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[TowerTalk] Half slopers using a tower

To: <>
Subject: [TowerTalk] Half slopers using a tower
From: (Joe Subich, K4IK)
Date: Thu, 3 Jan 2002 12:51:12 -0500


> K3BU:
> With half slopers (wire length = quarter wave electrical) 
> disconnected and unused, they act like "nothing" for RF at 
> the frequency of operation. This "trick" of disconnecting 
> quarter wave radiator (wire) from the ground connections is 
> used to disable the vertical, detune it from the resonant 
> frequency = make it "invisible" to RF (at that frequency). 
> For wire like that to act as a "counterpoise" it has to be 
> connected to the antenna system or be near half wave 
> electrical length to act as a parasitic element and be 
> positioned so it can direct the RF from the radiator in the 
> desired direction. 

You made an assumption about the configuration under discussion 
(as did Tom).  The original poster did not specify if the un-
used 1/4 wave wires were grounded or floating (the switch boxes 
Tom designed for Ameritron *GROUND* unused antennas for safety).  

As such, you had no right to call Tom's posting "the dumbest 
statement of the year."  You owe Tom and everyone else an 
apology ... 

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