Hi Jim,

I use a Vectronics vec512 noise bridge all of the time and it works GREAT! 
Unfortunately, it is currently out of stock and I don't know if Vectronics 
which is now part of MFJ will make any more units.  The VEC512 has two 
advantages over any other noise bridge.  First, you can keep it in line 
while you transmit as the unit has a relay that bypasses the noise bridge 
when the bridge is offas you can run up to 300 watts through it.  Therefore, 
I have my noise bridge hooked between my transceiver and my amplifier rather 
than after the amp.

The second advantage is that the bridge is set to 50 ohms and when you null 
out the pulsing hissing noise with an antenna tuner in your receiver, you'll 
have a 1-1 swr all of the time unless you can't get a deep null.

Bob, K8LR, [log in to unmask]

----- Original Message ----- 
From: "Jim Gammon" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, August 09, 2013 4:26 PM
Subject: Experience with Noise Bridges?


Not to be confused with LLOYD or Jeff Bridges.  I  am wondering
if anyone on the list owns or has worked with a noise bridge? I
would like to know how useful, and accessible they are and their
capabilities in determining resonance points for antennas.
Thanks and 73, Jim WA6EKS