I am still trying to tweak the power levels to get through all the eclipes during the day.
Tonight I changed TXA (L/U) to 210 mW and TXB (V/U) to 290 (as low as I can get it without turning it off). The eclipse I measured on one pass tonight was 16:05 minutes +- 5 sec. The eclipse time should start to decrease over the next few days.
73, Gould, WA4SXM ----- Original Message ----- From: n3tl@bellsouth.net To: "Jeff Yanko" wb3jfs@cox.net; amsat-bb@amsat.org Sent: Thursday, June 25, 2009 9:45 PM Subject: [amsat-bb] Re: AO-51
If I recall correctly from a post last week, the U/V pair is operating at roughly 290 milliwatts RF out on transmit, and the L/U pair is at roughly 260 mW. In other words, each transmitter is operating on slightly more than SO-50 (250 mW) power levels.
I have had passes this week where the satellite was armchair copy on one pass, and about like has been described this evening on another. I suspect the lower power levels (half or less of what has been nominal for most of the past year) and the inevitable mismatch (depending on the angle between the satellite and a given ground station) of its circular-polarized antennas to many ground stations' linear-polarized antennas are contributing to the reception differences.
Drew (KO4MA) or Gould (WA4SXM) can comment - and I hope they will if this is incorrect - but I suspect that AO-51 continues to operate as it has recently. I appreciate very much their efforts to maintain the satellite. That being said, it will definitely prove to be a challenge to work for many Field Day stations.
I hope I can get the one contact on it that I can count for the club FD effort I'll be a part of. And I hope that other stations will make their one allowed contact and give other stations the same chance to get theirs.
Best of Field Day luck and 73 to all,
Tim - N3TL -------------- Original message from "Jeff Yanko" wb3jfs@cox.net: --------------
Wondering if AO-51 is operating? Just listened for the 2357z pass and nothing received. The last time I checked the status of the bird it shows that the 435.300 downlink was active. I also listened for the 435.150 to no avail.
73,
Jeff WB3JFS Las Vegas, NV DM26
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