[amsat-bb] Re: accidental satellite ops

kl7uw@acsalaska.net kl7uw at acsalaska.net
Thu Sep 17 12:52:00 PDT 2009


Actually, AO-7 was placed in the narrow-band (CW/SSB) subband back when it
was launched.  AS I recall a waiver was sought to do this.  So AO-7 is, in
fact, in the wrong frequency allocation for satellite operations.  Perhaps
Tom Clark or one of the other old hands that were involved when AO-7 was
built/launched can better state this (I was a member of sbms that built the
2.3 GHz transponder that was never allowed activation).

As far as attracting new satellite operators, there is an even chance since
the operator already is in possession of CW/SSB equipment that is required
for AO-7.  Basically, they would need proper antennas and learning about
tracking issues (times, freq. Doppler, etc.).  Also that the input is
inverted so one tranmits LSB to hear USB.  Most of the weak-signal group
(CW/SSB) are pretty savy bunch, so it remains whether it would interest

73, Ed - KL7UW

Original Message:
From: Glen Zook gzook at yahoo.com
Date: Thu, 17 Sep 2009 08:25:11 -0700 (PDT)
To: amsat-bb at amsat.org, sparkycivic at shaw.ca
Subject: [amsat-bb] Re: accidental satellite ops

The primary problem is that the OSCAR VII inputs are now in the weak signal
portions of the "band plans".  With the proliferation of FM activity the
weak signal portions have been compressed.  It is unrealistic to even think
of "blaming" the weak signal operators for interfering with OSCAR VII
operations.  Remember, OSCAR VII is 35 years old and was not expected to be
in service for more than just a few years.

One should just be happy that OSCAR VII is still usable and work around the
occasional situation with unintentional interference.  Besides, there are
not that many contests on the VHF and UHF bands and most of the time there
is little activity in the weak signal portions of 2-meters and 70 cm.

As for garnering additional satellite operators that is definitely a
possibility.  However, I don't know how many new operators would actually
be recruited.

Glen, K9STH
AMSAT 239 / LM 463

Website:  http://k9sth.com

--- On Wed, 9/16/09, Auke de Jong <sparkycivic at shaw.ca> wrote:

maybe the best one can do is to send QSL cards noting the
time/freq/sat/mode to the ops.  Of course this assumes that their callsign
can be understood


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