[Date Prev][Date Next][Thread Prev][Thread Next] - [Date Index][Thread Index][Author Index]
Circular polarity - Don't Bother!
- Subject: [amsat-bb] Circular polarity - Don't Bother!
- From: W1BFN@xxxxxxx
- Date: Sat, 30 Dec 2000 01:58:19 EST
About circular polarity antennas v. linear:
I have been reading the thread and have only one thing to add:
With the power of AO-40 and her high gain antennas, It Really Doesn't Matter.
Linear antennas will work just fine. Maybe better while we are dealing with
high squint angles. (and maybe not, but circular polarization won't help
much, either.)
Purists will doubtless shower me with proclamations that there is a 3 dB loss
when using a linear polarized antenna to look at a circular polarized signal,
to which I answer So What? It Really Won't Matter. If you must worry about 3
dB, you are already running too close to the edge, and should consider a
bigger antenna.
I have an hour of AO-40 decoded telemetry from a Myers dish (linear) and
intend to go to an 18 dB loop yagi (also linear)when S is aimed at us.
What is neatest about linear polarization is that It Doesn't Care about LH or
RH circularity.
This thing is a whole lot simpler than what you have made it, mainly because
of the strong signal which will be available from AO-40.
Happy New Year
Mike W1BFN
----
Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
AMSAT Home