I got the matching network back on the bench tonight. I started by confirming that the Unun leads are as I expected. I hooked a 220 ohm resistor across what I thought was the high impedance side, and connected the Rx Noise Bridge across the low impedance side. I read very close to 50 ohms […]
Posts Tagged ‘Receiver Bridge’
Conditions were generally not as good this year as last. We found that the settings for the antenna tuner that we made last year were still completely valid. The only problem we had was when we had the 160 meter switch turned on for 80 meters at one point, which may have led to some […]
Once the electrical build and calibration were complete, I used Visio and Photoshop to create some graphics for the control panel. I also made a graph to convert what the dials say to actual values on the HF and 6-meter Ham bands.
The articles I was basing this design on said that it was beneficial to isolate the variable resistor from the case, to reduce stray capacitance that affects the balance of the bridge. So I used a piece of perf board, and some metal standoffs that I had in the junk box. You can also see […]
I found some 1/2″ aluminum angle stock that I used for the mounting bracket. I first tried to rivet it to the box, but the box’s shell was too thin, and the rivet wouldn’t pull tight enough, so I ended up using nuts and bolts (#6).