[Elecraft] Amp power per $$ spreadsheet download

[Igor Sokolov]

> Expert has serious issues with SO2R - limitation to a single multi-band
> antenna on the SO2R port, inability to externally control which rig has
> the 'run' antennas vs. which is limited to the SO2R antenna and no way
> to control separate antennas for each radio.

Yes, it is somewhat limited but still usable and much better then nothing. I 
have used it with multiband 80 through 10 m beam and  a set of stacks for 
all bands as main antennas. Works very well and covers 90% of my needs.

>
>> P.S. I have used my K3 with Expert 1K-FA for 6 years and now use my
>> KX3 and K3 with Expert 1.3K-FA (5W in 1kW out).
>
> It would be better if there was a 6 dB pad (or 6 dB of NFB) between the
> T/R switch and amplifier so you ran the K3 at 20W for 1 KW output.  The
> entire system would be much cleaner - lower IMD, etc.

There is a pad built in but it can be bypassed by user if needed.

73, Igor UA9CDC

> 73,
>
>    ... Joe, W4TV
>
>
> On 2015-04-27 1:10 PM, Igor Sokolov wrote:
>> IMHO this is apple/orange comparison.
>>
>> 1) All of the Expert amps are solid state AND automatic and this
>> comparison does not account for that.
>> 2) USD/WATT is more informative then USD/dB_over_100W. USD/dB_of_gain
>> would be...
>> 3) If weight of the amp is put into the table then Expert will be clear
>> winner on all accounts.
>> 4) Features like built in SO2R and ability to operate on any mains
>> voltage from 100V to 260V are not found in any other amp but sure add a
>> lot value for money.
>>
>> 73, Igor UA9CDC
>>
>> P.S. I have used my K3 with Expert 1K-FA for 6 years and now use my KX3
>> and K3 with Expert 1.3K-FA (5W in 1kW out). Will anybody try to persuade
>> me that there is better value for money then Expert.
>>
>> ----- Original Message ----- From: "Jim Brown" 
>> <jim at audiosystemsgroup.com>
>> To: <elecraft at mailman.qth.net>
>> Sent: Monday, April 27, 2015 2:34 AM
>> Subject: Re: [Elecraft] Amp power per $$ spreadsheet download
>>
>>
>>> On Sat,4/25/2015 7:35 PM, Phil Wheeler wrote:
>>>> Good job, Nick.  I didn't realize my AL-811H was so cost effective.
>>>> Sure is a royal PITA to use, though. I'll give it away to someone
>>>> local who will use it -- no way I will deal with shipping the beast.
>>>
>>> I modified the spreadsheet a bit and re-sorted it. First, since we
>>> here in the US are permitted only 1,500W, I set max power for those
>>> amps with higher power ratings to that value. Second, just as Nick has
>>> included his used Alpha 99, I added my used Ten Tec Titan 425s.
>>>
>>> k9yc.com/PwrAmpdB.png
>>>
>>> There are many features and properties of power amps that go far
>>> beyond pure dB per dollar.  some examples:
>>>
>>> The ACOM 1010 is a reasonably compact competitor to the KPA500, but it
>>> doesn't cover 6M. I bought one used from K6SRZ (to have another amp
>>> for CQP), who bought a KPA500 just to get 6M. Also, my occupied
>>> bandwidth tests show that the KPA500 is a bit cleaner than that ACOM
>>> 1010. And the 1010 is a single-voltage amp. It must be rewired to
>>> change it. The KPA500 can be switched by removing, rotating, and
>>> reinserting the fuse block built into the power plug.
>>>
>>> The ACOM 1000 does cover 6M. Both it and the 1010 have manual antenna
>>> tuners built in. Some of these amplifiers have built-in tuners, some
>>> of those tuners are automatic or have memories. Some of these amps are
>>> much better built than others. My Ten Tec Titans use high quality
>>> vacuum relays with logic to prevent hot-switching, as do the Alphas.
>>> The Ameritron amps I've seen use much cheaper open-frame relays, so
>>> their switching is much slower.
>>>
>>> My Titans are quite clean -- P3 measurements of both the KPA500 and
>>> the Titan look exactly like the K3 at the drive level required for
>>> rated power. But the Titans, like the lower cost ACOMs, are "manual
>>> everything.
>>>
>>> 73, Jim K9YC
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