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" <[email protected]>
To: <[email protected]>
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:[email protected]]
> Sent: 2001-06-18 13:38
> To: [email protected]
> 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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