[Elecraft] K2: IF Tap Point

[Jim KO5V]

Don,

Thank you, that makes sense.

73, Jim KO5V


-----Original Message-----
>From: Don Wilhelm <donwilh at embarqmail.com>
>Sent: Feb 15, 2019 10:41 AM
>To: Jim KO5V <ko5v at earthlink.net>, Elecraft List <elecraft at mailman.qth.net>
>Subject: Re: [Elecraft] K2: IF Tap Point
>
>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