At 2/8/2005 08:30 AM, you wrote:
> > 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.
I fail to see any logic or value in this statement.
> > 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.
Yes, but that does not explain the varying levels of IMD over time. I know
of many on-site IMD problems that were DF'd down to passives such as those
listed above.
Bob NO6B
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