[amsat-bb] AO-7 Report

Paul Stoetzer n8hm at arrl.net
Fri May 30 23:14:49 UTC 2014

WC7V confirmed to me that AO-7 was in Mode A after the Mode B transponder
shut off.

This likely means that my theory of a power drain causing the satellite to
automatically switch into Mode D is incorrect and this is just a
manifestation of the random mode switching that has been a part of AO-7's
"character" for the past 39+ years.

One of the likely causes of random mode jumping, however, is an excessive
power drain caused by too much power on the uplink. Please limit your
uplink power to no more than 100w ERP. As stated numerous times over the
past 39 years, if you cannot hear your downlink on AO-7 Mode B with 100w
ERP, you need a better receive system, not more power!


Paul, N8HM

On Fri, May 30, 2014 at 5:29 PM, Richard Lawn <rjlawn at gmail.com> wrote:

> Was just about to enjoy a CW QSO with PV8DX on AO-7 and everything
> disappeared. Has it been acting up lately or is it me?
> Rick
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