[amsat-bb] Re: AO-73 booming signal

[Greg Dolkas]

Yes, CP antennas definitely help, both on the up and down links.  In my experience it doesn't matter much which direction (left or right hand), just that they're circular.  Both of mine are, and I found the satellite's signal to be really consistant across the pass.

Greg. KO6TH


On May 5, 2014 12:25:54 PM PDT, Chris Thompson <chrisethompson at gmail.com> wrote:
>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
>Brooklyn.
>
>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
>existence....
>
>All in all, a tricky sat to work. I'm looking forward to my first
>contact
>through it.
>
>73
>Chris
>ac2cz
>
>
>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?
>>
>> 73,
>>
>> 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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>
>
>
>-- 
>Chris E. Thompson
>chrisethompson at gmail.com
>g0kla at arrl.net
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