[amsat-bb] Re: AO-7 Mode A antenna
jhjipping at ameritech.net
Sun Oct 31 06:32:54 PDT 2010
Back to the "Good Ole Days". The best antenna I ever had to receive
sat signals on 10 meters was a pair of crossed dipoles at an angle of 45
degrees to the steel tower. It worked very well in several
configurations. The two dipoles were:
1. Just tied in parallel. Impedance matching was a little bit of a concern
2. I tried a pair of impedance matching stubs much like that used for
circular polarized antennas for 2 m and 70 cm.
3 I tried a pair if relays that allowed me to select any pair of the
four legs for some sort of directivity using the tower as a "reflector"
I used this configuration for all the old AMSAT and Russian mode A birds
with with much better than avearge success.
Helpful ?? Hope so!
Jim Jipping, W8MRR
AMSAT # 5512
Low number translates to old geezer
More information about the AMSAT-BB