Re: [CQ-Contest] radio interference

["Tonno Vahk" <tonno.vahk@mail.ee>]

Yes, bandpass filters are essential. Especially on the recieving end on 15m. 
Stub on output would help also.

I am using W3NQN filters on both radios in SO2R and I can listen to 15m 
without any interference while transmitting on 20m with 1 KW.

In that case the 15m antenna being 2 el Qubical Quad inside the 20m 2el 
Qubical Quad on the same boom and crosses!! Less than 2 feet between wires. 
Unbelievable job by W3NQN filters really!

merry christmas to all!

tonno
es5tv


----- Original Message ----- 
From: "Rick Dougherty NQ4I" <nq4i@contesting.com>
To: "cq-contest" <cq-contest@contesting.com>
Sent: 23. detsember 2004. a. 10:59
Subject: [CQ-Contest] radio interference


> Hi all..I am sure that some one out there can assist on this one.....my 15 
> mult antenna is on the same tower as the 20m 3 hi stack..i.e. its in the 
> field of radiation...the operator on the 15m mult station hears the 20m 
> station perfectly clear, no matter what frequency either station is tuned 
> to...its some sort of if overload? I can greatly reduce the level of the 
> 20m run station at the 15m mult by using a bandpass filter..I am also 
> wondering if I put a 20m stub at the antenna feedpoint for the 15m station 
> would that accomplish the same thing?? thanks and Happy Holidays de Rick 
> nq4i
>
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