Well stated Paul! Additionally, I fear some users just turn up the power to overcome a poor receive system.
73, Drew KO4MA Sent from my iPhone > On Apr 25, 2014, at 8:23 PM, Paul Stoetzer <[email protected]> wrote: > > Absolutely! > > The recommendation at the time of launch was to limit power output to no > more than 100W ERP (which is about 25 watts to a small antenna like an Elk > or an Arrow). This is even more critical now since the solar panels are > almost certainly not supplying enough power to drive the transmitter to > it's full power output. At certain times of the year, there are poor solar > angles on the panels too, which reduces power availability. Remember too > that AO-7 will enter a period where it eclipses on every orbit over the > south pole within the next week or so. That period will last for about 9 > weeks. It should be in Mode B every day as a result, but from what I've > read about past eclipse cycles, it can act a bit odd during that time. > > On too many passes, I hear distorted audio and reflections throughout the > transponder from it being hit too hard with SSB and especially CW. CW, > being full power at key down, unlike SSB, is even harder on a linear > transponder. > > If everyone would just have the courtesy to keep their uplink power to a > reasonable level, AO-7 can be a very enjoyable satellite with a large > footprint providing the best DX opportunities currently available. > Unfortunately, this problem is not new as a glance at the AMSAT Newsletters > from 1974-1981 shows. > > I recommend the following reading: The Editorial + Letter from W4NUL/5 in > the March 1976 AMSAT Newsletter, the AMSAT-OSCAR-7 QRP Test Telemetry > Report in the November 1976 AMSAT Newsletter, and the June 1976 QRP Test > Results from the December 1976 AMSAT Newsletter. All available here: > http://www.ka9q.net/AMSAT-Newsletter-1976.pdf > > Please calculate your ERP ( http://www.csgnetwork.com/antennaecalc.html ) > and keep it to no more than 100W. > > 73, > > Paul Stoetzer, N8HM > Washington, DC > > >> On Fri, Apr 25, 2014 at 11:12 AM, Dave Webb KB1PVH <[email protected]> wrote: >> >> Only when people are running too much power. It's called FM'ing. >> >> Dave-KB1PVH >> >> Sent from my Verizon Wireless Droid RAZR >>> On Apr 25, 2014 11:10 AM, "Peter Wilson" <[email protected]> wrote: >>> >>> Just worked IK8YSS on AO-07. >>> >>> >>> >>> Haven't worked this satellite for a while and whilst I know the bird is >>> very >>> old, the audio on this pass was very distorted. >>> >>> >>> >>> Is this common? >>> >>> >>> >>> Peter >>> >>> G8KEK >>> >>> _______________________________________________ >>> Sent via [email protected]. Opinions expressed are those of the author. >>> Not an AMSAT-NA member? Join now to support the amateur satellite >> program! >>> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb >> _______________________________________________ >> Sent via [email protected]. Opinions expressed are those of the author. >> Not an AMSAT-NA member? Join now to support the amateur satellite program! >> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb > _______________________________________________ > Sent via [email protected]. Opinions expressed are those of the author. > Not an AMSAT-NA member? Join now to support the amateur satellite program! > Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb _______________________________________________ Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
