RadioBanter - View Single Post - Antenna analyzer- no MW?

February 7th 06, 10:35 PM posted to rec.radio.amateur.antenna

wrote:
Another thing to think about: most of the analyzers around are pretty
much useless on low freqs anyway due to interference from AM broadcast
signals.

I recently finished shunt feeding my tower for 160m, and found that
my AEA CIA analyzer was completely useless trying to measure the feed
impedance. In the end I just used a regular swr meter to adjust the
shunt feed. I don't remember exactly how low the AEA goes, but it is
below 1.8 MHz.

Tor
N4OGW/5

Yes, it's ironic that the one thing "antenna analyzers" are pretty
useless for, in an urban environment at least, is analyzing antennas.

Some time back I mentioned how a "half wave filter" could be used to
reduce out-of-band signals without disturbing the measurement too much.
The postings should be possible to locate at groups.google.com. Please
read all postings, because I recall incorrectly saying that the filter
could be used at frequencies lower (for a lowpass) or higher (for a
highpass) frequency than the design frequency. I later corrected that. A
given filter is good over only about one HF band without significant
disturbance of the measurement.

Roy Lewallen, W7EL