[Elecraft] Re: passband tuning

[Wayne Burdick]

Lyle,

This is already on the wish list. At present there isn't enough code
space to implement it, so we may have to wait until Microchip comes out
with a larger ROM controller that will fit in the same space as the
18C452. Could be a while.

73,
Wayne


Lyle Johnson wrote:
> 
> > ... It also, alas, means giving up the convenience of passband tuning...
> 
> Actually, it doesn't.  New K2 firmware, for example, could use the RIT
> control to adjust passband tuning, by computing and adjusting the offset of
> the PLL ref oscillator (pulls the VFO) and the BFO.  Move them equal amounts
> in frequency, and you shift the passband.  A push of PF1 could be used, for
> example, to toggle the function of the knob from RIT to PBT, so you could
> have both functions in the radio.
> 
> The K2 is first and foremost, a CW rig.  CW rigs don't much need PBT, as you
> can just keep narrowing the filter at your preferred pitch to reject
> off-frequency interference.  This is what the K2 does.
> 
> >...though it can be simulated to some extent with the variable bandwidth
> filters and BFO settings...
> 
> For SSB operation, you can do the "crude" method by setting up filter
> positions.  But I'd sure rather just turn the knob to get what makes it
> easier for me to copy, rather than have LOW-NORMAL-HIGH as it is currently
> limited to.
> 
> 72,
> 
> Lyle KK7P
> 
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