[amsat-bb] AO-91 and circular polarization?

[Todd W Deckard]

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 <n0jy at amsat.org> 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 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
> 
>