[Lowfer] antenna current

Wed, 15 Oct 2003 12:17:21 -0800

Thanks John - your right in the loop config I wouldnt use one....

Cheers - no news from OET I see...

>From: "John Andrews" <[email protected]>
>Reply-To: [email protected]
>To: <[email protected]>
>Subject: Re: [Lowfer] antenna current
>Date: Wed, 15 Oct 2003 13:12:15 -0400
>
>Laurence,
>
> > From the Calcs with around 250W into the loop my "circulating" current
>maybe
> > in excess of 25A. - heck I need a bigger thermocouple!
>
>You might want to avoid that thermocouple altogether. It may add enough
>series resistance to be significant. I have used 100:1 and 50:1 current
>transformers with diode rectifiers. If you use a 100:1 transformer and
>terminate the secondary with a 20 ohm resistor, you get 5 volts RMS across
>the resistor with 25 amps on the primary. A half-wave rectifier and a cap
>will yield 7.07 volts less the drop in the diode. That arrangement will
>reflect 20/(100^2) = 2 milliohms into the loop circuit.
>
>John Andrews
>
>
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