[Elecraft] K2 filter center frequency shift with band?

[Julian, G4ILO]

Chris Kantarjiev K6DBG wrote:
> 
> I'm playing in the RTTY Roundup this weekend, using a simple AFSK setup
> with my K2. For some reason, when operating on 15m I need to shift
> the Mark frequency to get the signals to fall inside the filter.
> 
> This doesn't match up with how I understand the K2's filters to work;
> I expect the center frequency of the filter to be the same regardless
> of the band.
> 
> What am I misunderstanding?
> 
> 
Nobody has answered this, so I'll try, though most of what I knew about the
K2 has been overwritten by K3 stuff. The K2 effectively swaps sidebands
above 17m so USB on 21MHz and above uses the filter settings for LSB on 17m
and below. I think your USB and LSB filters don't have symmetrical BFO
offsets. Rather than try to explain, I suggest you look at the relevant text
in the manual which is on page 95 in my copy: "Setting up Filters for
SSB/RTTY."

-----
Julian, G4ILO. K2 #392  K3 #222.
http://www.g4ilo.com/ G4ILO's Shack   http://www.ham-directory.com/ Ham
Directory    http://www.g4ilo.com/kcomm.html KComm for Elecraft K2 and K3 
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