Ed, As you are aware this kind of thing is commercially available but the cost for a ready built switch and Bias T is considerable. You prove with a little time and a few bucks in parts a great project that fills a big need can be easily created. I must say your presentation and workflow in the video is first class. Its like you have done this all your life. Thank you Sir for showing the true spirit of Ham Radio and doing so with much class and consistency. 73's ! Kevin WA5KW
Nice build. Phil AD5X has so many good circuits. I built his switch operated multi-impedance transformer for short vertical antennas, works great. He’s an elmer even if he doesn’t know it. 😊. 73.
Excellent! Thank you for your video. A very timely bias-T build, as I just had a cheap commercial one go bad (very noisy). I'll be building two of these ASAP.
That’s so cool 4nradio! I’m glad you found my video helpful. You’ll have to let me know how they turn out. Send some pics. My email is good on QRZ. -Ed W8EDW
@@edwhitney1862 Will do! I will be using mine for receive only, with Wellbrook magnetic loop antennas. I suppose I can reduce the voltage rating of the capacitors since there will be no transmit signals going through the circuit.
If you use RG8 size of coax. It’s only 1.37 ohms per 1000 ft (center conductor) and about .34 ohms per 1000 feet for the shield. So I am pretty sure you will have plenty of DC power at the antenna. Thanks for the nice comment! -Ed W8EDW
Great job Ed... appreciated... one question for you... does it matter which side of the capacitor, resistor, coil or varistor is connected. ie is there an in or out +/- side to these components?
