[Elecraft] K2 BFO

[Don Wilhelm]

Jerry,

Yes, you need to have the counter probe plugged into TP2 to save thee 
BFO frequency.
You can build your own probe - if you use #14 solid wire, it will fit 
nicely into the test points.
Solder the 11pF right above the tip and coax up to the header on the 
Control Board - the shield goes closest to the left side panel.

73,
Don W3FPR

On 6/28/2021 11:00 AM, jerry wrote:
> Hello all,
>
>    I note that my new ( to me ) K2 is not well set up on the BFO for 
> the narrow CW filters.  It's fine for the 1.5kHz one, but the audio 
> passband is too high for all the narrower ones - so I cannot "spot" 
> tune.   If my sidetone is set to say 600Hz,
> it's on the lower slope of the audio peak.
>
>   It seems to be straightforward to adjust the BFO per filter with the 
> CAL FIL function.  With a tablet running a spectrum analyzer, I can 
> pull the audio spectrum right down to where it needs to be, no problem.
>
>   HOWEVER, when I try to save it, I get "INFO 230" which means that 
> the frequency counter is not connected to the BFO.  And the passband 
> doesn't stay changed.
>
>   Is it true that the rig will refuse to save the BFO setting unless 
> it can measure the BFO frequency?
>
>    My radio came to me without a frequency probe.  I do have one on 
> order from Elecraft.  I also have enough junk to make one.  A hunk of 
> RG316, some dupont connectors, an 11pf dipped silver mica capacitor.
>
>   But - at the moment, I really don't want to do any of that stuff.  I 
> just want to slide the audio output spectrum down to where I can get 
> on with operating.  And I'm not interested in the numerical BFO 
> reading.  Ultimately, I will set up the filters from scratch - I have 
> the upgraded crystals AND the SSB adapter on order.
>
>  Can the radio REALLY not save the BFO setting unless it can measure it?
>
>                      - Jerry KF6VB