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AO-51 doppler


#1

Here is how you can program transceiver for coming AO-51 passes to compensate approximatively for Doppler shift

CH/RX/TX
20 435306 145918 AOS
21 435303 145919
22 435300 145920 mid pass
23 435297 145921
24 435294 145922 LOS

Greater values are probably not needed since the satellite is then just above horizon.

73, Jaakko OH7BF/F5VGL


#2

In reply to OH7BF:
Any luck, Jaakko?

73

Brian G8ADD


#3

In reply to G8ADD:

The first pass 1248 UTC was E-NE-NW with maximum elevation of 24 degree. FT817ND and folded dipole started to pick up the AO-51 around 1250 UTC from East. The dipole was fixed on my Leki pole. I rotated the dipole and adjusted the elevation angle to maximize the signal. The Russian stations were loud and clear, but this is not surprise since they are so close here. I was giving my call sign hoping that somebody would hear it and reply. Then I tried to reply to OH7FES, but no success. The 1425 UTC pass was similar, but with maximum elevation of 52 degree. Finally 1604 UTC AO-51 was West from me, I could hear Norway, Germany and Croatia. The heard signals were so strong that in more quiet conditions two way QSO should be possible. Unfortunately on these repeater type satellites the whole EU is sharing the same frequency at same time.

73, Jaakko OH7BF/F5VGL


#4

In reply to OH7BF:

I will test again AO-51 portable operation on 31/12/2008 with USB/CW up and FM down mode in some of the passes 0558 UTC, 0737 UTC, 1406 UTC, 1544 UTC and 1724 UTC. January 1 only CW mode should be used due to SKN. The frequencies are 435150 down (+10 kHz initial Doppler) and 145880 up (-3 kHz initial Doppler).

73, Jaakko OH7BF/F5VGL