Greetings Jerry,

thank you for this (yes I meant AO-92).

If I understand, you are saying the the satellite uses a conventional linear antenna.

However AO-92 is easy enough to access that a 3db loss from the polarity mismatch b/t linear and circular is not significant.

Correct? Todd

Sent from my iPhone

On Mar 11, 2018, at 6:46 PM, Jerry Buxton [email protected] wrote:

Todd,

Correct is not really a consideration, the way I see it. Will a CP antenna work? Yes. Polarization should not matter for AO-92. (BTW I presume you mean AO-92, not AO-91 in which case L band just flat won't work no matter the antenna, period.) :-)

I use RHCP because I built my antenna for AO-51 and that is was in use at the time. I believe that when CP is used on a satellite, at least in the AMSAT history, it has been RHCP most of the time so building for RHCP may have advantages for future satellites.

Jerry Buxton, NØJY

...

On 3/11/2018 15:44, Todd W Deckard wrote: Would it be correct to use a CP antenna on the L-band uplink for AO-91? If so which polarization?

Just purchased an ICOM X-2 on ebay that gets me 1.2ghz and the temps are getting civilized so it’s about time to get back on the air ...

My elev. over azimuth system is already swinging more mass than it was geared for and i’m looking to cook up a small antenna that doesn’t add too much straw to the camel.

I would like to go Helical just because ...

if anyone has an alternate suggestion I’d listen to any and all.

Thanks Todd KE0CMD Sent from my iPhone _______________________________________________ Sent via [email protected]. 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