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Re: PSK tone interesting on AO-40



Hi Howard,

I think the frequency shift you're seeing is due to the magnetorquing.  If
you look at the navigation page you'll see the magnets were on.  Later in
the pass the shifting stopped suddenly so I suspect that is when the magnet
power was switched off.  Unfortunately the squint was bad so I don't have
any good blocks to confirm my theory.  Also if you are using AO40rcv you can
see the shift pattern on the frequency display to the right.  If you time
the peaks they match the spin rate reported by the IHU in the telemetry.

My first thought was wobble modulation but that wouldn't suddenly
start/stop.  Other theories are welcome or if I'm off base somewhere let me
know.

Lee-KU4OS

----- Original Message -----
From: "Howard Long" <howard@howardlong.com>
To: <amsat-bb@AMSAT.Org>
Sent: Tuesday, July 03, 2001 15:25 PM
Subject: [amsat-bb] PSK tone interesting on AO-40


> Sitting here in the shack listening to AO-40 (and watching the telemetry)
> tonight, the PSK tone seems to lower by a few tens of hertz for a couple
of
> seconds and then rise back again.
>
> I've never heard this before, but I'm sure someone will be able to
explain.
> Can't see anything obvious from the telemetry myself.
>
> I thought at first it was the down converter I was using, but I get the
same
> on my AR-5000 too.
>
> 73 Howard G6LVB
>
> ----
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