Hi Chris Ah it just depends what you are measuring it with as well !!
Alan G3NYK

----- Original Message ----- 
From: "Stefan Schäfer" <[email protected]>
To: <[email protected]>
Sent: Friday, April 15, 2011 1:57 PM
Subject: Re: LF: VLF - vertical probe measurements


> Hello Chris,
>
> I would expect a sqare law relationship as well since the probe is a
> capacitive divider and thus the voltage should be directly proportional
> to the antennas voltage. And this rises with sqrt(2) x the power...
>
>
> 73, Stefan
>
>
> Am 15.04.2011 14:40, schrieb Chris Osborn:
> > 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
> >
>