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Isolation problem 2 weeks 1 day ago #300

Hi boss
I have contest 4 banders system
My antenna system is OB18-6,and QPXC8 + HFC4500 + 40M-20M-15M-10M Band Pass Filter Series XL
Two Radio output Antenna Genius 8x2, connect to my antenna system
Now i have a problem,
When the two stations are working at 40 meters and 20 meters respectively,
Caused a lot of interference with each other,

Both stations have only 100W power output
Have a reliable grounding system
The antenna parameters are normal, and CMC chokes are used at the radio and antenna ends.

So why is this happening?
In the pictures and videos I posted, the actual situation is much more serious than this. I can provide more pictures and videos.


73 de bg6snj

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Isolation problem 1 week 5 days ago #302

OC,

we check isolation from 40M filter, through QPXC8 extender, to antenna, and it is 100dB, more than needed. Will send you plot on email.

Problem is somewhere in system. From our experience it can be CMC problem, bad contact, or even low quality coaxial cable. Or something else, but it is impossible to determine remotely.

First check isolation from 40M filter to antenna.

73
Ranko

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Isolation problem 4 days 17 hours ago #304

I found the reason
Is the effect of wet weather
After the weather is clear, the parameters are normal
Then the question is how to solve the impact of wet weather on it

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