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www.southgatearc.org
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Tracking QRM - AO-51 repeater pairs return to normal configurationAMSAT-NA VP Operations, Drew KO4MA reported on behalf of the AO-51 Operations Team, "We are now back to the normal uplink arrangement of 145.920 and 435.300 for normal repeater use. "We changed from the QRM mitigation experiment of operating via the 145.880 uplink back to this normal mode to enable low-power repeater QRP operation. The QRP repeater is now operational on 145.880 and 435.150." As a result of the QRM investigation Drew said, "I'm convinced not all of our problems are related to the cordless phones. I heard tonight whistlers, blowing in the mike, and folks giving extended CQs. We are working on finding the general location of the cordless phones, but it takes time. Then we'll work at shutting them down. The AO-51 Operations Team provided results of their QRM investigation on and around the 145.920 uplink. There may be some low level modulation on some of the signals in the captured waterfall diagram. It is believed they may be from some of the same long distance phones that were plaguing AO-27 and SO-50 a few years ago. Observations indicate
the interfering signals are lost about the time the edge of the footprint crosses the mid Atlantic states. Refer to this page:
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