Hi Tom,
You put the tuning aid in line between the antenna tuner and the radio. When you  turn it on, you'll hear white noise in the receiver, the Palomar unit and, I think, the MFJ units pulse the noise to make it more distinct. You begin adjusting your manual tuner listening for a null inthe white noise. It's usually a deep dip inthe noise. When you've made the white noise disappear as much as possible, you're as close to 50  ohms as your tuner will get with the currently connected antena. If you practice with a 50 ohm dummy load, or a known resonant antenna, you'll get very good at hearing the nice, deep null that indicates a good match instead ofthe  shallower one that indicates a greater miss-match.

73

Ron Miller
On Aug 16, 2012, at 6:55 AM, Tom Behler <[log in to unmask]> wrote:

>        Ron:
> 
> So, how exactly does a noise bridge work?
> 
> I have some ideas, but how do you tune the antenna without transmitting, and 
> be sure your SWR is low?
> 
> As I said in my last post, I'm new with regard to those devices, even after 
> all these years of hamming.
> 
> 73 from Tom Behler: KB8TYJ
> 
> ----- Original Message ----- 
> From: "Ron Miller" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Wednesday, August 15, 2012 11:55 PM
> Subject: Re: Tuning aids, noise bridges, etc.
> 
> 
>> The downside of tuning aids such as the Adam is that you'll be 
>> transmitting
>> a signal, either continuously or in short bursts--annoying to those around
>> you. A noise bridge type tuning aid let's you couple the antenna without
>> transmitting a signal. Much more considerate to your fellow hams.
>> 
>> 73
>> 
>> Ron Miller