I will be on the 03:20Z AO-73 pass that covers much of North America
this evening. Last night was fun! Hope to hear a few people on the
I will call CQ at around 145.965 MHz.
The satellite will enter sunlight at 03:27:45 and the transponder will
Paul Stoetzer, N8HM
If you can make a flight ready amateur payload with some kind of
educational association in the next 3 months, there is a ride. You get a
temperature controlled 0-60C flat plate about 4" by 7" and 28v power on the
outside of a large free-flyer. The bad news is that the mission is low LEO
so maybe only a life time of 3 or 4 months.
Riding back from the smallsat conference to the airport in the shuttle one
of the passengers asked If I wanted to fly an APRS payload. I said sure.
THen he said "do you know anyone else too?" Need to involve "students" is
I apologize that I dont have any of your prior emails (Im transiting
airports for the next 14 hours and wont have access to old emails for 2
more days, but didnt want to wast any time. I hate to spin people up like
this, and it may take a week for me to get official details, and it may
only be a pipe dream, but thought I would share it.
Your box will be attached to their plate, and your other side is exposed to
space. They will provide another 28v to burn any release mechanisims for
your antennas. Assume one edge of your box can be close to a spacecraft
edge so your antenna can come out and hang over an edge. Or your box can
be a few inches high and can deploy its antenna "up" from the plate and
then you have more mounting options. Whether you are on the top, bottom,
or side of the mother ship is still open. Spacecraft is well powered and 3
Serious builders with space experience ONLY. I gotta not only build mine,
but also finish two others and should not be wasting time with emails.
AND you have to have your IARU frequency coordination and FCC paperwork
But power, a platform, an attitude, some temperature control, quick
attachment, and a ride are hard to pass up.
Thanks for the operating tips Paul as I have not been very successful in
the past with this bird. Perhaps I'll try again tonight from my lakeside
qth in FN21. I've noticed that sigs are very strong but I've always had
trouble finding myself. I'll try your approach.
If true, this would provide the first SDR with output on 6 Meters, 2
Meters, 222, 432, and 1.2 GHz. This would be a real game-changer for VHF
weak signal operators, and provide enough drive for most amps. Can't
wait to learn more about this product.
Les Rayburn, N1LF
121 Mayfair Park
Maylene, AL 35114
6M VUCC #1712
Grid Bandits #222
Southeastern VHF Society
Central States VHF Society Life Member
Six Club #2484
Active on 6 Meters thru 1296, 10GHz & Light
I will be on AO-73 tonight at around 02:58Z, calling CQ at around
145.965 MHz. These passes usually don't have much, if any, activity
and I'd like to drum up a bit more.
The satellite will enter sunlight at 03:05:45, giving about 7 minutes
of transponder time here in Washington, DC. I will be operating off a
south facing balcony, so I will probably lose the satellite about 30
seconds before the transponder shuts off.
Tips for working AO-73:
-Do not use computer control, the transponder frequencies are not
stable and this will only result in frustration. Besides, manual
Doppler control is much more fun than letting the computer do all the
-I usually start a pass by trying to find myself come into the top
edge of the passband (145.970 MHz). To do this, I usually start
transmitting around 435.130 MHz and tuning up slowly until I can hear
myself enter the passband. Then I can move around the transponder
easily. Remember to tune your uplink to maintain an constant downlink
frequency (the opposite of FO-29).
-Keep power output down. The transponder has a very sensitive receiver
and a very active AGC circuit. Excessive uplink power will not make
your signal louder - it will only reduce that available for others on
the transponder. With a clear view of the horizon, 5 watts to an Arrow
or Elk is plenty for horizon to horizon coverage. Very slightly more
might be necessary if you are beaming through trees or other
obstructions, but try to keep power to 25-40 watts ERP.
Hope to hear you on this evening!
Paul Stoetzer, N8HM
The Perseid meteor shower peak is predicted to occur between August 11
to 13. There are a few pre-peak pings already audible. The activity
should increase over the next several days.
Web streaming of the Perseid is on-line at:
Quoting from their web page here is how they do it now:
The US Air Force Space Surveillance Radar has been shut down, but
we're still recording meteor echoes. How do we do it? Radio engineer
Stan Nelson uses a Yagi antenna in New Mexico to detect 54 MHz TV
signals reflected from meteor trails. When a meteor passes over his
observatory--ping!--there is an echo.
73 de JoAnne K9JKM
Editor, AMSAT Journal