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LF: RE: VLF - vertical probe measurements

from [Rik Strobbe] [Permanent Link][Original]
To: "[email protected]" <[email protected]>
Subject: LF: RE: VLF - vertical probe measurements
From: Rik Strobbe <[email protected]>
Date: Fri, 15 Apr 2011 15:11:39 +0200
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Thread-index: Acv7ap3SI/cdPG7sSW2bqwBaGJPTIQABAqHI
Thread-topic: VLF - vertical probe measurements
Hello Chris,
 
maybe a stupid question (wouldn't be my first one): how do you alter the PA current ?
If you change the PA current by changing the PA voltage then the output power will change more or less with the square of tht PA current (P = UxI and you change both U and I), what would result in a linear behaviour between PA current and probe voltage.
 
73, Rik  ON7YD - OR7T
 
Van: [email protected] [[email protected]] namens Chris Osborn [[email protected]]
Verzonden: vrijdag 15 april 2011 14:40
Aan: LF Group
Onderwerp: LF: VLF - vertical probe measurements

LF,
 
Acting on advice I have installed a whip aerial (probe) on top of a mast at the boundary of my property.
This is in order to monitor my VLF transmissions and to provide a reference level for any system improvements.
 
I noticed that the probe's pick-up voltage is directly proportional to my PA's supply current.
Assuming that the PA efficiency doesn't change drastically with current then would I be correct in assuming that the probe's voltage is directly proportional to the radiated power?
 
I was expecting a square law relationship . .
 
73
Chris G3XIZ
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