[Elecraft] IF tap?

[Don Wilhelm]

Steve,

One cannot usually use a spectrum analyzer "in situ" like you would an 
oscilloscope - the spectrum analyzer has a 50 ohm input and will load 
the "circuit under test" significantly.  That is why you need the buffer 
amplifier.

73,
Don W3FPR

On 1/2/2012 5:35 PM, Steve KC8QVO wrote:
> Just playing around here - I dug out my manual and found the RX Mixer. 
> I tapped the Post-Mixer Amp side of C159 and the ground side of R80 
> with a length of RG-174. Then I ran that back to the receive antenna 
> connector on the 160 module (desoldered the wires to the 160 module). 
> I figured this would give me a 4.915mHz reference from which to tap 
> but it doesn't work too well. There's more to learn here for sure. I 
> figured there would be a place in the circuit I could tap to bring out 
> the IF to the analyzer. Would I not be correct in assuming that the 
> spectrum analyzer can read the same signal(s) fed to the rest of the 
> K2's receiver?