This video is a demonstration showing the RF Power and VSWR Monitor & Alarm System I recently designed and built. The front panel and chassis used to be a Glenayre Power Monitor panel, but after being completely gutted, retrofitted, painted, etc., it is now a custom Arduino-based build. I finished creating and putting the front […]
I finally got around to testing this Helper Instruments PS 250 Power Supply which was among some items given to me by a client. With the power supply set for 5 Volts DC output, the ripple was outrageous. Helper Instruments sold out to Zetron Corporation many moons ago, and this power supply hasn’t been in […]
A friend brought a Kenwood IF-232C Serial Port Interface to me a while back asking for a little assistance with repairing it. He had replaced multiple components in it but it still wasn’t working properly. When hooked up to a Kenwood TS-850 radio and a computer, the computer could not communicate with the radio or […]
The project of building in Inverter Board for the IFR FM/AM-1500 Service Monitor from scratch is moving along pretty nicely. At the moment, I’m simply waiting for a supply of IRF521 FET’s to arrive, at which point I’ll just have to add two of them to this board, reinstall the board, and test the machine. […]
IFR FM/AM-1500 Inverter Board recreation. The original board was seriously damaged when one of the IRF521 FET’s went up in smoke. I tried to patch it up and replace the burned out FET, but the board is pretty much a “goner.” The power supply is still getting “bogged down” with this board in place, and […]
Here’s wishing you all a very safe and enjoyable Thanksgiving!
I’ve received a lot of emails and messages asking for more specific details on how I built and utilize my ultrasonic RFI detection system. I put together a previously unreleased article which will provide you with exactly that, although it doesn’t include the recently built handheld, clear parabolic dish detector which I’ve built to replace […]
Don’t be surprised if conditions on all HF frequencies get very strange or poor at times today, due to solar activity: