Topband: BOG Antenna Measurements

[Carl]

>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