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Re: choice of IF frequencies



Direct conversion radios work nicely for SSB, AM and PM. The only problem
for me is that they can't support FM reception and almost all AMSAT digital
satellites have a FSK downlink.

73,

John
KD6OZH

----- Original Message -----
From: "laura halliday" <marsgal42@hotmail.com>
To: <kaj.wiik@iki.fi>
Cc: <amsat-bb@AMSAT.Org>
Sent: Friday, 08 December 2000 23:12 UTC
Subject: Re: [amsat-bb] choice of IF frequencies


> Kaj Wiik <kwi@cc.hut.fi> wrote:
>
> >On Fri, 8 Dec 2000, laura halliday wrote:
> > > an image-reject mixer, in which case you can use any IF
> > > you want. Even baseband. All you need is enough image
> > > rejection to keep the image from killing the noise
> > > figure.
> >
> >Yes! See e.g.
> >http://www.hamradio.si/notune.html
>
> Yes, indeed.
>
> I have read Matjaz's papers with interest. He did a talk
> at the AMSAT symposium in San Diego and I appreciated
> both his design approach and his sense of humour. I'm
> not sure what it says when hams are building solid-
> state radios whose receiver topologies were carefully
> designed to minimize the number of vacuum tubes...
>
> This is a nice "universal IF" approach - convert every-
> thing to and from I/Q baseband. One oscillator per radio,
> no weird spurii.
>
> Laura Halliday VE7LDH     "Que les nuages soient notre
> Grid: CN89mg               pied a terre..."
>                                    - Hospital/Shafte
>
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