[Elecraft] Data Jack for the K2

[Lyle Johnson]

Hello Julian!

> I can live with swapping the mic lead and the audio input, so I
> just wanted a constant output audio feed.

I assume you mean an audio tap that is not affected by the settingof the AF
GAIN control?

> Following a tip from someone on the reflector
> that I've not seen published anywhere, I attached a 1uF
> electrolytic to the junction of R10 and the drains...
> This works splendidly, so much so that I'm put off
> getting the KDSP2 because I don't believe it has a
> suitable audio take-off point...

You should be able to tap either the junction of R17/C10 or R18/C14 in the
same manner as you tapped the KAF2.  Ths is a low source-impedance location
designed to drive 20-ohm headphones.

Or, if you wish to stay entirely out of the audio path that you hear (to
avoid coupled noise back in, for example), you could tap your 1 uF
capacictor to J2 pin 4 or 5.  This is a so-called "line out" designed to
drive 600 ohms, and has its own amplifier path within the DSPx CODEC so
should be very well decoupled.

Now you may order a KDSP2 :-)

73,

Lyle KK7P