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

[Eric Knaps , ON4HF]

Hello Chris.

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.

73,
Eric.

Amateur radio station ON4HF
Satellite manager UBA
Member Amsat-UK
Member Amsat-ON

Eric Knaps
Waterstraat 30
B-3980 Tessenderlo
Belgium

http://www.on4hf.be

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
> 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.
>>>
>>>
>>> NOTICE: This communication may contain privileged or other confidential
>> information. If you are not the intended recipient of this communication,
>> or an employee or agent responsible for delivering this communication to
>> the intended recipient, please advise the sender by reply email and
>> immediately delete the message and any attachments without copying or
>> disclosing the contents. Thank you.
>>> _______________________________________________
>>> Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
>>> Not an AMSAT-NA member? Join now to support the amateur satellite
>> program!
>>> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>> _______________________________________________
>> Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
>> Not an AMSAT-NA member? Join now to support the amateur satellite program!
>> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>>
>
>


---
Dit e-mailbericht bevat geen virussen en malware omdat avast! Antivirus-bescherming actief is.
http://www.avast.com