Hi Steve,

You are correct in your assumption. The preselector isn't really necessary.
My statement was purely theoretical.......I think that the only way you
would see a difference would be if you would have a few signal generators
hooked through isolators and combiners, set up at high output levels and
tuned to different frequencies.
This would allow you to see the multi-tone response under very adverse
conditions. Under these conditions, a preselector would help.
Do you need to do this in the real world? Not really, unless you were using
this receiver on a ship where there were several high power transmitters
being used at the same time.

Pete

wrote in message
oups.com...
This is interesting. Have you (or anyone else in the group) actually
used a preselector and/or highpass filter with a 7030 and found it to
result in improved performance? The 7030 is said to have such a robust
front end that additional filtering is the last thing I'd expect to
make a noticeable difference. In fact, I'd expect whatever tiny
improvement that resulted from the extra filter to be outweighed by
insertion loss.

However, I have an open mind about this--as well as a Kiwa highpass
filter, standing by.

Steve