[CQ-Contest] SO2R Interstation Interference Issues

VK4TS Trent Sampson vk4ts at outlook.com
Tue Sep 6 17:50:37 EDT 2016

We have used a Single Force 12 tribander with three separate feeds on 20 15
and 10 in a Multi op station with negligible interference using W3NQN Band
Pass filters and no stubs - each station with amplifiers.  The largest
separation would have been less than 1m (3 feet). 

I would be looking at the performance data of the Filters - they do not
appear to be up to scratch. 


Trent VK4TS

-----Original Message-----
From: CQ-Contest [mailto:cq-contest-bounces at contesting.com] On Behalf Of Joe
Sent: Tuesday, 6 September 2016 6:55 PM
To: cq-contest at contesting.com
Subject: [CQ-Contest] SO2R Interstation Interference Issues

I am in the process of building a SO2R station and have a question of
interstation interference and bandpass filters. I live on a very small lot
and have no room for antenna separation. I only have wire antennas and a
vertical for 20 meters. I have a set of bandpass filters for each radio. I
still get quite a bit of phase noise hash on adjacent bands even with
filters. It doesn't seem that the filters make any difference at all ? The
biggest reduction in noise is between the dipole antennas and the vertical.
Can I ever expect to get the noise to acceptable levels with antennas so
close to each other ? Thanks -Joe N3HEE
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