[amsat-bb] Making the transponder sats as easy as the fm birds

[Pedro Converso]

Hello,

Regarding Dopplers, http://amsat.org.ar/pass implements 4 select-able ways
to follow Dopplers:

1) Both Uplink and Downlink Dopplers correction
2) Keep Uplink steady and modify Downlink
3) Keep Downlink steady and modify Uplink
4) Keep both Dopplers steady (No control)

1) Result: both stations QSOs like an HF SSB QSO (free hands, no tunning).
3) Result: for receiving station signal always on same frequency.

These can be applied either manually or thru CAT.

Thus allowing freedom of choice which way users prefer.

Appreciate and thanks users had suggested to implement these alternatives.

73, LU7ABF, Pedro

On Sat, Apr 14, 2018 at 1:43 PM, Vince Fiscus, KB7ADL <vlfiscus at mcn.net>
wrote:

> At 12:29 PM 4/14/2018 +0000, Paul Stoetzer <n8hm at arrl.net>wrote:
>
>> The general guidance in the early years of operating linear transponders
>> was to adjust your transmitter to maintain a constant receive frequency.
>> Experience with the Mode J transponder on FO-12 caused the gudiance to be
>> updated to tuning the higher of the two frequencies. See the Sept 14, 1987
>> Amateur Satellite Report for more details (
>> http://www.ka9q.net/asr-1987.pdf).
>>
>
>
> I've always tended to adjust the uplink to the satellite, even
> on mode J.  Never been chewed out for doing it that way though.
>
> My question,  for OM's doing computer control of their rigs. Is the
> software following the rule, or is it adjusting both uplink and
> downlink simultaneously?
>
> I've always been curious about that.
>
> Still using InstantTrack here.  :-)
>
> KB7ADL
>
>
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