Topband: Relationship Between Ground Wave and Low-Angle Radiation

N4ZR n4zr at
Fri Sep 13 14:23:09 EDT 2019

Rick, I misled you with the reference to low-angle radiation. I'm 
broadly aware of how ground conductivity in the Fresnel zone works.  
What I'm interested in doing is characterizing how much my signal 
improves as I add radials - sort of like a distant field-strength meter.

73, Pete N4ZR
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On 9/13/2019 12:39 PM, Richard (Rick) Karlquist wrote:
> On 9/13/2019 6:31 AM, N4ZR wrote:
>> I don't think I've ever read anything on this topic.  Basically, what 
>> I'm asking is, could ground wave to a fairly nearby Skimmer be used 
>> as an analogue to low-angle radiation to assess the effectiveness of 
>> radial systems on an inverted L?  W3LPL is about 30 miles from me and 
>> has a very capable Skimmer Server-based RBN node.
> A radial system has nothing to do with take off angle.
> Take off angle is strictly affected by ground conductivity
> over a much large area than even a "big" radial field.
> If you want to improve your inverted L, change it to a
> top loaded vertical (IE "umbrella" wires).  That will make a lot more 
> difference than adding radials.
> Rick N6RK
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