ARISSat over UK - 23.46utc Pass
UK Pass 23.46utc.
10dg Max elevation for the first UK pass but a fairly good signal received.
50% of an SSTV image plus two audio messages and the start of the audio tlm at the very end of the pass.
MET = IHU Temp = +27C Control Panel Temp = Battery Voltage = Battery Current =
Local QRM obliterating the CW/Telemetry frequency.
From the sound of the signal the satellite would appear to be tumbling
slowly.
David G8OQW
********
On 8/3/11 5:11 PM, David Barber wrote:
From the sound of the signal the satellite would appear to be tumbling
slowly.
Are there any deep nulls in the fading? If so, how long are they?
I designed the interleaving to tolerate deep fades of up to about 1-1.5 seconds as long as they don't occur more often than about once every 15 sec or so. Shorter fades can be tolerated more often.
Phil, KA9Q
Phil,
Using a vertically polarised beam here.
Deep double nulls.
Occurring approximately every 4 to 5 seconds.
Duration probably no more than 1.5 seconds.
I do have a wave file if you want it but it is 16mB in size.
David G8OQW
********
-----Original Message----- From: Phil Karn [mailto:karn@philkarn.net] Sent: 04 August 2011 01:27 To: david.barber@dbelectronics.co.uk Cc: amsat-bb@amsat.org Subject: Re: [amsat-bb] ARISSat over UK - 23.46utc Pass
On 8/3/11 5:11 PM, David Barber wrote:
From the sound of the signal the satellite would appear to be tumbling
slowly.
Are there any deep nulls in the fading? If so, how long are they?
I designed the interleaving to tolerate deep fades of up to about 1-1.5 seconds as long as they don't occur more often than about once every 15 sec or so. Shorter fades can be tolerated more often.
Phil, KA9Q
Hi Phil,
See my other post from earlier, some screenshots demonstrating the signal fading. They are hosted here:
Will have more comprehensive shots on the next pass (AOS in 31 mins from now)
At a quick estimate on the pass I saw (0.9 degree elevation) I would say a 2 second null then 6-7 seconds of good signal repeating.
73 Pete
2i0VAX
On Thu, Aug 4, 2011 at 1:27 AM, Phil Karn karn@philkarn.net wrote:
On 8/3/11 5:11 PM, David Barber wrote:
From the sound of the signal the satellite would appear to be tumbling
slowly.
Are there any deep nulls in the fading? If so, how long are they?
I designed the interleaving to tolerate deep fades of up to about 1-1.5 seconds as long as they don't occur more often than about once every 15 sec or so. Shorter fades can be tolerated more often.
Phil, KA9Q
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participants (3)
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David Barber -
P.H. -
Phil Karn