[Lowfer] Loop Antennas for Transmitting

Ed Phillips [email protected]
Thu, 08 Aug 2002 07:57:29 -0700


Bill Ashlock wrote:
> 
> Hi Ed
> 
> > > My next loop article attempts to explain in detail how to set up an
> > > effective TX loop from A-Z. Right now I'm stuck on trying to
> >mathematically
> > > explain how I can be measuring more far field radiation than I should,
> >per
> > > the std radiation resistance equations!
> > >
> > > Bill
> >
> >That will be interesting.  What are you going to do about the resulting
> >bandwidth for a really low-loss design?
> 
> I'm at a Q of about 200 with both the Litz cable and 1/2" cu pipe. The soil
> loss at the moment is about .22 ohms and probablay won't improve more than a
> few 100ths. Therefore the limiting Q would be under 500 even if the
> conductor had a 0 ohm Rac. This wouldn't pose much of a handicap for CW
> operation - nothing like the Qs in the thousands that the guys operating
> loops in the HF Ham bands experience.
> >
> Bill

	Roger and very interesting. How do you measure or figure the soil
loss?  Ground circuit loss and soil loss appear to be common evils for
VLF!

Ed