W3FPR K2 Fixed AF Output Circuit PC Board... a query on demand for these

[Tom Hammond-2]

Folks:

Nearly four years ago, Don Wilhelm sent me his design for a fixed AF output
circuit for the K2. This was mainly for folks wanting to drive external audio
inputs, usually sound cards, etc.

I designed a PC board for Don, including input and output jacks, and an output
pot to control the output level.

Don had a batch of PC boards made by FAR Circuits and sold the circuit as, I
think, kits of parts.

During the past several years, Don decided that the original circuit not do the
best job of allowing for optimal placement (and mounting) of the PC board, so
he re-engineered his remaining existing PC boards to eliminate the I/O jacks,
the pot, and to lay all components flat (for a lo-profile) so he could then
install the PC board between the FP and CTRL boards, using an available 4-40
screw. Previously the board was being installed out in the 'body' of the K2
chassis, up against one side cover.  You may go to

     http://w3fpr.qrpradio.com/K2_Fixed_Audio_Output.htm

     Info on the original circuit, PC board, and mounting

and

     http://w3fpr.qrpradio.com/download_files/FP-CB%20mounting%20photos.pdf

     Info on Don's current mounting method.

to see Don's writings on this circuit and the new mounting method.

Well, Don's now run out of kits and has no present plans of offer this kit
again in the near future.  Of course, it figgers... as soon as he runs out
of the kits, he starts getting requests for the circuit again...

I ran off a batch of a dozen newly re-designed boards a few weeks ago. The
new boards were specifically designed to provide a low-profile installation
and to utilize Don's latest installation method (e.g. between the K2 FP and
CTRL PC boards. As it turned out, this batch had one small design flaw, I
missed grounding the GND pin of the LM386. Fortunately it was a small job of
bridging the ground pin to the nearby ground foil to solve the problem, and
all 12 boards disappeared quickly.

I have now run off another small batch (15) of PC boards if anyone is in need
of such a circuit, and if there's enough interest I'll have FAR Circuits make
a 'production' run of a batch of them for resale. SO right now, though I do
have some boards for sale ($6 ppd to US mailboxes, $7 to DX), I'm really
trying to gauge future interest, so I can decide whether to have a larger
run of PC boards made.

If you are (or might be) interested in purchasing one of the W3FPR K2 Fixed
AF Output PC boards, please drop me a note so I can get a feel for whether it
would be worth the effort to have some made commercially for resale.

I will be happy to e-mail a copy of the current PC board design and info to
anyone who is interested. These work well with PC-based CW/digital decoding
softwares.

73,

Tom Hammond   N0SS

p.s.

I'll be away from the shack for a week (March 12-18) so any replies to e-mails
may have to wait until I return. But please reply NOW... you if you're like me,
you'll FORGET!


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[Doug Faunt N6TQS [phone]]

I still have a batch of the W3FPR boards available, too.
I sent off a number, but have more.

73, doug

   Date: Mon, 10 Mar 2008 17:31:41 -0500
   From: Tom Hammond <[hidden email]>

   Folks:

   Nearly four years ago, Don Wilhelm sent me his design for a fixed AF output
   circuit for the K2. This was mainly for folks wanting to drive external audio
   inputs, usually sound cards, etc.

   Well, Don's now run out of kits and has no present plans of offer this kit
   again in the near future.  Of course, it figgers... as soon as he runs out
   of the kits, he starts getting requests for the circuit again...
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[DW Holtman]

Hello,

I have a question which might not make much sense. I have seen the Web links
to a couple of people who have remotely mounted a 100 watt amp from a K2
and an antenna tuner in an EC-2 enclosure.

Would it be possible to use the same remote amp/tuner to work with a K3? The
specs are basicly the same, ie 10 watts in, 100 watts out. It would savbe a
lot of $$$ if one remote amp/tuner could be used for two radios. I'm
thinking the communication to the amp would be the problem, but not sure.
Has this been brought up before?

Best,
DW Holtman
WB7SSN

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[Mike B-12]

Good evening, DW.  Yes, this has been asked before (and is a logical question to
me), and made it into the FAQ.  I found 2 topics which apply.  No need to fill
email in-boxes with what's already on the web, so just the links:

http://www.elecraft.com/K3/K3FAQ.htm#auxbus

http://www.elecraft.com/K3/K3FAQ.htm#KPA3%20integration

Hope this answers you questions.

73,

Mike
KW1ND

DW Holtman wrote:

> Hello,
>
> I have a question which might not make much sense. I have seen the Web
> links to a couple of people who have remotely mounted a 100 watt amp
> from a K2 and an antenna tuner in an EC-2 enclosure.
>
> Would it be possible to use the same remote amp/tuner to work with a K3?
> The specs are basicly the same, ie 10 watts in, 100 watts out. It would
> savbe a lot of $$$ if one remote amp/tuner could be used for two radios.
> I'm thinking the communication to the amp would be the problem, but not
> sure. Has this been brought up before?
>
> Best,
> DW Holtman
> WB7SSN

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