> So... I tuned a spare can as a notch (~19db) at freq X and intend to
> place it in-line with the Radius in hopes of removing (lowering) the
> level of freq X getting into the Radius transmitter. A 20 dB
> reduction "should" reduce the intermod by 40 dB IF the mixing is
> happening in the Radius.
> I hope.....
>
> I intend to remove the antenna cable from the Radius, plug it into the
> T at the can and run a double-shielded cable from the can to
> the Radius.
>
> Does the length of the added cable matter?
For the most part, no, it won't matter. If you were putting multiple
cavities in series, with the notches all on the same frequency, cable
lengths would be more critical. As long as the notch cavity is high-Q
enough, and its return loss is high at the Radius' Tx and Rx frequencies,
there won't be a problem.
A more definitive test would be to just stick an isolator (dual stage
preferably) between the Radius and the antenna. Key up the Radius and
transmitter X, see if your receiver Y hears it. Sure, the receiver is going
to be deaf while you do the test, but it will conclusive, and will only take
a minute or so to run the test...
--- Jeff WN3A
