I run mine off of my main supply with all my other stuff.  Center is 
positive.  What I like is you can leae it in line all the time.
73
Butch
WA0VJR
Node 3148
Wallace, ks.


On Tue, 3 
Sep 2013, Tom Behler wrote:

> 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
>
>