Yes, that's true but the microprocessor can move the first oscillator to
compensate, thus slight shifting the frequency that gets converted to 9 mhz.
So the first local oscillator must be able to be moved in at least 10 hertz
or smaller steps to do this well.
Carl Moreschi N4PY
Franklinton, NC
----- Original Message -----
From: "Barry N1EU" <n1eu@yahoo.com>
To: <tentec@contesting.com>
Sent: Friday, March 07, 2003 11:05 PM
Subject: [TenTec] Orion 9 MHz filters
> I could be wrong, but I don't see how. Isn't the 9Mhz
> passband center of fixed frequency (i.e. 9Mhz)? If so,
> the 250hz spectrum that gets through the roofing
> filter is also fixed.
>
> 73,
> Barry N1EU
>
> > Carl,
> >
> > Does this mean that if I select, say a 250 Hz
> roofing filter that I can in
> > the IF play with that filter to get any 250 Hz of
> audio passband desired?
> > Say from 250 - 500 Hz, or 1250 - 1500 Hz or 2250 -
> 2500 Hz?
> >
> > 73,
> > Mark
>
>
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