[amsat-bb] Re: SSB Operation on the Satellites

Tom Schaefer, NY4I ny4i at arrl.net
Thu Jun 9 11:06:03 PDT 2011

This is a great thread.

Well, I am going to continue with full doppler and just resolve myself to tuning in some people that are not quite there yet. As a lot, I would think adding computer control to handle full doppler would not be that big a deal nowadays as most of the programs support it. I am not telling you how to spend your money though. The big test will be at Field Day when I am using full doppler and listening to everyone do the doppler-shuffle. :)

See you on the air as W4TA from Field Day but NEVER on an FM bird. 


Tom Schaefer, NY4I
ny4i at arrl.net
Monitoring EchoLink node KJ4FEC-L 489389
DSTAR Capable  APRS: NY4I-15

On Jun 9, 2011, at 1:19 PM, David Palmer KB5WIA wrote:

> Jerry's correct.  If you only adjust your transmit frequency, such
> that your receive frequency appears to stay the same -- then you're
> automatically correcting for your own downlink doppler, but not for
> anyone elses.  Other hams in the footprint will still have to chase
> you.  The only way to stick with the "one true rule" is to adjust
> *both* uplink and downlink during the pass.
> That being said, adjusting the higher (UHF) transmit frequency on
> VO-52 and AO-07 only (ie. manual control) will get you pretty close,
> and you won't drift a whole lot.  I hear plenty of hams doing this, as
> long as there are just one or a two QSO's going on, they don't drift
> into each other very often.
> 73 de Dave KB5WIA / CM88
> SatPC32 with 2xFT817ND
> On Thu, Jun 9, 2011 at 7:35 AM,  <n0jy at lavabit.com> wrote:
>> OK my brain may be playing tricks, but if you vary only your transmit
>> frequency such that you always hear yourself on the same downlink
>> frequency, isn't it true that the other station may not necessarily be
>> hearing you on the same downlink frequency and is chasing you anyway?
>> Your doppler is +5kHz (for example) on the receive, the bird is just about
>> to pass overhead of me though so my receive ferquency goes rapidly from
>> +2kHz to -5kHz, your transmit tuning has no relation at all to what
>> frequency I am listening on.  Then the bird goes past you and you suddenly
>> switch down 5kHz, so I have to follow you on my receive.
>> Or am I nuts?  (Quite possible, come see where I work and you will
>> understand!)
>> Jerry
>>> I always varied the transmit.
>>> This way the person I'm talking to as well as any other listeners are
>>> all on the same freq listening.
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