[Antennaware] K9AY Terminated RxLoop wire length
oz1axg.nospam at dxmail.dk
Mon Oct 13 17:47:59 EDT 2008
Very interresting, 2 dB is not bad for just 2x2 meter (+15%).
When You added wire, did you strictly maintained the upper to lower wire
ratio (8:5), in order to maintain the shape ? that would elevate the
right/left slightly from ground, or did you maintain the 1.5 meter "above
ground" at the right/left side of the shape as the original design specifies
> In 2007, I experimented with larger loops -- same height as the original
> (about 8 meters), but almost 2 meters more on each side. In theory, the
> signal increase should have been 2 dB, which is hard to measure, but I am
> certain that these loops were more sensitive. The improvement was easy to
> hear in the AM broadcast band.
> Modeling shows that the F/B will be a little less on 80M, but there are
> other variables such as ground that also affect this, so it may remain
> It is easy to try the larger loops since you are not changing the height.
> ahead and see how much it can help!
> 73, Gary
>> I put together a Terminated half loop, and it is working very well. Its a
>> simple construction with only one loop (east/west) and a home made
>> box (no pre-amp, but working on putting one together). Especially the F/B
>> very impressive!
>> Receive signal level is good on 80 meters. However on 160 meter the
>> is very low.
>> Dimentions of the antenna is 7.80 meters highest point; 0.40 meter lowest
>> point. Sides are 8 meter (upper) plus 5 meter (lowerl) = total 26 meter.
>> I have read on the internet, several people adding wire to increase
>> levels on 160 meter. Adding wire to the current construction can only be
>> done by making the antenna wider.
>> Question: If I where to add 3 meter to each side of the antenna, i.e.10
>> meter (upper) puls 6 meter (lower) side, getting a total length of wire
>> 32 meters how would this effect the vertical and horisontal radiation
>> patterns ? (Im a aware that this would compromise 80 meter opertation
>> looplength > 0.3wl)
>> OZ1AXG Flam
>> Antennaware mailing list
>> Antennaware at contesting.com
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