[amsat-bb] Re: Doppler Tuning Convention Question

Gary "Joe" Mayfield gary_mayfield at hotmail.com
Tue Jun 1 20:38:46 PDT 2010

The one TRUE method is do whatever it takes to make the QSO!

In reality I almost always wind up tuning both up and down links.  I make
sure most of the adjusting is on the higher frequency.

I can't say I have ever slid into another QSO, but even if I do, it is just
an opportunity to speak with more friends I haven't met yet!  I am usually
very hard pressed to find more than one or two QSOs in the passband anyway.

As I mentioned before I have found computer tuning to work just fine on the
FM birds (no slop involved), but always find myself fighting against the
computer aided linear tuning.  I tune the station in perfectly and then the
computer moves me off frequency.  I tune the station in again and the
computer moves me off frequency again.  I turn the computer tuning off and
make the QSO.

I would be game for some pointers as I would like to at least claim I have
made this work once.

Joe kk0sd

-----Original Message-----
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
Behalf Of Alan
Sent: Tuesday, June 01, 2010 8:32 AM
To: amsat-bb at amsat.org
Subject: [amsat-bb] Re: Doppler Tuning Convention Question

Folks I've been patiently silent reading this déjà vu annual discussion and
I'm getting a brain crap.

- comments that tuning the highest frequency is the "One True Method"
Yikes! Why is that?  So you can leap frog down the pass band and eventually
stomp all over a QSO where folks are tuning both TX and RX to maintain a
single constant frequency at the satellite?

I've read the " Doppler tends to move more quickly near mid-pass than the
computer and software routinely seem able to keep up".  Mid pass is when the
sat is moving most tangentially to you at which point Doppler shift is nil.

I've read statements from many taking pride in their lack of use of current

I've read that working tight SSB sats is easier than the wide band FM where
the satellite is very forgiving of your sloppy tuning. 

I've read advise to someone using an FT 736r that your shouldn't tune the RX
and ignore the use of the NOR/REV feature, again so you can eventually stomp
on other QSO's as you slide down the pass band.

Have I just been transported into a Bizarro World?

73, Alan VE4YZ
AMSAT LM 2352 
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