[amsat-bb] Polarization (attitude mostly)
rw3xl at ya.ru
Wed Jun 1 10:03:37 UTC 2016
I'm working via SO-50 with different two antenna(436CP42UG, one RHCP, one LHCP, single mast, single rotator), which connect to two different radio, which connect audio output to different headphones. Observation is - when signal is going to zero in one channel, other channel is going up to maximum level. For one pass situation changes 4-6 times.
01.06.2016, 12:00, "Daniel Cussen" <dan at post.com>:
>> I pushed back on that requirement
>> due to cost and availability issues, but went ahead and installed the
>> polarity switch on our CP antennas. With certainty I can tell you that at
>> random times it made a huge difference in downlink signal level.
> There was discussion on the ARISS OPs mailing list as to what to
> recommend to schools and what would give best "bang for buck" I am
> still not 100% convinced that a RHCP/LHCP switch is indeed necessary
> for ARISS contacts. The only way to confirm would be one station with
> both RHCP and LHCP both receiving at the exact same time and logging
> or recording the results. Most/all stations that have said the switch
> helped have not compared in real time not switching. Over time the ISS
> signal can vary wildly, in particular the solar panels can totally
> block the signal completely from time to time. There is a couple of
> stations with dual VHF circular systems (mostly ARISS tele-bridge
> ground stations) and I have asked them to help. Until we have real
> world comparisons at least in the case of the ISS, I am not sure a
> switch is needed. Can someone do tests to check?
> Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions expressed
> are solely those of the author, and do not reflect the official views of AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
С уважением, Игорь, RW3XL
More information about the AMSAT-BB