[amsat-bb] Re: Help wanted on CP antenna design

Simone terrando at tiscali.it
Wed Jul 17 05:58:17 PDT 2013

I must have screwed up with units somewhere...

Simone - IU1AFY/F4VPY

2013/7/17 Zilvinas, LY2SS <zilvinas at augma.lt>

> On 2013.07.17 10:11, Simone wrote:
>> Hi Phil,
>> QFH is effectively circularly polarized, it is often used for GPS
>> receivers, since when you point it skywards the main lobe points trough
>> the
>> zenith, while nulls are pointing to the horizon (where you do not have
>> satellites normally).
>> In my opinion QFH risks to be quite bulky for a balloon, since it will
>> occupy a cylinder 1 wavelength high (70cm in your case).
> QFH for 70cm band is 264 mm height only (and 84 mm in diameter).
> 73!
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