[Antennaware] K9AY Terminated RxLoop wire length

K9AY k9ay at k9ay.com
Mon Oct 13 16:54:38 EDT 2008


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. Go 
ahead and see how much it can help!

73, Gary

> Hi
> 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 control
> box (no pre-amp, but working on putting one together). Especially the F/B 
> is
> very impressive!
> Receive signal level is good on 80 meters. However on 160 meter the signal
> 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 signal
> 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 of
> 32 meters how would this effect the vertical and horisontal radiation
> patterns ? (Im a aware that this would compromise 80 meter opertation with 
> a
> looplength > 0.3wl)
> Sincerly
> OZ1AXG Flam
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