I have been looking for information on BOGs and have not been able to find
any info on measured impedance values. Other than they are low, depends on
ground, etc. I thought I would relate my recent experience.
My own experience with 3 500' unidirectional BOGs over very poor ground is
that a 220 Ohm resistor appears to be close to ideal for me. YMMV depending
upon the ground and how close to the ground the BOG actually is. Mine mostly
ride 3-6" above ground on low plants, twigs, etc. and thru the woods. These
were installed to reduce crud pickup from neighbors in the belief that they
are not as susceptible as the regular Beverages. Operation has shown them
usually more beneficial crud reducers but not as good on real long haul DX.
The 73-202 cores are wound transformer style and not unun autotransformer
versions; the reason is to minimize common mode using the normal suggested
seperation of antenna and feedline grounds
I hope others share their observations.
Carl
KM1H
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Stew Perry Topband Distance Challenge coming on December 29th.
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