[CQ-Contest] Re: 2-Radio Interference

[Dave Hachadorian]

On Thu, 21 Dec 2000 18:42:02 -0600 Marty Tippin <martyt at pobox.com>
writes:

> On most bands, I have S-9 or higher broadband hash on the second 
> radio when 
> transmitting on the first 

This is not a front-end overload OR Harmonic problem.

All synthesized radios transmit wide-band noise. The noise is
real transmitted noise, and can be cured only by putting a filter,
such as a stub or bandpass filter on the TRANSMITTER.

For WRTC 96, where bandpass filters were not allowed in the original
rules, my partner and I used rg-58 stubs, which were built
inside the radios. These stubs were good enough to allow
qrm-free operation at the 100W level. Even after the rules were changed
to allow bandpass filters, we did not use them, although a full
set was available to us. At our wrtc station, the antennas were
only a few feet apart.

If you make some stubs out of RG-8, and put them on both radios,
you shouldn't have any problem at the 100W level.

Dave Hachadorian, K6LL
Yuma, AZ
K6LL at juno.com


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