[TowerTalk] Antennas for SO2R station

[Jim Brown]

Challenges like yours demand that we not give anything away in the 
design of our stations. Part of that is the choice of radios, and the 
Elecraft K3-series rigs are greatly superior to the ICOM and Yaesu rigs 
for multi-transmitter operation. Stubs to kill amplifier harmonics and 
serious chokes at every feedpoint also matter. See k9yc.com/7QP.pdf for 
what W6GJB and I did to run two K3/KPA500 stations with antennas on the 
same mast separated by 3-5 ft. I have 5B4AGN filters at home, augmented 
by stubs for the amps; Glen's contesting trailer has equivalent W3NQN 
filters in addition to the stubs.

73, Jim K9YC

On 3/1/2021 10:20 AM, WW3S wrote:
> I live on a small lot, 80x180, in a subdivision....I have a 50ft tower 
> with a 3L Steppir on it.....I had planned on putting another Steppir 2L 
> about 7 ft above the tribander.....BUT......my current SO2R setup I'm 
> using a Hytower as the second antenna.....the rigs are a 7610 and 
> 7300.....I have 5B4AGN bandpass filters on both rigs.....I'm already 
> having interference issues between the rigs now, so I think moving a 
> second antenna to the same mast is asking for more trouble. Just 
> wondering if anyone uses 2 antennas on the same mast for SO2R? Also, is 
> the 7300 maybe a problem? I heard that radio generates a lot of phase 
> noise on TX, not so good in SO2R applications. Anyway, planning for some 
> tower maintenance this summer, and looking for suggestions on optimizing 
> the station for SO2R....