Hi David and Ib,

Delfi transponder was operating over ZL on the 2132 UT pass a short while ago.

Started with a 6.3kHz offset (Satellite input on 435.5495MHz, Output on 145.9068MHz). This drifted down to about a 6kHz offset at the end of the pass.

Good beacon signals until Delfi was about 61 deg S when it sounded as though it was FMing and the note became rough for about 2 minutes.

Little or no signal back from the transponder.

It recovered before LOS a few minutes later.

Note that Delfi has been in full sun for more than half its orbit before it hits ZL and progressively loses the sun before going into eclipse South of ZL so the above may not represent what happens as Delfi comes out of eclipse in the Northern hemisphere.

All very interesting. Still no one to talk to in this part of the world. "Heard in VK" is the best so far. Next pass is 4 Deg low to West (over VK) so perhaps this time if the transponder is still on.

Alan

ZL2BX

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From: G0MRF@aol.com [mailto:G0MRF@aol.com] Sent: Monday, 28 July 2008 13:37 To: alancresswell@xtra.co.nz; oz1my@privat.dk Subject: Re: [amsat-bb] Re: Delfi C3 transponder frequencies ?

Hi Alan / Ib

I never thought I would say this.....but part of the answer is on you tube.

http://www.youtube.com/watch?v=vYcl48K5qBE

If you watch the video carefully, then you can see with a little stopping and starting the two frequencies on their radio when they were testing the transponder. It's about 1min 20sec into the video.

145.9005 = 435.5512

So that would seem consistent with Alan's observation and equating to a nominal clean room temperature. However, certainly seems to be that an offset has been there from the moment the transponder was finished.

Thanks

David

In a message dated 27/07/2008 20:27:18 GMT Standard Time, alancresswell@xtra.co.nz writes:

Hi all,

On the one good pass over ZL so far I had to use a +6kHz offset on my uplink to receive on the nominal downlink frequency. i.e. satellite input frequency of 535.556 (nominal 435.550) to hit the 145.900 satellite output frequency.

Alan ZL2BX