I haven’t posted to this site in quite some time because I’ve been very busy with broadcast engineering projects. So I thought I’d take time out to do a few repairs on my Alinco DR-605 dual band mobile and share a few pics to show the improvements. I chose to start out by repairing the […]
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Calibrating a Leitz Seikkosha TM-20C Theodolite For Multiple Uses
Leitz Seikkosha TM-20C Theodolite Added to Equipment for Checking Towers for Vertical/Plumb, Pad Layouts, etc. Primarily for use in my broadcast engineering work, I recently acquired a Leitz-Seikkosha TM-20C Theodolite. Ironically, I found it on eBay and in the process of buying it discovered I was purchasing it from a fellow ham radio operator up […]
Demo of Custom Built Arduino-Based RF Power and SWR Monitor
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 […]
Helper Instruments PS 250 Power Supply Repair
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 […]
Oops — Repairing My Repair of a Kenwood IF-232C Serial Port Interface
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 […]
Testing the New IFR 1500 Inverter Board Before Installing the FET’s
Update to IFR Inverter Board Recreation Project
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 1500 Inverter Board Project
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 […]
Thanksgiving Wishes…
Here’s wishing you all a very safe and enjoyable Thanksgiving!
Ultrasonic Detection System – Detailed Article by KK4ICE
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 […]