Loops are touchy by nature and you have to be very sensitive to the
surroundings-metals, bodies (yes your body in close proximity will affect
tuning). I use a small antenna analyzer to get it close and sometimes I have
to adjust and step away from the antenna,take a reading and readjust I
Actually, tune for resonance, not 1:1 SWR. Loops tend to be 50 Ω, but that
isn’t the right measurement. Luckily, tuning for maximum noise is the same as
tuning for resonance.
wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)
> On May 14, 2020, at 7:36 PM, Fred
Small mag loops can be effective antennas if you can't put up 5 over 5
over 5. One caveat: They are resonant transformers and the loop MUST
be exactly resonant at your QRG. This means, bypass any ATU and tune the
loop [only] for 1:1 SWR. Using the "get it close and let the ATU match
it"
I've been playing with a MFJ loop for my second floor condo and I can say
that loops are extremely sensitive to any close objects/surfaces. For
instance, tuning changed significantly when I had mine laying on the roof
vs. ~4ft above it (to the point where SWR was marginal on the lower part of
40m
On 5/13/2020 12:42 PM, brianchapn...@rogers.com wrote:
> Im thinking of a loop. I've had good luck with them. Any thoughts?
I've been using a loop on the porch of our ground level apartment. At
15 watts. It is useless - can't get it to tune properly and I often
think that I would have a
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