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I measured the gain today between my 90 metre
perimiter vertical loop resonated on 137 khz and my vertical
system. The vertical has a 20 db gain over the loop measuring the
noise floor. Using the Decca RF pre amp with the loop gets close to the
vertical performance but with the disadvantage of being only
bi-directional. Measuring a signal above the NF indicates the same 20 db gain by
the vertical. The band is quiet with no environmental or locally
generated noise problems.
The vertical is way ahead of the loop at this
QTH. The loop is not worth considering as a TX antenna given the above
results.
This recent test confirms previous
observations.
73 de Mal/G3KEV
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