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