Have you ever wondered what good one of those -100 “R X Noise Bridges” could do for YOUR station setup? Are you baffled by your antenna tuner or “transmatch”? The 1051 is easy to build and super-easy to use. No “R-X” controls, calibration or calculations needed. Just connect it between your rig and antenna tuner, set receiver to desired operating frequency, and adjust the antenna tuner until the distinctive modulated pulses (NOT just straight “noise”!) drop to an easily-recognized “null” indicating that the tuner offers a 50-ohm match to your transceiver with NO on-the-air nervous experimenting with the tuner controls! We recommend (undrilled, no holes) enclosure TPx-15 for this item.
Posted by Glen Gardner on 26th Feb 2012
This kit is a great value for the money. It works exactly as described.
There is one caveat:
In some ssb radios the fast rise time of the 700Hz modulating pulses generates rich harmonics that are stronger than the desired white noise. You end up with a "signal that peaks and can not find the dip without considerable attenuation between the radio and the noise bridge.
Shutting off the AM modulation fixes this.
To shut off the 700 Hz am and keep the 1 second pulses working do the following:
1) When building the kit install a 14 pin dip ic socket so that you can remove the timer IC.
2) When installing the timer IC, bend pin 9 up and away from the socket so that no connection is made at pin 9.
3) Set r6 to the middle of its rotation and do not touch it again, ever.
4) On the foil side of the board create a solder bridge between pins 9 and 10 of the timer ic socket.
5) It will now work with a lot less ambiguity on SSB/CW.
Posted by Unknown on 3rd Oct 2011
This is all built and working great now. I'd give it five stars but for the pretty flimsy circuit board...be careful with the heat...even with a temp controlled iron and a fair amount of kit building experience the printed circuit on this delaminated from the board in a couple of spots on me...not a case of one overheated joint...with some care I kept it from decomposing and got it working well despite all...but it is an issue.