>
>We also had an IF overload problem: off-channel signal would get through
>the 1st IF filter & IM with the on-channel signal, causing the squelch to
>close even though the adjacent-channel signal was filtered out by the 2nd
>IF filter. The problem was partially resolved by cutting the gain down in
>the 1st IF, giving the 1st IF amp a little more headroom. It's possible
>the 1st IF filters were bad - didn't have the time/equipment to check at
>the time.
On that train of thought:
I'm working up a mathcad file to check for possible problems.
Input to the file is the TX and RX frequency, plus the RX first IF.
You enter these values for all the rigs at the site, and it outputs these:
Transmit harmonics 2nd-7th
Rx image frequencies, as RX+IF and RX-IF
You can easily copy the individual "radios" to add more radios to the mix.
What else should I look for?
I thought about adding the images plus and minus 455 khz, but I'm not
sure that's all that useful.
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