On 3/25/2018 3:17 PM, Jim Brown wrote:
It's important to remember that SWR is NOT an indication of antenna
performance. It ONLY indicates a match to the feedline as measured in
the shack. It does not tell us that the antenna has gain, nor does it
73, Jim K9YC
Jim is exactly right (as usual). When I first got my MonstIR up, I took
advantage of the fact that I could adjust the length of the three
elements individually. Just to prove a point, I tuned up the antenna
the usual way for CW (all 3 elements optimized); then I QSYed the
radio to the phone band. The SWR was not ridiculously high and a
radio with a tuner could drive it. I retuned just the driven element to
get the best SWR I could, without changing the parasitic elements.
That improved the SWR somewhat. However, as expected, the antenna
suffered a substantial drop in gain and F/B ratio to where it wasn't
much better than a rotatable dipole.
Rick N6RK
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