[Elecraft] K2: IF Tap Point

[Don Wilhelm]

Jim,

The IF take-off point normally used for the K2 is at J12 pin 1 which is 
after the Post-Mixer amplifier.  That point provides a signal that is 
about equal in strength to the antenna input affords isolation for BFO 
leakthrough.

For everyone's information, DX Engineering is selling the Clifton Labs 
buffer amplifier (but not the specific K2 version that Jack Smith (SK) 
also sold.

73,
Don W3FPR


On 2/15/2019 12:02 PM, Jim KO5V wrote:
> Good morning,
> 
> I have a HupRF PAT tap buffer amp board for my K2's IF. I installed an SMA connector on the heatsink panel
> when I built the rig.
> 
> Looking at the K2's block diagram, the IF is shown between the mixer and post-mixer pre-amp. On the schematic,
> that appears to be between Z6, pin 2, and C159. My plan is tap the mixer-side of C159, then attach the ground
> braid to the ground side of R80. Is this the right way to do this?
> 
> I've searched this reflector, and the web, and I can't really find anything specific using "K2 IF out", etc.
> 
> SDR kits' site (they sell G4HUP's kits since Dave passed away), and the HupRF site have no instructions for
> Elecraft rigs. There are links to installation instructions in the most popular Yaekencom radios, but not the K2,
> even though they are selling the K2 boards.
> 
> Thanks again. 73,
> 
> Jim KO5V