[Elecraft] Combo pre-amp
Joe Subich, W4TV
lists at subich.com
Sun May 26 01:04:39 EDT 2013
I don't know about that ... the incremental cost for the KXV3A
vs. KXV3 was minimal. The firmware changes to support two more
control lines should be minimal.
As far as an internal preamp - it should not be significantly more
complex than the PR6. With switching on a "KVX3B", an internal
preamp would not need the bypass relays so they could be used for
band switching if needed. However, if the user did not want a
10/12 preamp, it would not be a stretch to use the existing PR6
internally for six meters only.
One would think it relatively straightforward to switch two input
tuning/matching networks in a PR6 style preamp or an alternate,
broadband design could be used to completely avoid the need for
band switching. With a little care in the design and programming,
a higher gain/lower nf preamp could be substituted (electronically)
for the standard preamp or the controls could be arranged to cycle
through "none"/"norm"/"opt".
73,
... Joe, W4TV
On 5/25/2013 10:48 PM, Gary Gregory wrote:
> Ah Joe,
>
> Thankyou for resurrecting my thought that it IS possible. The issue will
> most likely be a lack of quantity that would be sold versus the cost to
> manufacture,
>
> I will live in hope...:-)
>
> thanks for the info Joe, much appreciated.
>
> 73
>
> Gary
>
> On 26 May 2013 12:45, Joe Subich, W4TV <lists at subich.com> wrote:
>
>>
>>> let's not let that technical inconvenience reduce in any
>>> way my hope for a cure to my sometimes demented desires....:-)
>>
>> I'm not saying it isn't possible ... takes one additional relay
>> and two connectors. There are even couple unused control lines
>> on the KXV3A that could be used to control the added relay and
>> switch bands (10/12 and 6 M) if necessary.
>>
>> 73,
>>
>> ... Joe, W4TV
>>
>>
>> On 5/25/2013 10:13 PM, Gary Gregory wrote:
>>
>>> Hi Joe,
>>>
>>> Gee...Shhhhh....let's not let that technical inconvenience reduce in any
>>> way my hope for a cure to my sometimes demented desires....:-)
>>>
>>> Of course you are quite correct Joe. Point taken mate.
>>>
>>> 73
>>>
>>> Gary
>>>
>>> On 26 May 2013 12:06, Joe Subich, W4TV <lists at subich.com> wrote:
>>>
>>>
>>>> So, I will continue to want an internal pre-amp and it does not need
>>>>
>>>>> to be for 6M as I don't operate there either. This is MY choice and
>>>>> does not hold sway with the masses but it is my choice after all.
>>>>>
>>>>>
>>>> I agree that an internal preamp (or premps) would be ideal. However,
>>>> in addition to the preamp(s) Elecraft would need to provide *another*
>>>> design for the KXV3A - one that switches the RX ANT IN/OUT connections
>>>> to internal jacks - as neither the original KXV3 or current KXV3A have
>>>> that capability.
>>>>
>>>> 73,
>>>>
>>>> ... Joe, W4TV
>>>>
>>>>
>>>> On 5/25/2013 9:24 PM, Gary Gregory wrote:
>>>>
>>>> I don't wish to flog a dead horse any further, however, choice is
>>>>> something
>>>>> it seems everyone on this list is after.
>>>>>
>>>>> So what if a K3 needs to NOT have a 2M transverter to fit a combo
>>>>> pre-amp?....there are many K3's in the world not fitted with 2M. This
>>>>> is a
>>>>> choice made by the original owner I guess which is what it is, a
>>>>> choice. I
>>>>> fully appreciate everyone's point of view, but I would hazard a guess I
>>>>> am
>>>>> not alone in wanting an internal unit as a CHOICE, not at the expense of
>>>>> taking away other folks right to choose.
>>>>>
>>>>> Wayne has stated Elecraft's case and that is there is not enough room
>>>>> but
>>>>> his statement is qualified by the mention of the 2M option which is a
>>>>> customer choice right?
>>>>>
>>>>> So, I will continue to want an internal pre-amp and it does not need to
>>>>> be
>>>>> for 6M as I don't operate there either. This is MY choice and does not
>>>>> hold
>>>>> sway with the masses but it is my choice after all.
>>>>>
>>>>> You mention remote install, fine, but again it is still another cable
>>>>> and
>>>>> still yet another box to cart around. Setup on a table (standard picnic
>>>>> size) the depth of the table means you need to have the K-Line right on
>>>>> the
>>>>> rear edge and the 6M pre-amp protrudes far enough back that if you are
>>>>> up
>>>>> against a barrier of some sort, the cables push the K-Line forward and
>>>>> reduce the work space area such that little room is left to operate in a
>>>>> comfortable manner.
>>>>>
>>>>> I could pontificate forever on the drawbacks when operating portable
>>>>> but I
>>>>> am probably not a member of the right choir.
>>>>>
>>>>> Maybe an OEM will come up with a 'plug-in' internal 10M pre-amp designed
>>>>> for a K3.....now that would solve everything for me and I wouldn't have
>>>>> to
>>>>> plead my case....:-)
>>>>>
>>>>> It's all about choice folks!
>>>>>
>>>>> 73
>>>>>
>>>>> Gary
>>>>>
>>>>> On 26 May 2013 10:32, Walter Underwood <wunder at wunderwood.org> wrote:
>>>>>
>>>>> The original poster mentioned "those of us who operate portable".
>>>>> Running
>>>>>
>>>>>> cables to the next room does not make that any simpler.
>>>>>>
>>>>>> wunder
>>>>>> K6WRU
>>>>>>
>>>>>> On May 25, 2013, at 5:13 PM, Dr. William J. Schmidt, II wrote:
>>>>>>
>>>>>> This sounds like a lack of creative thinking. How about using two 90
>>>>>>
>>>>>>>
>>>>>>> degree
>>>>>>
>>>>>> BNC elbows on the back of the radio and a couple of BNC jumpers. You
>>>>>>> can
>>>>>>> put the preamp anywhere... even in the next room is that is your
>>>>>>> fancy.
>>>>>>> Also, you might try one of the 50+ preamps that are already available
>>>>>>> by
>>>>>>>
>>>>>>> a
>>>>>>
>>>>>> variety of companies with ultra-low noise figures. I'm not sure I
>>>>>>> need
>>>>>>> a
>>>>>>> preamp to take up the space of my existing 2 meter module.
>>>>>>>
>>>>>>>
>>>>>>> Dr. William J. Schmidt - K9HZ / J68HZ/ 8P6HK/ ZF2HZ
>>>>>>>
>>>>>>> Owner - Operator
>>>>>>> Big Signal Ranch
>>>>>>> Staunton, Illinois
>>>>>>>
>>>>>>> email: bill at wjschmidt.com
>>>>>>>
>>>>>>> -----Original Message-----
>>>>>>> From: elecraft-bounces at mailman.qth.****net<elecraft-bounces at mailman.*
>>>>>>> *qth.net <elecraft-bounces at mailman.qth.net>>
>>>>>>> [mailto:elecraft-bounces@**mai**lman.qth.net <http://mailman.qth.net>
>>>>>>> <elecraft-bounces@**mailman.qth.net<elecraft-bounces at mailman.qth.net>
>>>>>>>> ]
>>>>>>> On Behalf Of Jeff Cochrane
>>>>>>> Sent: Saturday, May 25, 2013 7:03 PM
>>>>>>> To: elecraft at mailman.qth.net
>>>>>>> Subject: Re: [Elecraft] Combo pre-amp
>>>>>>>
>>>>>>> Agreed Gary,
>>>>>>> I too would be interested in an internal 10M pre-amp (or an internal
>>>>>>>
>>>>>>> combo
>>>>>>
>>>>>> 6-10M pre-amp).
>>>>>>> I already have the PR6 but like you say it (in stock form) protrudes
>>>>>>> so
>>>>>>>
>>>>>>> far
>>>>>>
>>>>>> out behind the rig that it almost impossible to use for portable work.
>>>>>>> Mounting it internally is the way to go and I reckon a combo pre-amp
>>>>>>>
>>>>>>> would
>>>>>>
>>>>>> sit nicely where the internal 2M transverter normally goes.
>>>>>>>
>>>>>>> Jeff Cochrane - VK4XA
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> Gary Gregory-2 wrote
>>>>>>>
>>>>>>> Well I do hope there will be a version for 10M perhaps that will
>>>>>>>> install
>>>>>>>> within the K3. Much as it would be nice to have I am not going to buy
>>>>>>>>
>>>>>>>> more
>>>>>>>
>>>>>>
>>>>>> boxes needing to be plugged in, cabled or whatever.
>>>>>>>
>>>>>>>>
>>>>>>>> Whilst I understand some folks have space available and can wire in
>>>>>>>> as
>>>>>>>> many
>>>>>>>> boxes as are available, those of us who operate portable tire very
>>>>>>>>
>>>>>>>> quickly
>>>>>>>
>>>>>>
>>>>>> of sorting cables, boxes and the resultant tangled leads.
>>>>>>>
>>>>>>>>
>>>>>>>> I guess I will have to wait and see what is produced but another
>>>>>>>>
>>>>>>>> external
>>>>>>>
>>>>>>
>>>>>> box such as the 6M pre-amp which protrudes too far and can easily be
>>>>>>>
>>>>>>>> knocked around is a non starter for me no matter that I could use it,
>>>>>>>> it
>>>>>>>> is
>>>>>>>> what it is, a box too far.
>>>>>>>>
>>>>>>>> Gary
>>>>>>>>
>>>>>>>> --
>>>>>>>> *Gary - VK1ZZ
>>>>>>>> Skype: Gary.VK1ZZ
>>>>>>>> Motorhome Portable
>>>>>>>> The Shack*
>>>>>>>> *Elecraft K3
>>>>>>>> P3 Panadapter
>>>>>>>> KPA500FT
>>>>>>>> KAT500FT**
>>>>>>>> KX3-K
>>>>>>>> *
>>>>>>>> ______________________________****____________________________**
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>>>>>>>> Elecraft mailing list
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>>>>>>>>>
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>>>>>>>>>
>>>>>>>> Post: mailto:
>>>>>>>>
>>>>>>>>
>>>>>>> Elecraft at .qth
>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>
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>>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> -----
>>>>>>> Jeff Cochrane - VK4XA
>>>>>>> East Innisfail
>>>>>>> Queensland
>>>>>>> Australia
>>>>>>> K3 #4767
>>>>>>>
>>>>>>> --
>>>>>>> View this message in context:
>>>>>>>
>>>>>>> http://elecraft.365791.n2.**na**bble.com/Combo-pre-amp-**<http://nabble.com/Combo-pre-amp-**>
>>>>>>>
>>>>>> tp7573740p7574221.html<http://**elecraft.365791.n2.nabble.com/**
>>>>>> Combo-pre-amp-**tp7573740p7574221.html<http://elecraft.365791.n2.nabble.com/Combo-pre-amp-tp7573740p7574221.html>
>>>>>>>
>>>>>>
>>>>>> Sent from the Elecraft mailing list archive at Nabble.com.
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>>>>>>>
>>>>>> --
>>>>>> Walter Underwood
>>>>>> wunder at wunderwood.org
>>>>>>
>>>>>>
>>>>>>
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>>>>>>>
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>>>>>
>>>>>
>>>>>
>>>
>>>
>
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