Dennis,
You have classic third-order intermodulation interference. 146.970 times 2
= 293.940 MHz. Subtract the 146.700 signal and you have 293.940 - 146.700
= 147.240 MHz, the output of your linked repeater. Other mixing products
are possible. I suspect that neither the 146.970 repeater nor the 146.700
repeater has a circulator on the output. Bandpass cavities on the output
are another option.
73, Eric Lemmon WB6FLY
ki5fw wrote:
> Hey Guys;
> Why does my 146.970/Rptr when linked to a 147.240/Rptr get interference
> from a 146.700/Rptr. The 146.700/R is about 5-7 miles from my
> 146.970/R. When the link is up and someone uses the 146.700/R it
> creates terrible interference and you can actually understand what is
> being said on the 70/R.
> The 70/R will not be heard or cause a problem until the 97/R is
> accessed while linked to the 147.24/R. There is no problems when the
> link is down.
> Will a notch filter on the remote base T/cvr to notch out 146.700 be
> the cure? The remote base is frequency agile and wonder if the notch
> filter is the way to go. Guess it depends on how wide and deep the
> notch is???
> I tried the intermod Calculator and I think I see what the problem is,
> but not sure if I'm looking at it correctly.
>
> TNX in Advance,
> Dennis ki5fw
>
>
> Yahoo! Groups Links
>
>
>
>
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