[BC] Slant wire feeds vs series fed

[Frederick W. Seibold]

At 07:08 AM 1/25/06 -0600, you wrote:
>Does anyone know of a shunt-fed, monopole installation where the feed wire 
>is inserted at the tower base, makes a 90-deg bend, and extends up in the 
>vertical plane on the tower vertical C/L to attach at the feedpoint?

Yes, this arrangement is illustrated in the book "Radio Antenna 
Engineering" by Edmund LaPorte, circa 1940.  LaPorte was an RCA antenna 
engineer in the Golden Era.  So I'll guess if it made the book it must have 
been installed somewhere......    It seems to me that this is a sort of 
coax stub unlike the one-turn loop made by the slant wire + tower length to 
ground + ground radial to outer conductor of coax at lower end of slant 
wire.  There is usually a series capacitor between the bottom of the slant 
wire and the inner conductor of the coax to cancel the loop inductance, 
assuming the tower is resonant.

Fred W9FWS,  First Phone back when there was one.....


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