> Bob Dengler <[EMAIL PROTECTED]> wrote:
> I've seen more than the expected level of IMD problems
> for some reason when dealing with close spaced TXs.
"Some reason" is most often a person being cheap or stupid.
> There is one site around here with 2 repeater outputs 20
> kHz apart. When both are up they sometimes 3rd order-mix
> 20 kHz below the lower output & 20 kHz above the upper
> output. When present the mixing products are strong enough
> to be heard 10 miles away. Both systems allegedly have
> the proper filtering/isolation in place, so I suspect the
> mix is occuring in a passive (chain link fence, tower
> joint, etc.), which would explain why it comes & goes.
> Bob NO6B
The more logical source would be an amplifier not protected
by a circulator or isolator. The list would include other
repeater rfamplifiers at the same or adjacent site.
cheers,
skipp
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