[Elecraft] Passband tuning

Fri May 10 19:29:01 2002

Passband tuning would be fine, except for one problem: Who can come up
with a suitable passband tuning control???

73, Sverre
-----------

Sverre Holm, LA3ZA
Asker, Norway (59.8N, 10.4E)
---------------------------------
www.qsl.net/la3za

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Eddy Avila
Sent: 10. mai 2002 01:47
To: [email protected]
Subject: RE: [Elecraft] Passband tuning

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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