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Re: Prefered AO40 Transmit Antennas ?



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On Jun 28 2003 10:40 +1000, Peter Moscatt wrote:

> What is generally used for the 70cm uplink and what would the typical
> gain need to be for a good link into AO40 ?

I don't know if it is the "generally used" uplink antenna, but I am seriously
considering a simple 70 cm (RHCP) helical antenna for my station. According
to AMSAT-SM, 200 W EIRP "is enough", but they don't state if that is for SSB
or CW. That is 10W into a 13-element X-Yagi, or 50W into a 4-turn helical
antenna, if their web page can be trusted (which I hope!). Of course, the
exact gain you need will be a function of how much power you can feed to the
antenna at 70 cm! I, for one, only have 5 W at 70 cm, minus cable losses, so
the four-turn helical won't cut it at all unless I get a 13-17 dB PA
(reasonable cable losses and some margin figured in).


Michael Kjörling

- -- 
Michael Kjörling :: michael@kjorling.com :: SMØYBY JO89  ^..^
PGP: 3723 9372 c245 d6a8 18a6  36ac 758f 8749 bde9 ada6   \/
Also 95f1 074d 336d f8f0 f297  6a5b 2aa3 7bfd 8a70 e33e (old)
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