at freqelec.com>
> To: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] Amplifier thoughts
> Message-ID: <1490812445409-7628620.post at n2.nabble.com>
> Content-Type: text/plain; charset=us-ascii
>
> I noticed the frequencies shown on the NXP web site for their reference
> circuits:
>
> 81.36 MHz
> 230 MHz
> 87.5 to 108 MHz
>
> and .........
>
> 27 MHz!
>
> 73,  John W2XS
>
>
>
> --
> View this message in context: http://elecraft.365791.n2.nabble.com/Amplifier-thoughts-tp7628611p7628620.html
> Sent from the Elecraft mailing list archive at Nabble.com.
>
>
> ------------------------------
>
> Message: 17
> Date: Wed, 29 Mar 2017 11:47:43 -0700
> From: "Ron D'Eau Claire" <ron at cobi.biz>
> To: <elecraft at mailman.qth.net>
> Subject: Re: [Elecraft] Amplifier thoughts
> Message-ID: <000601d2a8bc$f37e3ba0$da7ab2e0$@biz>
> Content-Type: text/plain;       charset="utf-8"
>
> An SWR approaching 10:1 means high RF voltages on a coaxial line at the voltage loops and high current flows at the current loops requiring a very heavy-duty transmission line - likely a nitrogen-filled hard line at 1.5 kW or, at the very least, a very heavy Teflon insulated line. In practice, it is usually the voltage breakdown that kills coax.
>
> Of course high SWR also means high losses between the amp and the antenna.
>
> The power ratings published by coax cable suppliers are based on a low SWR -- typically less than 1.5:1.
>
> The bottom line is that going QRO means a more careful design and installation of the entire antenna system.
>
> 73, Ron AC7AC
>
>
>
> -----Original Message-----
> From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of brian
> Sent: Tuesday, March 28, 2017 4:31 PM
> To: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] Amplifier thoughts
>
> KAT500 handles a much wider SWR range (like to about 10:1).
>
> Why do you assume people are lucky enough to have antennas with no more than a 3:1 SWR across the ham bands?
>
> Yes, higher SWR's require beefed up components but welcome to the real world.
>
> 73 de Brian/K3KO
>
>
>
> ------------------------------
>
> Message: 18
> Date: Wed, 29 Mar 2017 14:53:13 -0400
> From: "john at kk9a.com" <john at kk9a.com>
> To: elecraft at mailman.qth.net
> Subject: [Elecraft]  K3- padded carrying case
> Message-ID: <f88ada432312abfb3eaf80d7b57aa5f2.squirrel at www11.qth.com>
> Content-Type: text/plain;charset=utf-8
>
> I use a Rose Kopp bag and put that in my hard shell carry-on along with
> other accessories. I have traveled to the Caribbean with it multiple times
> without issue.
>
> John KK9A
>
> from: RLVZ
> Wed Mar 29 13:12:29 EDT 2017
>
> Hi Guys,
>
> Please advise what's currently available in padded equipment or carrying
> cases or the K3?  I'd like to the size to meet FAA "carry on"  requirements.
> (9x14x22")
>
> Thanks!
> Dick- K9OM
>
>
>
> ------------------------------
>
> Message: 19
> Date: Wed, 29 Mar 2017 12:11:09 -0700
> From: Jim Brown <jim at audiosystemsgroup.com>
> To: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] Amplifier thoughts
> Message-ID:
>        <e051d573-8ece-8a07-a493-778649529b5a at audiosystemsgroup.com>
> Content-Type: text/plain; charset=windows-1252; format=flowed
>
>> On Wed,3/29/2017 11:47 AM, Ron D'Eau Claire wrote:
>> An SWR approaching 10:1 means high RF voltages on a coaxial line at the voltage loops
>
> Remember that the SWR on a transmission line, and thus the loss in the
> line, is determined ENTIRELY by the match between the antenna and the
> line, NOT between the line and the transmitter.
>
> The SWR measured at the transmitter is a measure of the difference
> between the impedance the transmitter WANTS to drive and the impedance
> of the load connected to it. If that INDICATED SWR is high, a solid
> state transmitter will "throttle itself back" to protect itself, but
> that's not LOSS. The function of an antenna tuner is to make the
> transmitter happy by giving it a load that it's designed for, so that it
> can put out its full power.
>
> For example, a long wire antenna of random length might be nowhere near
> 50 ohms resistive, so must be transformed to 50 ohms resistive so that
> the transmitter can put power into it. Likewise, an antenna perfectly
> matched to 75 ohm coax or 150 ohm twin lead has no excess loss in the
> line but needs a matching network to make the transmitter happy.  My
> high dipoles (at 100 - 140 ft) are fed with 75 ohm coax to minimize the
> loss in the line.
>
> 73, Jim K9YC
>
>
>
> ------------------------------
>
> Message: 20
> Date: Wed, 29 Mar 2017 19:55:23 -0000
> From: "Mark E. Musick" <markmusick at sbcglobal.net>
> To: <john at kk9a.com>,    <elecraft at mailman.qth.net>
> Subject: Re: [Elecraft] K3- padded carrying case
> Message-ID: <[email protected]>
> Content-Type: text/plain;       charset="us-ascii"
>
> Dick,
> Here is the link to Rose's website.
> https://www.smugmug.com/gallery/n-mX9LCZ/i-vLrLtL2
> She also makes a case for the P3 as well as other Elecraft radio equipment.
> I have one for the K3 and one for the P3. They will satisfy your
> requirements.
>
> 73,
> Mark Musick, WB9CIF
>
> -----Original Message-----
> From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of
> john at kk9a.com
> Sent: Wednesday, March 29, 2017 6:53 PM
> To: elecraft at mailman.qth.net
> Subject: [Elecraft] K3- padded carrying case
>
> I use a Rose Kopp bag and put that in my hard shell carry-on along with
> other accessories. I have traveled to the Caribbean with it multiple times
> without issue.
>
> John KK9A
>
> from: RLVZ
> Wed Mar 29 13:12:29 EDT 2017
>
> Hi Guys,
>
> Please advise what's currently available in padded equipment or carrying
> cases or the K3?  I'd like to the size to meet FAA "carry on"  requirements.
> (9x14x22")
>
> Thanks!
> Dick- K9OM
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html Message
> delivered to markmusick at sbcglobal.net
>
>
>
> ------------------------------
>
> Message: 21
> Date: Wed, 29 Mar 2017 12:59:00 -0700
> From: "Ron D'Eau Claire" <ron at cobi.biz>
> To: <elecraft at mailman.qth.net>
> Subject: Re: [Elecraft] Amplifier thoughts
> Message-ID: <000a01d2a8c6$e9147a30$bb3d6e90$@biz>
> Content-Type: text/plain;       charset="us-ascii"
>
> Yes, and that's why the SWR measured at the transmitter is lower than the
> actual SWR (measured at the antenna) due to the loss in the line.
>
> My point is that the sort of SWR we might accept at lower powers quickly
> becomes impractical at higher powers because of the constraints imposed by
> the transmission line. The sort of coaxial line most Hams use, even  the
> super low-loss big stuff, simply cannot handle the voltages produced by a
> high SWR.
>
> The place to do the matching is at the antenna end of the transmission line.
> So how about a weather proofed remote QRO ATU that goes at the antenna end
> of the transmission line? As others pointed out such an ATU won't be small
> due to the potentially huge voltages and currents involved, it won't be
> lightweight and it certainly won't be cheap.
>
> 73, Ron AC7AC
>
>
>
> -----Original Message-----
> From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Jim
> Brown
> Sent: Wednesday, March 29, 2017 12:11 PM
> To: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] Amplifier thoughts
>
>> On Wed,3/29/2017 11:47 AM, Ron D'Eau Claire wrote:
>> An SWR approaching 10:1 means high RF voltages on a coaxial line at
>> the voltage loops
>
> Remember that the SWR on a transmission line, and thus the loss in the line,
> is determined ENTIRELY by the match between the antenna and the line, NOT
> between the line and the transmitter.
>
> The SWR measured at the transmitter is a measure of the difference between
> the impedance the transmitter WANTS to drive and the impedance of the load
> connected to it. If that INDICATED SWR is high, a solid state transmitter
> will "throttle itself back" to protect itself, but that's not LOSS. The
> function of an antenna tuner is to make the transmitter happy by giving it a
> load that it's designed for, so that it can put out its full power.
>
> For example, a long wire antenna of random length might be nowhere near
> 50 ohms resistive, so must be transformed to 50 ohms resistive so that the
> transmitter can put power into it. Likewise, an antenna perfectly matched to
> 75 ohm coax or 150 ohm twin lead has no excess loss in the line but needs a
> matching network to make the transmitter happy.  My high dipoles (at 100 -
> 140 ft) are fed with 75 ohm coax to minimize the loss in the line.
>
> 73, Jim K9YC
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html Message
> delivered to ron at elecraft.com
>
>
>
> ------------------------------
>
> Message: 22
> Date: Wed, 29 Mar 2017 22:05:42 +0200
> From: Oliver Dr?se <droese at necg.de>
> To: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] Amplifier thoughts
> Message-ID: <948475ba-199f-798c-0033-a0e024683b92 at necg.de>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
> And please do away with the 15 dB amplification limit for all sales
> outside the USA. Nobody else has that rule in place so we should not
> suffer from it. ;-)
>
> 73, Olli
>
> Contest, DX & radio projects: http://www.dh8bqa.de
>
>
>> Am 29.03.2017 um 01:00 schrieb Paul Van Dyke:
>> Ralph Parker said my list.....
>>
>> 1500w output, 160 - 6m.
>> 2 inputs.
>> 4  outputs (Manual switching is OK).
>> Built-in antenna tuner (good for 3:1 SWR).
>> Reasonably quiet fans.
>> Separate p/s, or remote control head (space considerations.  :-)
>>
>> Paul. KB9AVO?
>>
>>> On Mar 28, 2017 4:40 PM, "Ralph Parker" <ve7xf at shaw.ca> wrote:
>>>
>>> I better post this before I'm too late.
>>>
>>> I'd like:
>>> All the features of my KPA500, plus
>>> 1500w output, 160 - 6m.
>>> 2 inputs.
>>> 2 outputs (or more. Manual switching is OK).
>>> Built-in antenna tuner (good for 3:1 SWR).
>>> Reasonably quiet fans.
>>> Separate p/s, or remote control head (space considerations).
>>>    (I understand the difficulty of getting high power from the p/s to the
>>> PA.)
>>> I don't expect to carry it around, so weight is not a problem for me.
>>> Expeditions can use the KPA500 :-)
>>>
>>> When this amp is available, I'll sell amplifiers Ac and Am and buy one.
>>> I'm keeping my KPA-500!
>>>
>>> Ralph, VE7XF
>>>
>>> ______________________________________________________________
>>> Elecraft mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:Elecraft at mailman.qth.net
>>>
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>>> Message delivered to pvandyke1953 at gmail.com
>>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Elecraft at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to droese at necg.de
>
>
>
> ------------------------------
>
> Message: 23
> Date: Wed, 29 Mar 2017 15:07:48 -0700
> From: Rick WA6NHC <wa6nhc at gmail.com>
> To: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] Amplifier thoughts
> Message-ID: <5ca57ea7-c227-ec7e-4741-60e9cd7e1f13 at gmail.com>
> Content-Type: text/plain; charset=windows-1252; format=flowed
>
> Or in my case, the use of ladder line (durned HOA infested area) to
> handle the near 20:1 on 160M (better on most other bands) so that the
> loss is from the tuner to the antenna, not the final.
>
> My solution is that I'm moving to a location better suited for antennas,
> far far away in a land called Idaho.  ;-)
>
> Rick wa6nhc
>
>
>> On 3/29/2017 11:47 AM, Ron D'Eau Claire wrote:
>> An SWR approaching 10:1 means high RF voltages on a coaxial line at the voltage loops and high current flows at the current loops requiring a very heavy-duty transmission line - likely a nitrogen-filled hard line at 1.5 kW or, at the very least, a very heavy Teflon insulated line. In practice, it is usually the voltage breakdown that kills coax.
>>
>> Of course high SWR also means high losses between the amp and the antenna.
>>
>> The power ratings published by coax cable suppliers are based on a low SWR -- typically less than 1.5:1.
>>
>> The bottom line is that going QRO means a more careful design and installation of the entire antenna system.
>>
>> 73, Ron AC7AC
>>
>>
>>
>> -----Original Message-----
>> From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of brian
>> Sent: Tuesday, March 28, 2017 4:31 PM
>> To: elecraft at mailman.qth.net
>> Subject: Re: [Elecraft] Amplifier thoughts
>>
>> KAT500 handles a much wider SWR range (like to about 10:1).
>>
>> Why do you assume people are lucky enough to have antennas with no more than a 3:1 SWR across the ham bands?
>>
>> Yes, higher SWR's require beefed up components but welcome to the real world.
>>
>> 73 de Brian/K3KO
>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Elecraft at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to wa6nhc at gmail.com
>
>
>
> ------------------------------
>
> Message: 24
> Date: Wed, 29 Mar 2017 16:12:35 -0600
> From: Ron Wilcox <rglogan73 at gmail.com>
> To: Rick WA6NHC <wa6nhc at gmail.com>
> Cc: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] Amplifier thoughts
> Message-ID:
>        <CABVxxD0BEeb1DWx+W7mck4YJBxjfrVrO=RncOLaY3bjR1=2XGQ at mail.gmail.com>
> Content-Type: text/plain; charset=UTF-8
>
> Idaho is a great place for our hobby. That is where I got my start in the
> 80's from Don KA7T. Good luck. I am excited about the chatter the last week
> or so about our wishes for an amp. Hope it happens. There have been some
> great ideas so far.
>
> Today is a good day to have a Great Day!
> 73       Ron Wilcox KF7ZN
>
>> On Wed, Mar 29, 2017 at 4:07 PM, Rick WA6NHC <wa6nhc at gmail.com> wrote:
>>
>> Or in my case, the use of ladder line (durned HOA infested area) to handle
>> the near 20:1 on 160M (better on most other bands) so that the loss is from
>> the tuner to the antenna, not the final.
>>
>> My solution is that I'm moving to a location better suited for antennas,
>> far far away in a land called Idaho.  ;-)
>>
>> Rick wa6nhc
>>
>>
>>> On 3/29/2017 11:47 AM, Ron D'Eau Claire wrote:
>>>
>>> An SWR approaching 10:1 means high RF voltages on a coaxial line at the
>>> voltage loops and high current flows at the current loops requiring a very
>>> heavy-duty transmission line - likely a nitrogen-filled hard line at 1.5 kW
>>> or, at the very least, a very heavy Teflon insulated line. In practice, it
>>> is usually the voltage breakdown that kills coax.
>>>
>>> Of course high SWR also means high losses between the amp and the antenna.
>>>
>>> The power ratings published by coax cable suppliers are based on a low
>>> SWR -- typically less than 1.5:1.
>>>
>>> The bottom line is that going QRO means a more careful design and
>>> installation of the entire antenna system.
>>>
>>> 73, Ron AC7AC
>>>
>>>
>>>
>>> -----Original Message-----
>>> From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of
>>> brian
>>> Sent: Tuesday, March 28, 2017 4:31 PM
>>> To: elecraft at mailman.qth.net
>>> Subject: Re: [Elecraft] Amplifier thoughts
>>>
>>> KAT500 handles a much wider SWR range (like to about 10:1).
>>>
>>> Why do you assume people are lucky enough to have antennas with no more
>>> than a 3:1 SWR across the ham bands?
>>>
>>> Yes, higher SWR's require beefed up components but welcome to the real
>>> world.
>>>
>>> 73 de Brian/K3KO
>>>
>>> ______________________________________________________________
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>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:Elecraft at mailman.qth.net
>>>
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>>> Message delivered to wa6nhc at gmail.com
>>>
>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Elecraft at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to rglogan73 at gmail.com
>>
>
>
> ------------------------------
>
> Message: 25
> Date: Wed, 29 Mar 2017 16:26:54 -0700
> From: Bill Frantz <frantz at pwpconsult.com>
> To: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] K3- padded carrying case
> Message-ID:
>        <r470Ps-10124i-A1401B44763141758CDBE04F7EEFCFBE at Williams-MacBook-Pro.local>
>
> Content-Type: text/plain; charset=UTF-8; format=flowed
>
> I have one of her cases for my KX3, which I put in a soft-sided
> suitcase when I fly. She does excellent work.
>
> 73 Bill AE6JV
>
> On 3/29/17 at 12:55 PM, markmusick at sbcglobal.net (Mark E.
> Musick) wrote:
>
>> Here is the link to Rose's website.
>> https://www.smugmug.com/gallery/n-mX9LCZ/i-vLrLtL2 She also
>> makes a case for the P3 as well as other Elecraft radio equipment.
>> I have one for the K3 and one for the P3. They will satisfy your
>> requirements.
>
> -----------------------------------------------------------------------
> Bill Frantz        | "The only thing we have to   | Periwinkle
> (408)356-8506      | fear is fear itself." - FDR  | 16345
> Englewood Ave
> www.pwpconsult.com | Inaugural address, 3/4/1933  | Los Gatos,
> CA 95032
>
>
>
> ------------------------------
>
> Message: 26
> Date: Wed, 29 Mar 2017 16:28:25 -0700
> From: Phil Hystad <phystad at mac.com>
> To: Elecraft Reflector <Elecraft at mailman.qth.net>
> Subject: [Elecraft]   K3/100  +  P3  **Update**
> Message-ID: <500FDCC9-629F-465F-AE86-AFC224582381 at mac.com>
> Content-Type: text/plain; charset=utf-8
>
>
> I am posting this ad for a friend, Fred KE7FB, who is reluctantly selling his K3+P3.  Fred?s e-mail address is listed below and you can contact him or me (Phil) or both of us for any questions on the items listed or photos of the equipment.
>
> For Sale:  K3/100 and P3
>
> The complement included in the K3, serial number #6183:
>
>   ? K3/100 with standard 2.7 kHz Filter
>   ? KAT3:    K3 ATU Option
>   ? KXV3A:  RX Ant., IF Out and Xverter Interface Option
>   ? KFL3A-250-R:   250 Hz, 8-Pole Filter
>   ? KFL3A-400-R:   400 Hz, 8-Pole Filter
>   ? KFL3A-1.0K-R:  1 kHz, 8-Pole Filter
>   ? MH2:  Hand Held microphone for the K3
>   ? KUSB: Universal Serial Bus Adapter
>
> This K3 (modular kit) is fully assembled and calibrated per Elecraft calibration procedures.  It is fully
> functional with no dents, no scratches, and no dust or dirt on the cabinet.  Used only in a non-smoking
> environent.
>
> Also, Elecraft documentation for the K3 plus the Fred Cady ?Elecraft K3? book.
>
> For Sale:   P3-K Panadapter for the K3
>
> The P3-K, Panadapter for the K3, serial # 1870 is fully assembled and completely functional with no
> dents, no scratches, and also it has no dust or dirt on it either.  Used only in a non-smoking
> environment.
>
> A spiral bound copy of the P3 documentation will be included (the original documentation was lost
> in transit during move from Oregon to Wisconsin or worse, lost somewhere down in the basement
> of the house).  So, a bound copy of the full downloaded and printed documentation for the P3 is included.
>
> This equipment is offered individually or bundled together for a slight discount.
>
> K3:  $2000 inclusive of shipping with insurance to any CONUS address destination.
> P3:  $450 inclusive of shipping with insurance to any CONUS address destination.
>
> Discounted package of K3+P3:  $2300 inclusive of shipping and insurance to any CONUS address destination.
>
> Payment by Paypal direct to Fred Birch (the seller) at fbirch48 at gmail.com.
>
> Preference will be given to sales of the bundled K3+P3 but all offers will be seriously considered in the
> order they are received.
>
> If interested or if you have questions about this offer please contact me off list.
>
> Also, I (posting this ad for Fred) can be contacted at this address or with Phil?s (K7PEH) address
> offline for any additional questions and photos of the equipment.
>
> 73, Fred, KE7FB
> fbirch48 at gmail.com
>
> Posted by Phil, K7PEH
> phystad at mac.com
>
>
>
> ------------------------------
>
> Message: 27
> Date: Wed, 29 Mar 2017 19:39:23 -0500
> From: "Dave Redfearn" <n4elm at bellsouth.net>
> To: <elecraft at mailman.qth.net>
> Subject: [Elecraft] K2 bad encoder?
> Message-ID: <00f601d2a8ee$14a49960$3dedcc20$@net>
> Content-Type: text/plain;       charset="us-ascii"
>
> I just got a used K2 which came from an estate.
>
> Not much info but it looks like it was built in 2000, serial number 02136.
>
>
>
> When trying to tune, it looks like the encoder is not working properly.
>
> When tuning clockwise (up) the frequency barely moves even when turning the
> knob rapidly.
>
> When tuning counterclockwise (down) the frequency moves a little more but
> not much even when turning the knob rapidly.
>
>
>
> Other frequency control functions work - step, VFO A/B, band up/down
>
>
>
> To me this looks like the encoder is bad.
>
>
>
> I do not see any info in the manuals on troubleshooting the encoder.
>
>
>
> Is there anything I can test to verify the encoder or do I need to go
> directly to Elecraft for a replacement?
>
>
>
> Thanks for any help.
>
>
>
>
>
>
>
> 73,
> Dave Redfearn
> ARS N4ELM  Lafayette, LA
>
> QRL? de N4ELM/qrp
>
>
>
>
>
> ------------------------------
>
> Subject: Digest Footer
>
> _______________________________________________
> Elecraft mailing list
> Post to: Elecraft at mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/elecraft
> You must be a subscriber to post.
> Elecraft web page: http://www.elecraft.com
>
> ------------------------------
>
> End of Elecraft Digest, Vol 155, Issue 45
> *****************************************