Articles
Products and ideas to generate the frequencies we need
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Universal Frequency Converter
I found myself wanting to convert various frequencies to other frequencies and wanted a cheap and easy solution, so I designed a simple "universal converter" using the NE-602 and a programmable oscillator from Epson. I'd used the same combination in hundreds of "RANVerter" SDR Upconverter projects since my Dec. 2013 QST article and knew that while there were limitat... READ MORE |
ranickels 03/17/2022 |
Technical |
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Magnetic PCB holder
It's always a challenge to hold PC boards during assemly and testing. After purchasing a magnetic holder from Amazon I realized I wanted more and could easily make as many as I wanted using inexpensive 3 mm hardware from eBay and some strong "fridge magnets". All that's needed is to epoxy a standoff to the magnet - both tapped and threaded&nb... READ MORE |
ranickels 03/09/2022 |
Technical |
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Si5351 Quadrature Mode
The Si5351 has been the biggest boon to homebrewers since the invention of the NE-602, especially now that quartz crystals are essentially obsolete. But it's redundant to run the output of the 5351 through a johnson counter to develop the quadrature signals required for QSD/QSE SDR front-ends when there are three clock outputs available and the IC allows for phase offsets. &... READ MORE |
ranickels 03/09/2022 |
Technical |
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Some tips on the Johnson Pacemaker
It's pretty well accepted that the Pacemaker was not EF Johnson's finest effort. In fact it was the first of several failed attempts by the King of the AM Transmitters to make the transition to SSB. In the end, it was the rise of CB popularity that kept the company viable, along with its component business, while their ham business gradually faced away. ... READ MORE |
ranickels 03/03/2022 |
Technical |
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The William L. Howard Museum
LTC William L. Howard amassed a collection and in fact realized his dream of creating a museum that showcased the Army's technical intelligence operations - and a lot more. The following excerpt was written by Col. Howard and Todd KA1KAQ: William L Howard I first got interested in radio while a Cub Scout back in 1954... READ MORE |
ranickels 02/18/2022 |
Historic |
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Radio Belts
Some things you can improvise around, others - no way! And drive belts for radios are one of the latter, when one is broken or stretched to be unusable you need a new belt - but where to get it? Here's the answer: RADIO BELTS Many standard belts are shown but custom belts are no problem, just send them the information needed. A gr... READ MORE |
ranickels 02/14/2022 |
Technical |
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History of the Quartz Crystal Industry
Two excellent papers on the history of the quartz crystal industry. 1. A HISTORY OF THE QUARTZ CRYSTAL INDUSTRY IN THE USA With the aid of many of the people who were involved, this paper is an attempt to record the history of the quartz crystal industry in the USA. Although crystal units were in use at least a decade earlier, the beginning of the quartz crystal ind... READ MORE |
ranickels 02/11/2022 |
Historic |
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Adams-Morgan Co. radio parts catalog from 1915
Fascinating catalog from the "DigiKey of early radio" - the Adams Morgan Co. aka "AMCO" of Upper Montclair NJ. Download from the "Attachments" link below. ... READ MORE |
ranickels 02/02/2022 |
Historic |
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The 8122 Story
The following information is attributed to Jim Liles, K9AXN. Jim a long time user and expert on the Hallicrafters SR-2000 "Hurricane" with involvement going back to it's original production. His website www.k9axn.com contains a lot of valuable information and is recommended. RCA developed the 8122 which was also built by Burle, and later, Eimac ... READ MORE |
ranickels 01/22/2022 |
Technical |
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My Johnson "Five Hundred Desk" Story
Not a lot is known about Jacob C. Thomas, other than he was born in 1903 to John and Anna Thomas in David City Nebraska, and died just a few months short of his 90th birthday in the same town. And that he was a radio man. David City is a small town of 3,000 not far from my home town so it made sense that the auction notice would appear in the local newspaper where my Dad... READ MORE |
ranickels 01/22/2022 |
Vintage Ham Radio |
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