I was thumbing through the latest Monitoring Times yesterday, when I
saw an ad for the AOR SDU-5500.

This seems to be very much like a spectrum analyzer. I've always
wanted one of these. However, I hear that you MUST use it in
conjunction with the AOR AR-5000 or similar radio.

Is this true? How terrible if it is! And if not, can it work with a
BC 780XLT?

Has anyone ever used one of these things before? Is it as 'difficult'
to use as a freq counter? Is it swamped by cellphone and pager
signals?

Thanks