Hi,

I usually don't have to turn down the RF gain to tune for a null.  When I 
get a deep null, the SWR is 1-1 and no further tuning is required.


Tom, I don't remember a manual, if there is one, its one page.

Bob, K8LR, [log in to unmask]

----- Original Message ----- 
From: "Dave Basden" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, August 29, 2013 6:21 PM
Subject: Re: MFJ Noise Bridge General Quiry


Hi Tom,

The noise bridge is a great way to initially adjust your external
tuner.  Once the tuner is set  for minimum noise, you can throw on
your amp and fine tune the SWR using the TW-1 if you like.  That's
what I have done here.  Again, it is important to turn down the RF
gain and turn off the AGC.  Initially I thought it was a dud as I
couldn't hear any noise reduction as I adjusted the external
tuner.  Once I turned down the RF gain and turned off the AGC, it was
quite apparent where the noise lull was as I adjusted the tuner.

73,

Dave, W7OQ

At 10:34 AM 8/29/2013, you wrote:
>Got it, Howard.
>
>These are good points to be noted for sure.
>
>I'll be interested in what others have to say, but I especially like the
>idea of not having to put a signal on the air.
>
>Does the noise bridge come with helpful instructions??  I ask this because
>in my experience with MFJ, their instruction manuals often leave a lot to 
>be
>desired.
>
>Tom Behler: KB8TYJ
>
>
>-----Original Message-----
>From: For blind ham radio operators [mailto:[log in to unmask]]
>On Behalf Of Howard, W A 9 Y B W
>Sent: Thursday, August 29, 2013 1:26 PM
>To: [log in to unmask]
>Subject: Re: MFJ Noise Bridge General Quiry
>
>Tom,
>
>By using the SWR function on your TW1 in the tone mode, you can tune your
>tuner for the lowest pitch tone which will be of course the lowest SWR.  In
>order to adjust your tuner, you will have to transmit a signal on the air.
>
>With the MFJ or Vectronics tuner aid, you do not have to put a signal on 
>the
>air.
>
>It must be noted that the tuner aid is rated at 300 watts or less.  You
>would insert this right after your transceiver and adjust your tuner while
>bypassing your linear amp, if you have one.
>
>73
>
>Howard #3
>
>----- Original Message -----
>From: "Tom Behler" <[log in to unmask]>
>To: <[log in to unmask]>
>Sent: Thursday, August 29, 2013 12:13 PM
>Subject: MFJ Noise Bridge General Quiry
>
>
> > Hi, all.
> >
> > Please forgive this quiry, since I'm certain that, for many on the list,
> > it
> > is rather elementary.
> >
> > The recent discussion of the MFJ noise bridge, and its possible
> > discontinuation, is making me want to learn more about the product and 
> > its
> > potential usefulness for me.
> >
> > Right now, when I am working with antennas and my Tentech 238A manual
> > tuner,
> > I use the LDG TW1 to measure SWR, and both forward and reflected power.
> > Although I do find the TW1 to be less-than-totally accurate, especially 
> > on
> > the lower bands in comparison to the SWR/watt meter on my TS590, it has
> > been
> > sufficient in meeting  my needs at least for the most part.
> >
> > Is there a compelling reason why I might want to consider purchasing the
> > MFJ
> > noise bridge?  In other words, what could it help me with that the TW1 
> > is
> > unable to do?
> >
> > Of course, one could always make the argument that the MFJ noise bridge
> > could serve as a useful back-up, should my TW1 die, which may be a good
> > enough argument in and of itself.
> >
> > Just thinking out loud here, I guess.
> >
> > Tom Behler: KB8TYJ