[amsat-bb] Re: AO-73 booming signal
Eric Knaps , ON4HF
on4hf at telenet.be
Mon May 5 13:54:01 PDT 2014
I listen daily to AO-73 to gather the telemetry data.
I use a 12 elements cross yagi and can switch between left CP or right CP.
At low elevations (between 0 and 10 degrees) I also suffer from deep
fadings where the signal is in the noise and then slowly coming back.
Amateur radio station ON4HF
Satellite manager UBA
Chris Thompson schreef op 5/05/2014 21:25:
> I've also heard a very strong downlink of my signal on a couple of
> occasions, but not had any replies. I am on the East Coast of the US in
> That said, I get very deep fades with AO-73. I think the antennae are in
> the x-y plane and are dipoles. They are therefore rotating as the
> satellite rotates about Z. If you are using an arrow antenna, or similar,
> then you get a deep null periodically and you can completely loose your
> signal if you are not careful. Does a CP antenna help with this? Can
> anyone using CP confirm?
> I understand AO-73 rotates about once a minute, or once every two minutes.
> So you should have a null every 30 seconds or so but it _seems_ worse than
> that and it's enough to throw you off, especially if you have struggled to
> find your signal in the narrow downlink in the first place.
> Then of course it goes into sunlight and your signal pops out of
> All in all, a tricky sat to work. I'm looking forward to my first contact
> through it.
> On Mon, May 5, 2014 at 2:18 PM, Paul Stoetzer <n8hm at arrl.net> wrote:
>> Agree. It isn't quite as loud or as easy to get a signal into as
>> VO-52, but it's very close.
>> I had a 70+ degree pass yesterday and my return signal was S8 with 500
>> mW to an Elk antenna. Unfortunately, all I heard were people trying to
>> find their signals until the end of the pass.
>> Looking forward to the FUNcube-2 payload on UKube-1 and the FUNcube-3
>> payload on QB50p2, apparently both launching June 19th, but I see
>> conflicting information about the DNEPR launch for QB50p1 and QB50p2
>> (with a FM transponder from AMSAT-F). Can anyone confirm that date?
>> Paul, N8HM
>> On Mon, May 5, 2014 at 12:52 PM, D. Craig Fox <DFox at rwglaw.com> wrote:
>>> I was on AO73 last night from southern Cal (DM13) at around 0555z,
>> calling many CQs. I kept my downlink at about 145.955. My sigs peaked at S9
>> (no preamp), 5 el fixed at 30 deg.
>>> AO73 was very loud. I had no replies and heard no one but myself. It
>> does take a little more work to keep up with the Doppler, but this is a
>> great sat and I encourage you to take advantage when the transponder is
>> turned on.
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