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List:       elecraft
Subject:    [Elecraft] Amps with K2
From:       <edauer () aya ! yale ! edu>
Date:       2022-01-30 5:30:36
Message-ID: 000d01d8159a$82acf6f0$8806e4d0$ () aya ! yale ! edu
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I have used W8FGU's amplifier keying system with a K2 and a KPA1500 and can
say it works just as advertised.  The KPA1500 output is in the 200 - 225
watt range on CW (as I remember -- I did the tests a few months ago),
depending on band and K2 power setting; the TR switching time is fine for
fast break CW; and there is no discernible attenuation on receive.  The amp
does not poll directly for frequency, but using N1MM and the KIO2 the
frequency for logging purposes is there with no fuss.  The installation is
straightforward -- one small circuit board and then mount the board and an
RCA jack in an existing hole on the K2 rear deck and it's on the road.
Neat.

Ted, KN1CBR
------------------------------

Message: 14
Date: Sat, 29 Jan 2022 19:57:33 +0000
From: "Dave Van Wallaghen" <dave@w8fgu.com>
To: KJ <kjpj27@gmail.com>, "Elecraft Reflector"
	<elecraft@mailman.qth.net>
Subject: Re: [Elecraft] KPXA-100 & K2 Integration?
Message-ID: <ema7b36147-ff70-427d-bde8-abc60b6325ce@desktop-w8fgu>
Content-Type: text/plain; charset=utf-8; format=flowed

. . .  There are a number of circuits documented out there for this purpose.
I also sell a kit for doing this on my website: 
https://www.w8fgu.com/k2_trdriver.html. This circuit and kit was based on
one produced years ago by Tom Hammond, N0SS (SK). If you have the K60XV
module installed, then you can bring out the K60XV J2 pin 2 for this
purpose. I am doing exactly that on my K2. I mounted an RCA jack on the rear
panel and tied it to that pin.

The above will allow the K2 to drive an amp, but will not get you much
"integration". With our amplifier line, band switching can be automated with
a dit of RF from the K2. But other than that, tight integration like with
our newer transceivers is not there. The cables I am trying to develop will
attach to the K2's KIO2 AUX I/O port and provide keying. I have prototyped
one to work with the KXPA100 and it keys properly and allows RS-232 commands
to pass through the KXPA100 from the PC for control of the K2 by software
programs. The main issue with integrating the K2 with our amps is that there
is virtually no codes space left in the K2 firmware for having it
communicate and integrate with the other amps like it did with the KPA100.
So, things like amp power output and SWR will not be reflected on the K2
like it does with the KX2 & 3 when used with the KXPA100.. . . 

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