Message-ID: <001d01c0f7fe$78b29fe0$57ddfc40@mshome.net>
From: "Paul A. Cianciolo" <paulc@snet.net>
To: rsgb_lf_group@blacksheep.org
References: <7D653C9C42F5D411A27C00508BF8803D55C4ED@pdw-mail-r1.dstl.gov.uk>
Subject: LF: Re: RE: Anyone using a magnetic loop for 136 Khz?
Date: Mon, 18 Jun 2001 09:56:26 -0400
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Andy,
Thanks for the response!!!!!
WOW !  Do you still have a copy of the spreadsheet?
I would love to see a copy.

It seems like 10 Db down was not so bad considering how small the loop was.
I have the means to support a loop with the apex at over 100 feet.

I have not seen any info on multiturn magloops.  Please help I am very
interested.

How far were your turns spaced?   Also how didyou feed it?

So many questions...  Sorry Andy

Thank you again

Pauil A. Cianciolo

Paulc
W1VLF

Cloudbounce Webpage  http://www.qsl.net/w1vlf/
Rescue Electronic Surplus http://www.rescueelectronics.com

1982 Vanagon Diesel  Turbo Diesel 1.9
GE Electrak E20 and E15  electric tractors
First place in local tractor pulls  at 1750 LBS
With Stock E-20 Electric tractor
Air Rifle Target Shooting Enthusiast

----- Original Message -----
From: "Talbot Andrew" <ACTALBOT@dera.gov.uk>
To: <rsgb_lf_group@blacksheep.org>
Sent: Monday, June 18, 2001 9:11 AM
Subject: LF: RE: Anyone using a magnetic loop for 136 Khz?


> I initially used one on 73kHz.   Two turns of 10mm diameter water pipe,
> overall loop dia 3m.  Efficiency was about -50dB compared with -40dB for a
> modest 7m high T antenna so the loop went in the bin.  However, did manage
> to communicate on 73kHz over a 20km path to a portable Rx, which was a
> record distance then - using wideband CW !
>
> I produced a spreadsheet to calculate loop parameters; at these
frequencies
> small loops were very difficult to get down to reasonable losses - there
was
> certainly no comparison with the same amount of copper when used as a wire
> antenna.
>
> A pity I threw out the 3m dia loop, it would probably have done quite a
good
> job on Topband.
> ===============
> On another matter - does this reflector now not reflect messages to the
> originator ?   This morning I posted the earlier note about magnetometers,
> but it never came back to me, but replies did so it obviously got out.
> Noticed this at other times too.   Other messages seem to be coming in OK.
> Lets see if this one comes back..........
>
> Andy  G4JNT
>
>
> > -----Original Message-----
> > From: Paul A. Cianciolo [mailto:paulc@snet.net]
> > Sent: 2001-06-18 13:38
> > To: rsgb_lf_group@blacksheep.org
> > Subject: LF: Anyone using a magnetic loop for 136 Khz?
> >
> >
> > Hello Folk.
> >
> > I have had a sudden interest in small manetic transmitting
> > loops lately.
> > Have seen manty designs for 160 meters and above but not too
> > much on LF.
> >
> > Anyone running one of these at 136Khz?   How is the feeding done?\\
> >
> > Most designs that I have seen use tubing to reduce the I*R
> > losses.  Do to
> > skin effect I realize that current flows only on the
> > surface of the conductor.  This maseem like a very basic
> > question but do
> > current flow on the inside of the tubing?
> > And if it does of what use is it?  Seems to me like it would
> > not be useful
> > for radiating purposes since it is inside of a shielded pipe.
> >
> > Would not a flat strap cable be better?
> >
> >  Thank you
> >
> > Looking toward 136 Khz!!!!!!!
> >
> >
> > Paulc
> > W1VLF
> >
> > Cloudbounce Webpage  http://www.qsl.net/w1vlf/
> > Rescue Electronic Surplus http://www.rescueelectronics.com
> >
> > 1982 Vanagon Diesel  Turbo Diesel 1.9
> > GE Electrak E20 and E15  electric tractors
> > First place in local tractor pulls  at 1750 LBS
> > With Stock E-20 Electric tractor
> > Air Rifle Target Shooting Enthusiast
> >
> >
> >
>
>
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