[VHFcontesting] Multi-op interferance on IF freqs

[Dave Sublette]

Good morning Paul,

You might look at filtering and isolating the power sources for each 
band. Many years ago we found that interference between our various HF 
stations on Field Day was through common mode interference on the power 
lines.

Another thing to explore would be RF filtering;bandpass filters on the 
front ends or low pass on the lower bands and high pass on the higher.

Good luck,

Dave, K4TO

paul rollinson wrote:
> Good morning all,
> 
> During the last contest we expanded the bands we worked up to 10G from the bottom 4. This created a huge problem.
> 
> We had to shut down the 2, 220, and 432 stations to use the upper bands due to interference from the lower, high power stations on the IF rigs for the transverters. 6M had little effect but we only had 100W running. Murphy reduced our power level.
> 
> I speculate that a common patch panel and close proximity of the antennas may be the culprit but I'm looking for other opinions and potential solutions. Especially from the big multi-ops that run legal limit on 2 and 432 which we use for IF's.
> 
> June is coming and I'd like to start clearing this problem asap. We always run out of time.
> 
> 73 and thanks for the input,
> 
> Paul, KE1LI
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