Re: [amsat-bb] choice of IF frequencies

["John Stephensen, KD6OZH" <kd6ozh@xxxxxxx>]

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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