Hi all !
For 70cm I have a 2x8 elements beam. Fixed RHCP polarization.
Downlink of AO51 on 435.300 is always strong, even though I do not have a pre-amp.
Now, the 435.150 downlink I always hear very weak.
a) is this because of the fact that AO51 uses LHCP on 435.150 ? b) anyone else confirming the same sharp difference between RHCP & LHCP on the AO51 downlink ? (guess this could be an argument NOT to use circular polarization)
Reason for asking: I have now a 23cm antenna, and 10W out of my TS2000X and so I wanted to give the 23cm up / 70cm downlink a try ... but of course I first need to hear the downlink :-)
... yes, I know I should use pre-amps ... !
73, Henk, PA3GUO
Henk,
Yes, the CP is going to be opposite, and switching direction can make several S-units of difference. Of course, using a pre-amp will make even the wrong polarization usable at least most of the time.
73s,
Alan WA4SCA
a) is this because of the fact that AO51 uses LHCP on 435.150 ? b) anyone else confirming the same sharp difference between RHCP & LHCP on the AO51 downlink ? (guess this could be an argument NOT to use circular polarization)
Hi Henk, I think you've got it right, the polarity difference is a killer.
73, Drew KO4MA
Thanks Alan & Andrew for confirming.
As alternative I could use my portable antenna, but having that in my hands in the garden and the 23cm uplink in the shack is difficult :-)
Need to wait until AO51 will be in 23cm up and 435.300 downlink.
Until then: thanks !
Henk, PA3GUO
ps: the 23cm is to prepare for Cute
a) is this because of the fact that AO51 uses LHCP on 435.150 ? b) anyone else confirming the same sharp difference between RHCP & LHCP on the AO51 downlink ? (guess this could be an argument NOT to use circular polarization)
Hi Henk, I think you've got it right, the polarity difference is a killer.
73, Drew KO4MA
participants (3)
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Alan P. Biddle -
Andrew Glasbrenner -
Henk, PA3GUO