[Lowfer] Loop antennas

Fri, 17 May 2002 10:05:19 -0400

Bill

Is your 4XLitz loop 100 uH? I would have thought it would be somewhat lower than
that. Maybe not. I like sailing in uncharted water!

Jay

Bill Ashlock wrote:

> Hi Bob,
>
> >Has anyone checked the bandwidth of a tuned loop that you are using for
> >transmitting? Curious what the 3dB bandwidths are running.
> >Bob Roehrig  K9EUI
>
> The Q of a normal 50/50 TX loop on the Lowfer band runs from 100 to over 200
> which is higher than most loaded vertical antennas when the soil loss is
> factored in. The latest 4x Litz conductor for WA has an Rac of .40 ohms
> including soil loss (fully dry condition). The Q would be ~(185k x 2 pi x
> 100uh)/.4 = 290. The resulting bandwidth would be ~185k/290 = .64 kHz. Hmmm.
> Didn't I just read something about a 100Hz bandwidth in a certain FCC
> document?
>
> Bill A
>
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