I must have been asleep when I made this post....................It was an
8717 or 8718............the 8753 only goes out to 3GHz!

Pete

"Pete KE9OA" wrote in message
...
While it is possible that your analyzer isn't working, it is also possible
that you do have some wild variances in impedance with your current setup.
I
took a look at the return loss of one of my antenna systems with a
tracking
generator/spectrum analyzer combination, and did see some multiple
resonance
nodes. This measurement was done, using a Narda directional coupler, which
is flat out to 12GHz, as measured on an HP 8753E Network Analyzer.
Some sort of transfer standard such as an accurate 50 Ohm load would
verify
if your analyzer is bad.

Pete

"Bob" wrote in message
...
I have a Diamond X-6000A triband antenna, and its SWR curves are 'wavy'
on VHF and a little on UHF, not the smooth symmetrical log curve one
might expect. It's likely the interaction of the other band resonances,
but nothing to lead me to believe it's broken.

I like the suggestion about trying a good quality dummy load on it (or
perhaps another analyser on the same group of antennas) before you
condemn the thing as junk.

Good luck!

B