http://www.mtmscientific.com/loop.html

Anyone got a circuit diagram?

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On 5/23/2010 7:43 AM, Man-wai Chang to The Door (33600bps) wrote:

http://www.mtmscientific.com/loop.html

Anyone got a circuit diagram?


I have one I made years ago that is similar, so I can describe it for you.

Materials needed - about 32m of wire, light plywood (I used scrap),
365pf (or anything close) capacitor, connector of choice.

My box is made with 127cm by 13cm plywood pieces joined as an X, which
will give you a 90cm square box. The dimensions are not very critical.
Drill 10 evenly spaced holes near the end of each piece. Thread the
wire through the holes until 10 turns are in place. You will bring the
2 tails of wire in to a point near the center of the X where you have
mounted the tuning capacitor. Solder the tails to the capacitor. Drill
2 holes in the end of each piece just inside of the 10 turn loop for the
pickup loop and thread a 2 turn loop into place. Run those tails to a
point near the center of the X where you have mounted your connector of
choice. Solder to connector.

Connect your AMBCB radio and tune the capacitor for max signal strength.
Enjoy!

Vary size of box, number of turns in loop, and value of the capacitor
for other bands.

tom
K0TAR

On May 23, 10:07*am, tom wrote:
On 5/23/2010 7:43 AM, Man-wai Chang to The Door (33600bps) wrote:



http://www.mtmscientific.com/loop.html

Anyone got a circuit diagram?

I have one I made years ago that is similar, so I can describe it for you..

Materials needed - about 32m of wire, light plywood (I used scrap),
365pf (or anything close) capacitor, connector of choice.

My box is made with 127cm by 13cm plywood pieces joined as an X, which
will give you a 90cm square box. *The dimensions are not very critical.
* Drill 10 evenly spaced holes near the end of each piece. *Thread the
wire through the holes until 10 turns are in place. *You will bring the
2 tails of wire in to a point near the center of the X where you have
mounted the tuning capacitor. *Solder the tails to the capacitor. *Drill
2 holes in the end of each piece just inside of the 10 turn loop for the
pickup loop and thread a 2 turn loop into place. *Run those tails to a
point near the center of the X where you have mounted your connector of
choice. *Solder to connector.

Connect your AMBCB radio and tune the capacitor for max signal strength.
* Enjoy!

Vary size of box, number of turns in loop, and value of the capacitor
for other bands.

tom
K0TAR

Havent seen one of those in years. Made one when I was a kid in High
School. It was my project in woodworking and physics class.

Jimmie

On May 23, 7:43*am, "Man-wai Chang to The Door (33600bps)"
wrote:
http://www.mtmscientific.com/loop.html

Anyone got a circuit diagram?

$137.50... Dang.. Maybe I should start selling loops.. They sure
seem to be proud of them when they apply the price tag.
This is my version of the same appx thing, except using a
simple PVC frame. Can be built for chump change if you have
an old BC variable laying around. If not , the caps can be
bought on the web.. I scrounge mine out of old analog stereo
receivers, radios, etc..

On May 23, 5:22*pm, wrote:
On May 23, 7:43*am, "Man-wai Chang to The Door (33600bps)"

wrote:
http://www.mtmscientific.com/loop.html

Anyone got a circuit diagram?

$137.50... Dang.. Maybe I should start selling loops.. They sure
seem to be proud of them when they apply the price tag.
This is my version of the same appx thing, except using a
simple PVC frame. Can be built for chump change if you have
an old BC variable laying around. *If not , the caps can be
bought on the web.. I scrounge mine out of old analog stereo
receivers, radios, etc..

Yeah, I was thinking how fast I could mass produce say a dozen at a
time.

Jimmie

I have one I made years ago that is similar, so I can describe it for you.

Materials needed - about 32m of wire, light plywood (I used scrap),
365pf (or anything close) capacitor, connector of choice.

Thanks

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Connect your AMBCB radio and tune the capacitor for max signal strength.
Enjoy!

One thing: the MTM loop antenna doesn't need a connection to the AM
radio. That web-page, if I read it correctly, said you only needed to
put the radio next to the loop antenna.

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On 5/25/2010 4:19 AM, Man-wai Chang to The Door (33600bps) wrote:
Connect your AMBCB radio and tune the capacitor for max signal strength.
Enjoy!

One thing: the MTM loop antenna doesn't need a connection to the AM
radio. That web-page, if I read it correctly, said you only needed to
put the radio next to the loop antenna.


That will work if that's what you want to do. The radio's ferrite
antenna replaces the 2 turn pickup loop. If you want to be able to do
both, include the pickup loop anyway.

Good luck!

tom
K0TAR

On 05/25/2010 04:58 AM, tom wrote:
On 5/25/2010 4:19 AM, Man-wai Chang to The Door (33600bps) wrote:
Connect your AMBCB radio and tune the capacitor for max signal strength.
Enjoy!

One thing: the MTM loop antenna doesn't need a connection to the AM
radio. That web-page, if I read it correctly, said you only needed to
put the radio next to the loop antenna.


That will work if that's what you want to do. The radio's ferrite
antenna replaces the 2 turn pickup loop. If you want to be able to do
both, include the pickup loop anyway.

Good luck!

tom
K0TAR

Hi there,
I have had some experience with BCB boosters and found that it works
best with a long wire coupled to a loop that is grounded. The radio I
was using had a built in antenna wound inside the case and the untuned
loop coupled very nicely to the radio. With a ferrite rod inside the
radio it might not work so well.
Just an idea for you to play with.
Bill Baka

That will work if that's what you want to do. The radio's ferrite
antenna replaces the 2 turn pickup loop. If you want to be able to do
both, include the pickup loop anyway.


Being a noob in electronics (was never trained in that context), I need
to do my homework to understand your replies. Thanks!

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