[amsat-bb] AO-51 power levels
gouldsmi at bellsouth.net
Thu Jun 25 19:25:33 PDT 2009
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.
----- Original Message -----
From: <n3tl at bellsouth.net>
To: "Jeff Yanko" <wb3jfs at cox.net>; <amsat-bb at 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 at 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
>> Jeff WB3JFS
>> Las Vegas, NV
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