Hi Don,
Your rational seems reasonable to me. And you can always change the 70cm to RHCP if needed....tho the first time, while on the ground, is easiest ;)
I learned the power of polarity with AO-51. Built an 8 turn G3RUH helix RHCP for 70 cm and wondered why it was so hard to hear the one transmitter. I put up an M2 with LHCP and WOW what a difference. Was fun being able to listen to both at the same time!
73, Mark N8MH
On Wed, Apr 7, 2021 at 6:47 PM Don Solberg dsolberg8132@gmail.com wrote:
In the past I saw a lot of discussion on if it was better to use RHCP or LHCP, but today most of the LEO satellites use linear polarization.
I may be mistaken but the only LEO satellite that I know of that uses circular polarization is SO50, which uses LHCP for the 70 cm downlink.
I am in the process of replacing a dual band linear antenna with the M2 LEO pack. I was thinking about setting the 70 cm antenna for LHCP and the 2M antenna for RHCP. This would maximize the downlink from SO50 but also give me a lot of attenuation between 2M and 70 CM which would help with desense.
I have a desense problem with my current Cushcraft antenna, even with a diplexer as a desense filter. For the LEO pack antennas I will not be using M2's aluminum boom, but instead have a 12 ft fiberglass boom.
Am I missing something or is this the "best" way to go? Most of my operation is thru the linear SSB band birds.
73,
Don K9AQ
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