[amsat-bb] Re: Doppler Tuning Convention Question

Tim - N3TL n3tl at bellsouth.net
Tue Jun 1 05:40:31 PDT 2010


Thanks for this reply. It's nice to know that even the highest of currently-in-use satellite frequencies are do-able without computer aid. I'm pleased to hear that, and will rethink my position on things above 70 cm.

To Joe and Bruce - Here, I have noticed particular challenges with VO-52, whose Doppler tends to move more quickly near mid-pass than the computer and software routinely seem able to keep up with. The Mode J satellites and AO-7 Mode B haven't really been too troublesome. At the end of the day, however, tuning manually remains a very viable option for any of us, in my opinion. 

73 to all,

Tim - N3TL

From: Greg D. <ko6th_greg at hotmail.com>
To: n3tl at bellsouth.net; apbiddle at mailaps.org; jbelstner at yahoo.com; amsat-bb at amsat.org
Sent: Tue, June 1, 2010 12:36:55 AM
Subject: [amsat-bb] Re: Doppler Tuning Convention Question

> From: n3tl at bellsouth.net
> To: APBIDDLE at mailaps.org; jbelstner at yahoo.com; amsat-bb at amsat.org
> Date: Mon, 31 May 2010 21:42:09 -0400
> Subject: [amsat-bb] Re: Doppler Tuning Convention Question

> Alan, I have no doubt that you're right about the necessity for Doppler
> control above Mode B satellites. Having always preferred the KISS approach
> whenever possible, I suppose that's why I haven't been able to get myself
> very excited for L- and S-band opportunities. I definitely enjoy the
> benefits of computer control for Doppler. I just don't much care for having
> no choice in using it (or not) to effectively work a satellite.
> 73 to all,
> Tim - N3TL

Actually, I've been running 2.4 ghz manually since AO-40, and really haven't had that much trouble.  Just keep spinning the dial.  Also, having an older rig (736r), I don't bother with computer control when on the linear birds.  I do relax under full computer control for FM up through L-band, but there's still something satisfying about manual tuning.

Greg  KO6TH

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