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RE: AO-51 contacts and QSL info.

Hi Ernest,
	I find that even ďhigh powerĒ stations have problems being ďstompedĒ by
other operators on AO51. Itís my opinion that the problem isnít the amount
of power being run, but the fact that many operators are trying to run
half-duplex and arenít able to hear the downlink while transmitting. Itís
common to hear stations calling over existing QSOís and never acknowledging
the stations that attempt to answer them. Itís also common to have stations
calling off frequency enough that they are un-intelligible but near enough
to lock the PL and make the satellite un-useable to other operators. Both
these problems result when the offending operator isnít able to hear the
downlink while transmitting and as a result has no idea if he/she is
actually accessing the satellite. Even operators that do manage to make QSOí
s while running half-duplex often transmit over other operators because they
simply canít hear them. Add this to the somewhat crowded conditions on a
single channel satellite and the resulting confusion multiplies the problem.
	I operate both base and portable with an arrow antenna and a handheld
(full-duplex) and my impression is the problems arenít much worse for the
portable stations than for the base.
	I donít have a solution to the problem, just my observations.
Steve .. AI7W
Lm #2270

-----Original Message-----
From: owner-AMSAT-BB@amsat.org [mailto:owner-AMSAT-BB@amsat.org]On
Behalf Of NCC-1701E
Sent: Saturday, April 30, 2005 06:52 UTC
To: amsat-bb@amsat.org
Subject: [amsat-bb] AO-51 contacts and QSL info.

Dear members:
As I read the info on the Echo site, It has come time to say a few words
about all the high powered stations accessing AO-51 and stomping the
daylights out of the HT users.

I was hoping there would be some form of "gentlemen's" agreement on high
power to access this particular bird, but since I have been using this
particular bird during its pass over my location, I find it very difficult
to get my call in over the others running signals well in excess of 5
watts(plus ant. gain) that I and many users operate with.

50+ watts ERP or greater in my view, is not keeping with the 'spirit' of low
powered use of this satellite, and it makes it almost impossible to make a
QSO with a station that is 6 degrees above the northern horizon while a big
gun is calling from 6 degrees on the southern horizon and still
blowing me out of the water so I can't hear this northern contact return my

It's not rude, but it is frustrating at times to be working a VE6 and
hearing him/her getting stomped by a W4 that is close to LOS and yet 'we'
can not complete the contact due to this form of QRM.

I know I am a small time operator, and I am not writing this to appear as a
n argument of sorts, just an informative note to kindly request all users to
run as close to the HT level as originally intended so all users have equal
oportunity to make good contacts, and not have to do the HF style hunt and
pounce routine on 20 meters during a contest.
I'm not an AMSAT member yet, but will be very soon though.