Howard, thanks much for the clarification here.  73, Jim

 ----- Original Message -----
From: "Howard, W A 9 Y B W" <[log in to unmask]
To: [log in to unmask]
Date sent: Tue, 3 Sep 2013 14:46:16 -0500
Subject: Re: MFJ Noise Bridge: Another Question

Jim,

The MFJ-202B is not the same animal as the MFJ-212.

The 202B MFJ RX Noise Bridge

Quickly adjust almost any antenna for maximum performance, 1 to 
100 MHz.

Lengthen or shorten your antenna for minimum SWR.  Measure 
resonant
frequency, feedpoint resistance and reactance.

Works with any receiver or transceiver.

Hand-calibrated resistance scale, expanded capacitance range and 
exclusive
built-in range extender.

The MFJ 212 MatchMaker for Tuner
MFJ-212 Tunes up your antenna tuner without transmitting a single 
milliwatt!
No power.  Precisely tune your antenna tuner for a 1:1 SWR -- no 
additional
"tweaking" needed.  Avoids overheating/arcing caused by high SWR 
and long
tune-ups.  MFJs RF*Guard bypasses the MFJ-212 to prevent damage.  
Handles up
to 300 Watts.  Works with all radios 160-6 Meters.

The 202B device is for adjusting antennas and the 212 is for 
adjusting your
antenna tuner.

73

Howard #3

----- Original Message -----
From: "Jim Gammon" <[log in to unmask]
To: <[log in to unmask]
Sent: Tuesday, September 03, 2013 12:38 PM
Subject: Re: MFJ Noise Bridge: Another Question


 How is the MFJ 212 different than the MFJ 202? I have one of the
 latter and there's no charger jack.  It only runs off the
 internal 9 VDC battery.  I hooked it up once to my receiver and
 tuned for a null but have no idea what kind of readings the 
knobs
 on the front may be giving me.  I assume there must be some
 numbers that correspond with the antenna resonance point or
 something.  Jim WA6EKS

 ----- Original Message -----
 From: "Howard, W A 9 Y B W" <[log in to unmask]
 To: [log in to unmask]
 Date sent: Tue, 3 Sep 2013 11:17:32 -0500
 Subject: Re: MFJ Noise Bridge: Another Question

 Tom,

 I measured the polarity of the MFJ suggested wall wart that will
 work with
 the Noise Bridge and the center of the DC plug is positive as 
Pat
 indicated.

 73

 Howard #3

 ----- Original Message -----
 From: "Tom Behler" <[log in to unmask]
 To: <[log in to unmask]
 Sent: Tuesday, September 03, 2013 8:34 AM
 Subject: MFJ Noise Bridge: Another Question


 Hi, all.

 I have another question about the MFJ Noise Bridge we have been
 discussing.

 I checked the MFJ web site, and found the MFJ 212 listed at a
 cost of $99,
 which is what I expected.

 They indicate that the device can be run either via a direct DC
 connection,
 or a wallwart power supply, which costs another $14.

 Rather than spending the $14 on the extra wallwart, I'd rather
 run the
 unit
 off my rig runner via an Anderson Power Pole connection.

 However, I'm not sure how the plug for the DC connection should
 be wired.
 For example, is the tip positive?

 In general, I'd be interested in how others on the list who have
 the noise
 bridge power the unit.

 Tom Behler: KB8TYJ