[amsat-bb] Uplink Doppler Changes For FM Satellites

[John Brier]

The AFC was discussed in the past.

Best point made IMHO that you should compensate for Doppler is that if a
lot of people are uplinking, the receiver at bird is going to be more
likely to receive properly compensated signals.

73, John Brier KG4AKV

On Wed, May 13, 2020, 15:13 Peter Goodhall (2M0SQL) via AMSAT-BB <
amsat-bb at amsat.org> wrote:

> Confused why you think Huskysat-1, DOSAAF-85 (RS-44), CAS-7A  are FM
> sats they are all linear so please don't be putting any FM through
> them.
>
> Current FM fleet is AO-91, AO-92, SO-50, Lilacsat-2 and PO-101 nothing
> else.
>
> You still need to put Doppler correction into the memories on AO-91
> and AO-92 not sure why you wouldn't be there are so many charts
> available just to transpose into the memory software.
>
> Peter, 2M0SQL
>
> On Wed, 13 May 2020 at 19:52, Tim Crawford via AMSAT-BB
> <amsat-bb at amsat.org> wrote:
> >
> > Uplink Doppler Changes For FM Satellites Question.  I am updating my HH
> Freq currently.
> >
> > As I under stand it, the Fox Satellites (AO-91 & 92) receiver have AFC
> (automatic Frequency Control) which means that no doppler change in the
> transmit frequency is required nor should it be put into effect.
> > My question is does anyone know whether or not any of the following FM
> Satellites also have AFC for their receivers?
> >
> > PO-101 (Diwata)CAS-3H (LilacSat-2)Huskysat-1DOSAAF-85 (RS-44)CAS-7A (not
> launched  yet)
> > Thank you for your assistance.
> > 73
> > Tim CrawfordKE7TAC
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