Topband: 160 wire yagi -- test info

GEORGE WALLNER aa7jv at atlanticbb.net
Tue Sep 21 18:35:55 PDT 2010


>> Jorge Diez, CX6VM wrote:
>> 
>> Anyone tried a 160 mts wire yagi?
>> 
>> 
>> Will appreciate some info about the performance and 
>>construction.


Jorge,

Last weekend Carlos (N4IS) and I tested a two element 
parasitic array.

The fed elment was an inverted L, with an 18 meter 
vertical section and a 22 m long sloping wire. The element 
was fed via an automatic antenna coupler (the one we used 
on TX3A). Test frequency was 1,830 kHz. The reflector, 
located 26 meters south of the fed element, was my 30 
meter tall center-loaded vertical. A variable loading coil 
mounted at the bottom was set to resonante the reflector 
at 1,810 kHz. The array was mounted on my sea-wall, about 
1.5 meter above sea-water. To the north and east of the 
array there was open water while on the west side there 
was good quality soil and a 25 m long swimming pool with 
saline (low salt) water.

Carlos, whose QTH is 26 miles North of mine, was able to 
measure a signal increase of 3 to 4 dB over the signal 
radiated by the fed element alone. (The signal was 
fluctuating due the antenna being flexed sideways by a 
fresh easterly breeze.) While the tests were not 
exhaustive, the results suggest that, when mounted over 
highly conductive soil (or water)a ground (water) based 
vertical parasitic array can provide meaningful gain.

I intend to conduct more thorough testing of a three 
element array in November.


73,

George, AA7JV



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