[amsat-bb] Recent AO-85 Observations
py5lf at falautomation.com.br
Wed Feb 17 22:52:56 UTC 2016
I agree about the spin rate , but the RX sensibility still are the same for
me , I mean , only wit more than 20W to get a good return.
The sat has just passed over here and the spin rate is about 5-7 seconds
more or less.
2016-02-17 12:13 GMT-02:00 Paul Stoetzer <n8hm at arrl.net>:
> I have observed the same. Over the past couple of months, on directly
> overhead or ascending passes to the east, I could never get in until
> about TCA using about 20 watts to an Arrow antenna. On overhead
> descending passes or to the west, I could not get in after TCA.
> Now, over the past few days, it's been much easier to work horizon to
> horizon, but the fading is much worse throughout the pass and I am
> constantly twisting to try to regain the downlink. Some times, neither
> polarity works.
> According to DK3WN's Illum program, AO-85 will be in constant sunlight
> until 2/25. We'll see if it returns to it's previous patterns after
> Paul, N8HM
> On Wed, Feb 17, 2016 at 9:08 AM, Clayton W5PFG <w5pfg at amsat.org> wrote:
> > For the past several days, I have observed the following:
> > - On ascending passes, I can activate the transponder at AOS very easily.
> > Either polarity V or H works.
> > - Previously, I needed 10-15 degrees at times on ascending passes to
> > activate the transponder. As I approached TCA, the challenge getting in
> > always went away and I could get into the transponder easily.
> > - Descending passes have never been an issue for me. I could access the
> > transponder at AOS and activate the transponder as low as 0.1 degrees
> > elevation.
> > - Downlink receive polarity seems to flip almost constantly or be equal
> > times. I'm running a V or H antenna configuration (not RHCP or LHCP.)
> > - Suspected reason is the spacecraft's spin rate has changed with it now
> > constant sun.
> > - As a result I'm hearing some newer stations working AO-85 with handheld
> > transceivers. I've worked 2 new stations in the last 2 days who emailed
> > directly after the pass stating they were seeing some success with an HT.
> > Thoughts/comments?
> > 73
> > Clayton
> > W5PFG
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