[Lowfer] Part 15.

Fri, 19 Mar 2004 11:36:24 -0500

Dave

The use of small transmitting loops for commercial and military
applications often use a coupling loop to excite the bigger "antenna"
loop.

Think you'd have a difficult time convincing the F_C representative that
the bigger loop played no part as an antenna. Once he found the tuning
capacitor and gave it a spin the jig would be up.

With reference to vertical antennas, as pointed out by someone earlier,
the diameter of conductor is not stipulated. That would mean to me that
I could take a 15 meter length of wire that was 14.999 meters in
diameter and use a lathe to turn down all but one end of the wire to,
say, the size of a #8 wire. Of course, keeping a solid 15 meter diameter
"end" up at 15 meters above the ground could be a challenge!

Jay, W1VD

----- Original Message ----- 
From: "Dave Brown" <[email protected]>
To: <[email protected]>
Sent: Friday, March 19, 2004 1:01 AM
Subject: [Lowfer] Part 15.

> Just how well could a tx loop with 4/3 metre sides be made to
'accidentally'
> couple into a rather large 'receive only' loop?
>
> 73
>  Dave, ZL3FJ
>
>
> ----- Original Message ----- 
> From: "Bill Ashlock" <[email protected]>
> To: <[email protected]>
> Sent: Friday, March 19, 2004 2:42 PM
> Subject: RE: [Lowfer] Part 15
>
>
> > >Bill...your intuition is correct....worse case would be for F_C to
tell
> > >you to turn off the power switch.
> >
> > Yah, and then after turning off the switch, as ordered, I could
always
> > solder a jumper wire around it.  :)
> >
> > I have another fall-back approach that I have never heard discussed.
These
> > loops are so darn efficient due to their high Q that one can use a
15M
> > perimeter loop to be a coupling loop into a giant loop hidden deep
in the
> > woods. In my case I would gain >12 db over what I am running
now....... so
> > "bring it on"!
> >
> > Bill
> >
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