I have a quick question, maybe somebody over there can help me:
I am in the process of installing up on my tower an A4S beam from
I did all the assembly at the ground level, and I tune it (adjust the
elements), for center of the bands, as Cushcraft instructions indicate.
To verify the accuracy of the resonance curve, I pointed it vertical,
with the reflector being the closest element to the ground (abt 4 feet), and
took some readings, on all 3 bands, with an AEA antenna analyzer.
The result is that the resonance curve is shifted up (like for SSB
tuning), on all bands!!
My question is, if this is a normal effect generated by the proximity of
the ground, and once in the air resonance will shift down, or I should trim
it for CW portion to get a final CENTER of the bands result????
Any opinion will be appreciated!
Many thanks, best 73s,
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