What is the MFJ magic circle ?
 

I have tried to find detailed information about the MFJ-935 or 936 Loop
Tuner but so far it has remained a mystery.

No one seems to know what is inside the box, this is surely out of character
with the Ham Radio hobby, unless maybe things have changed so much that we
now accept any black box without question.

If you have dared to peak inside a magic circle box please tell

Thanks

On Tue, 19 Jul 2005 00:31:04 GMT, "Bjay"
wrote:

I have tried to find detailed information about the MFJ-935 or 936 Loop
Tuner but so far it has remained a mystery.

No one seems to know what is inside the box, this is surely out of character
with the Ham Radio hobby, unless maybe things have changed so much that we
now accept any black box without question.

If you have dared to peak inside a magic circle box please tell

I have a Cushcraft R-7, which I got by trading in an R-7000 (long
story). It has a black box about 8" x 6" x 2" that is the matching
network, etc., into which the 50 ohm coax from the transceiver plugs.
I opened it up once and had a good look around. I closed it back up
and have never given it another thought.


Bob, W9DMK, Dahlgren, VA
Replace "nobody" with my callsign for e-mail
w9dmkatcrosslinkdotnet
http://www.qsl.net/w9dmk
http://zaffora/f2o.org/W9DMK/W9dmk.html

On Tue, 19 Jul 2005 00:31:04 GMT, "Bjay"
wrote:

I have tried to find detailed information about the MFJ-935 or 936 Loop
Tuner but so far it has remained a mystery.

No one seems to know what is inside the box, this is surely out of character
with the Ham Radio hobby, unless maybe things have changed so much that we
now accept any black box without question.

If you have dared to peak inside a magic circle box please tell

Thanks



The boxes contain tuners for small loop antennas. Go to the mfj site;
they show an internal picture of the 933 loop tuner. Couple of
variable caps. You might also see if you can download the manuals for
these tuners from the MFJ site -- many are available.

Or check your ARRL Antenna book for tuning circuits for small loop
antennas. No mystery.

bob
k5qwg

"Bob Miller" wrote in message
...
On Tue, 19 Jul 2005 00:31:04 GMT, "Bjay"
wrote:

I have tried to find detailed information about the MFJ-935 or 936 Loop
Tuner but so far it has remained a mystery.

No one seems to know what is inside the box, this is surely out of
character
with the Ham Radio hobby, unless maybe things have changed so much that we
now accept any black box without question.

If you have dared to peak inside a magic circle box please tell

Thanks



The boxes contain tuners for small loop antennas. Go to the mfj site;
they show an internal picture of the 933 loop tuner. Couple of
variable caps. You might also see if you can download the manuals for
these tuners from the MFJ site -- many are available.

Or check your ARRL Antenna book for tuning circuits for small loop
antennas. No mystery.

bob
k5qwg



Thanks for your reply Bob but it is the 935 or 936 loop tuner that I am
interested in and not the 933.
the one that converts a short piece of wire into a small tuned loop.
Cheers

Thanks for your reply Bob but it is the 935 or 936 loop tuner that I
am interested in and not the 933.
the one that converts a short piece of wire into a small tuned loop.
Cheers


Didn't you even look? On their website there is a beautiful high
resolution picture of the interior of the MFJ-936B tuner. I would hazzard
a guess that it is nearly identical to the out-of-production 936.



Ed

"Ed" wrote in message
. 93.175...

Thanks for your reply Bob but it is the 935 or 936 loop tuner that I
am interested in and not the 933.
the one that converts a short piece of wire into a small tuned loop.
Cheers


Didn't you even look? On their website there is a beautiful high
resolution picture of the interior of the MFJ-936B tuner. I would
hazzard
a guess that it is nearly identical to the out-of-production 936.



Ed
Thanks I have just located the page and the pictures are very good.

Cheers and thank you all for your help.