[Amps] QRO operation into a 80 meter vertical

[peter chadwick]

Being a folded unipole, it has a high feed impedance - 1200 ohms or more. The current in the radials is measured by taking the ring to which they were all connected and using a 250mA thermoammeter between the base of the tower (grounded) and the ring, and feeding full power into the antenna. The radials were lying on the ground. Same effect when elevated. This was done after it was found that adding radials had no measurable effect on feed impedance.

73

Peter G3RZP


========================================
 Message Received: Feb 21 2014, 02:27 PM
 From: "Mark Beckwith" <r-emails at n5ot.com>
 To: amps at contesting.com
 Cc: 
 Subject: Re: [Amps] QRO operation into a 80 meter vertical
 
 Sorry [Amps] but this antenna conversation is here and now,
 
 Peter G3RZP said:
 
 > No radials because .... no current could be detected in them
 
 Does this mean that electrically the exact setup (tower+SteppIR) essentially 
 looked like a half wave?  How do you measure current in radials (Sorry I'm 
 sure that's a dumb question, but I don't know how to measure current in 
 radials).
 
 Mark, N5OT 
 
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