Drew, the only difference I detected in the 0029 utc pass over Western US was the polarity changes. Almost thought
I was on SO-50 instead of AO-51. Had to keep the hand on the reversal switch. Heard acouple of other comments about it too during the pass. Signal strength here on the West Coast seemed to be the same as before.
To all AMSAT-Florida net participants:
Recently, the KG4YZY repeater that provided the Echolink connection into
the wide area NI4CE repeater system was permanently disconnected from
the network, and temporarily removed from service. As the AMSAT-Florida
net relied on that Echolink connection as the hub for all our
participating repeaters from Miami to Gainesville, as well as worldwide
individual participants, we are left in quite a jam until we reestablish
a hub system.
Further complicating the situation is that the three active net control
stations rely on being able to use a real RF connection to run the net,
assisted by Echolink in the background.
For tonight's net I propose that Echolink users connect to K4ZPZ-R 44310
in Orlando, 443.100 on RF. Our Orlando NCS is unavailable tonight, so
depending on conditions I will attempt to be NCS either via RF or
Echolink. This might get very "interesting", and the net will likely be
more informal than usual. We can reevaluate and reintegrate NI4CE when
they restore Echolink connectivity. What I do not think should happen is
the net splitting into two entities. That, IMO, is a recipe for failure
So, please join us on K4ZPZ-R tonight for the AMSAT-Florida net,
Echolink node # 44310, RF 443.100 MHz.
73, Drew KO4MA
On the 2242UTC pass of AO-51 tonight, we will try for the first time to
reverse the magnet and "flip" the orientation of the satellite. While we
do this, the 435.300 transmitter will be shut off for about 10 minutes.
If the reversal is successful, we should see some changes in signal
levels and patterns. This particular maneuver has not attempted since
I'd appreciate any signal reports or observations from this evening and
the next few days be emailed to ao51-modes(a)amsat.org or ko4ma(a)amsat.org.
In related news, as the spacecraft spin inexplicably continues to slow,
we are seeing increasingly larger dips in the spacecraft voltage when
the panels are poorly aligned to the sun. The immediate result of this
is that we have had to decrease the power on both transmitters to
prevent discharging the batteries too deeply. We'll be working on
mitigating strategies this coming month. This may include using existing
software routines to automatically lower the downlink power during these
dips in power production, or resolving to run one transmitter at a time
instead of simultaneous digital and repeater downlinks.
73, Drew KO4MA
AMSAT-NA VP Operations
I worked Ao-51 this morning, and I had a contact with EI8JB portable
during 07,33 utc orbit.
For me nothing changed, I received from Ao-51 the same strong signal
My downlink set-up : 738xb cross yagi antenna 38 elements cross yagi sp-7000
My locator JN54IL
I received repeater transponder s.9+20 on RHCP polarization
I received telemetry s.9 on LHCP polarization
Transceiver TS 790E
(only a little bit qsb on both transponder, but normal for me)
Ao-51 range = 2650 Km.
Max. elevation 8°
Thank you to you and all commander team for your effort,
to keep Ao-51 ever on a good shape.
Da: amsat-bb-bounces(a)amsat.org [mailto:[email protected]] Per conto di
Inviato: giovedì 3 dicembre 2009 0.03
Oggetto: [amsat-bb] Re: AO-51 magnet reversal tonight
The commands were executed to reverse the magnet, and there did seem to
be a change in signal strength by the end of the pass. I'm particularly
interested in any signal reports from the Southern Hemisphere. Does
AO-51 sound stronger than normal?
73, Drew KO4MA
AMSAT-NA VP Operations
Sent via AMSAT-BB(a)amsat.org. Opinions expressed are those of the author.
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After the hamfest on Saturday (5 December) morning, I plan on
spending the afternoon somewhere in the rarely-heard grid DM32
south of Phoenix. I may park on the DM32/DM42 grid boundary,
but definitely somewhere in the rarely-heard grid DM32, for a
AO-27: 2100-2107 and 2240-2247 UTC
AO-51: 0004-0018 and (possibly) 0144-0156 UTC
It has been a few months since I last operated from DM32, and
this was one of the grids I saw listed in response to my
request for Arizona grids that satellite operators wanted for
their logs. If you work WD9EWK on Saturday afternoon and want
a QSL card for QSOs from DM32, please e-mail me the QSO details.
If you're in the log, I'll be happy to send a QSL card. No
I will have an AMSAT table at the Superstition Amateur Radio
Club's annual hamfest in Mesa, Arizona, on Saturday 5 December
2009. The hamfest will be in the southwest parking lot at Mesa
Community College, along the east side of Dobson Road between
Southern Avenue and the US-60 freeway (exit 177) in grid DM43bj.
The hamfest starts at 0600 local time (1300 UTC) and officially
runs until 1400 local time - although this hamfest typically shuts
down between 1100 and 1200 local time. More information about the
hamfest is available at:
During the hamfest, WD9EWK will be on several satellite passes
AO-51: 1254-1309 and 1434-1447 UTC
AO- 7: 1448-1510 UTC
VO-52: 1618-1630 and 1754-1806 UTC
SO-50: 1730-1742 UTC
On AO-7, look for me around 145.960-145.965 MHz USB. On the
VO-52 passes, look for me around 145.910-145.915 MHz USB.
Don't worry, these satellites work fine away from the center
of the passband. :-)
Satellite demonstrations using both FM and SSB have been great
for attracting crowds for demonstrations at other hamfests in
the past year. At some hamfests, VO-52 passes would attract
the largest crowds. Using a pair of FT-817NDs with a handheld
antenna, working the satellite at 5W, and not relying on computer
control of radios or antennas helps to dispel the myths about how
complex non-FM satellite operation has to be.
I hope to hear many of you on these passes Saturday morning.
If anyone working WD9EWK would like a QSL for contacts during
these demonstrations, please e-mail me directly with the QSO
details. If you're in the log, I'll gladly mail you a QSL card.
I will be doing a satellite demo on S0-50 tomorrow night from Memphis
for our current Tech. class. It will be on the Dec. 4th - 0250utc pass.
I would appreciate a few contacts to show them how easy it is to work
the "birds" with an HT and handheld antenna.
Thanks in advance,
Rick - WA4NVM
Well, just got through listening to a pass of AO-51. As several have
suggested, it was a pointing issue with the antenna.
I can't believe my memory has gotten to the point where I couldn't
remember where North was the last time I had the antennas up.
Thing is, I actually took a compass reading the other day and
compensated for declination but I must have misread something
somewhere. I was only about 20 degrees off! Declination here is only 4
degrees so it couldn't have been that. That's what I get for working on
stuff at dusk I guess. I'm slightly embarrassed!
BTW, I didn't mean to make anyone think that an 11 element yagi was
too narrow for LEO's. It's fine if you point the dang thing right!
Also, the reason why I went this route with the more complex antenna and
AZ/EL system is that I already had the stuff on hand from my last foray
into satellites. Only the preamp was new and I knew that everything had
worked before. I can certainly appreciate the suggestions on
simplification and I was about to do just that if I didn't have any
Now I just have to work out some of my cable issues and get something
going for transmit. My 2 meter "cheap yagi" has seen better days. Once I
get that, I'll raise the mast and get the antennas up to their normal
I'm just using HT's right now but I hope to have a new TS-2000X
sometime after the first of the year. I've been quite interested in the
TS-2000 vs. IC910H thread. I know that Icom has discontinued the 910
because of the 9100 but I was under the impression that Kenwood would
release a new rig at Dayton this year and wonder if that will mean the
demise of the TS-2000.
Thanks everyone for the suggestions and also allowing me to "vent" a
bit last night.I was getting pretty frustrated.