[amsat-bb] Re: AO-51 still cannot access

Scott oz2aba at amsat.org
Mon Mar 14 13:07:57 PDT 2011

Hi Enso,

The OZ7SAT system is set to use 1268.705 MHz for the uplink. The actual
frequency will vary a little bit due to temperature variations (the radio
and transverter is located outdoors) but this does not seem to have a big
impact on the uplink.
We have adjusted the modulation so the resulting signal is slightly narrower
than expected. This appears to help a little.
Our uplink antenna is a WIMO 23-cm helix and I think we feed it with some
40-50 W.

The uplink success rate do varies a lot. On some passes we can't get in
despite 30 degrees elevation. At other times we manage to get in while the
satellite is only 3 degrees over the horizon.

OZ7SAT is a club station and you can mail us on oz7sat at amsat.org. You can
see which satellites we are tracking on http://www.amsat.dk/oz7sat (the
first page is mostly in Danish).

The pass at 14:19-14:33 UTC today was a good pass. We received 2195 frames
from AO-51. That's was almost half a megabyte.

73 de Scott / oz2aba

PS: Glad to see that we are not the only ones listening to satellite packet
here in Europe. We almost never see other callsigns in the queue.

-----Original Message-----
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
Behalf Of Vincenzo Mone
Sent: 14. marts 2011 18:30
To: amsat-bb at amsat.org
Subject: [amsat-bb] AO-51 still cannot access

Today at about 15:00 pm i had a good pass of AO-51 but as usual i could'nt
get in.
I've tried during the whole pass to tx on the uplink frequencies moving a
bit up and down but nothing to do, i did not get any response.
I have tried with two TNC with a TINY-2 and with a TNC3S but had the same
I saw in the queue for the whole pass OZ7SAT.
I would like to know which is the correct frequency to TX.
Unfortunately i do not know and also cannot find OZ7SAT's email address so
if he read this message can please email me the correct frequency.
Any help will be really appreciated.
73's de Enzo IK8OZV

Inviato da iPhone
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