Tom,

The noise bridge comes with a short DC power cord with bare wire ends.  The 
cable is approximately 3 feet in length. for connecting to your station's DC 
power supply.  There is a 9 volt battery snap-on type connector for this 
battery inside the unit.  I will try to determine the polarity of the 
external DC connector and get back to you.

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