[amsat-bb] AO-85 SWL report II

Daniel Estévez daniel at destevez.net
Mon Nov 9 12:25:23 UTC 2015

El 09/11/15 a las 11:53, David escribió:

> Question: I understood that the uplink dificulties were related to some
> issues regarding 67Hz reception on the sat. If the COR mode doesnt
> handle 67Hz at all and is an "Open Squelch" mode... Should not "life be
> easier" to be repeated by the sat?.

Hi David,

When 67Hz detection is active, the satellite keeps the squelch open for
a minute after it loses the 67Hz tone. In my experience, usually the
satellite will keep its squelch open throughout all the pass or most of
the pass. The satellite will keep the squelch open even if 67Hz tone
detection keeps dropping all the time, as long as it detects the tone
for a couple of seconds often enough.

It seems that the problem is not that the sat doesn't open the squelch.
The squelch is opened but the satellite transmits only noise or a signal
which is too difficult to copy, because the satellite didn't hear the
uplink signal so well, but it's repeating it anyway.

That goes as far as I understand. Perhaps people in the Fox team will be
able to confirm or comment on this.



More information about the AMSAT-BB mailing list