[Elecraft] Passband tuning

Thu May 9 19:52:03 2002

Guys, PBT would rock on the K2!!!

>From: "Sverre Holm - LA3ZA" <[email protected]>
>
>Lyle,
>
>From what you are saying about passband tuning, I can see no problem in
>implementing it in the K2 hardware as it is today. I would think that
>moving the main oscillator and the BFO in sync in opposite directions
>could be done in software. So we'll ask for it to be put on the wish
>list for ver 3.0 of the software!
>
>Sverre
>
>-----Original Message-----
>From: [email protected]
>[mailto:[email protected]] On Behalf Of Lyle Johnson
> > > > And it would make passband tuning a breeze :-)
> >
> > > Doesn't this require a dual-conversion receiver where the second
> > > oscillator is offset from its normal frequency?
>
> > No, you just move the HFO the same amount, but in the opposite
>direction, as you move the BFO.
> > The net result is that the receiver stays tuned to the same incoming
>frequency, but the passband
> > is shifted. No extra conversion necessary.  And with the CPU
>controlling both oscillators
> > precisely, it would work quite well.  As has been pointed out, you can
>do this crudely by setting > up more filter positions in the K2 to
>achieve the same end - but then you lose the ability to
> > select a narrower filter...

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