[amsat-bb] Polarization (attitude mostly)

[Blinov Igor]

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?
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-- 
С уважением, Игорь, RW3XL