Articles
Technical information
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Multi Products Model CM-1 Conelrad Monitor (Motorola DS9660)
Bob Heil's favorite radio is the Moseley CM-1 which the developer, John Clemmons, told Carl Moseley stood for Clemens Manufacturing number 1. "No", Mr. Moseley said, "That stands for Carl Moseley number 1!" As that may be, there's yet another CM-1 receiver and it was made by the Multi Products Company of Oak Park, Michigan. As wikipedia state... READ MORE |
ranickels 08/13/2020 |
Vintage Ham Radio |
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All Band Inexpensive 40 Watt Transmitter
Jay Miller KK5IM recently wrote an article in Electric Radio magazine about fulfilling his dream of building a homebrew "AM Kilowatt" transmitter (375 watts output by today's standards). His crystal-controlled exciter that drive the 813 was based on his Novice transmitter, which was built by his grand-uncle back in the 1960s when Novice class h... READ MORE |
ranickels 07/09/2020 |
Vintage Ham Radio |
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Bias control of Class E amplfiers
Micro SDR innovator Guido PE1NNZ has implemented polar modulation using an Arduino MCU and a class E PA. For more informartion on this fascinating project, join the discussion group at https://groups.io/g/ucx Initially, Guido's design implemented the polar or EER modulation scheme using modifications to the QCX CW transceiver hardware in the traditional way as described by... READ MORE |
ranickels 06/20/2020 |
Technical |
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Lysco "Transmaster" Mobile Transmitter
I'm always intrigued by the odd and unusual ham gear that I remember seeing in catalogs as a kid but have seldom seen after hundreds of hamfests and uncountable for sale listings. One such is the Lysco mobile transmitter which was produced by the Lysco Manufacturing Company of 1401 Clinton St. Hoboken NJ between 1949 and 1953. Despite being ... READ MORE |
ranickels 06/06/2020 |
Vintage Ham Radio |
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Class E Notes
There is a lot of misunderstanding about how a Class E amplifier works. As the result of studying the literature and experimenting, I thought I'd share what I have learned over the past several years. Below is an example of a test amplifier I used to optimize my 2 watt wspr transmitter boards. It can be visualized as ... READ MORE |
ranickels 06/06/2020 |
Technical |
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Postcard or Letter Radio
Seeing this article on Hackaday about how a guy in China made a crystal set using the diode in a chip credit card for the detector reminded me of the Postcard Radio. It was a project in the WWII-era "Boys Fun Book" that I had as a kid and although I remember it well I had no reason to build one because who would want to mail a radio to someone else? I di... READ MORE |
ranickels 06/04/2020 |
Vintage Radio |
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Communications Associates Inc. SSB-125 marine radiotelephone
What can I say, I like oddball radios! There was already a different version of this CAI SSB-125 on my shelf but it had the remote control head, and this one was cheap, well under $100 including shipping, and I'm easily amused. VIDEO DEMO HERE Communications Associates Inc. was a supplier of commercial, military, and marine radios based in Hu... READ MORE |
ranickels 05/14/2020 |
Technical |
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My $18.50 homebrew boatanchor receiver
The HW-16 had to be pushed aside while waiting for parts, creating an opening just big enough for the homebrew receiver I got recently via eBay for $18. 50 - plus 2X that to ship it here. I like saving and restoring old homebrew gear just out of respect for the amount of time and effort our forefathers put into making things from scratch, and this receiver intrigued me, as the IF tran... READ MORE |
ranickels 04/28/2020 |
Vintage Ham Radio |
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Boatanchor Garge Door Opener
The Multi Elmac Company of Hazel Park and later, Oak Park MI is best know amongst hams for it's great mobile transmitters and receivers which were probably the most popular rigs of their type and are still often used on AM today. The Multi Elmac Net pays tribute to these little rigs by and typically a half-dozen or more are heard on the net weekly. But the co... READ MORE |
ranickels 04/22/2020 |
Historic |
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Wireless on a Train
WHEN Frederick Wally stepped out of a little cubby-hole in one corner of the forward day coach on the Lackawanna Limited, west-bound, as it neared North Scranton, Pennsylvania, Tuesday, November 25, 1913, and pinned a sheet of paper on the wall, the passengers in the front seats, who had been casually wondering what caused the strange, crackling sounds that had been coming from the cubby-hole, pri... READ MORE |
ranickels 04/14/2020 |
Historic |
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