[Elecraft] DATA Jack for K2??

[jperelst]

Thanks Don.
 
As always, you are a treasure.
 
Jon
KB1QBZ

  _____  

From: Don Wilhelm-4 [via Elecraft]
[mailto:ml-node+4543143-219819093 at n2.nabble.com] 
Sent: Tuesday, February 09, 2010 1:56 PM
To: jperelst
Subject: Re: DATA Jack for K2??


Jon, 

Yes, it is audio, so the only problems with breadboarding is the 
possibilities of inadvertent ground loops and/or RF pickup by the 
circuit(s).  Remember that mic levels are quite low, and that level is 
what you will  be driving the K2 with. 
So the answer depends on just how rough *your* 'breadboard' circuit is. 
I would recommend putting the fixed audio output board in the K2 - the 
raw K2 audio is low level and balanced, and you need a source of single 
ended audio output.  While one of the microHAM cable implementations 
draws audio from one side of this balanced signal, the level is lower 
than ideal. 
All the rest can be done outside the K2 in a small box.  How small 
really depends on the size of the transformers you use in the audio 
lines - you can salvage small transformers from defunct computer modem 
boards, they work well.  Alternately, you can follow Jim Brown's 
recommendations to bond the computer and radio together and perhaps 
eliminate the transformers. 

73, 
Don W3FPR 

jperelst wrote: 

> Thank you all for your replies. 
> 
> I should have known that Don Wilhelm already has a solution to the
problem!! 
> 
> As I understand it, all this is happening in audio frequencies versus
radio 
> frequencies.  Am I correct that I could breadboard all the necessary 
> circuitry outside the rig and not have to worry about creating PC boards
in 
> the rig? 
> 
> Jon 
> KB1QBZ 
>   
> ------------------------------------------------------------------------ 
> 
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