Articles
Schematics & Manuals and other reference material of interest.
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EIA Codes - a clue to "who made what"
Although Source Codes ceased with the 2001 edition, it is available here for historical purposes. The EIA Source Code is a numeric symbol that was assigned and registered by the Electronic Industries Association (EIA) that could be stamped or marked on any or all products to identify the production source or the vendor assuming product responsibility.In addition, the EIA code provided for adding ... READ MORE |
 W9RAN 11/311/2023 |
Tech Library |
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David Gleason is an unsung hero
While working as a Univision programming and research exec in the early 2000, David Gleason began digitizing publications about the radio and TV business and posting them on his personal website so that he could easily share them as he traveled around and met with station staff. It was helpful in persuading the locals to take his advice, he says. “Rather than it just sounding like my opinio... READ MORE |
W9RAN 10/302/2023 |
Tech Library |
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Ballast Tube data and substitutions
Here's some information that isn't often needed, but difficult to find: A. P. Jacobi's Ballast Tube Handbook and Substitution Guide. Download from the "Attachments" link below.... READ MORE |
W9RAN 08/234/2023 |
Tech Library |
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Electricity Explained
We've heard there is some confusion about how electricity works. This should clear things up.... READ MORE |
W9RAN 08/214/2023 |
Tech Library |
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DIY Layout Creator
If you're like most homebrewers, often times you just want to build a one-time-only circuit and end up with a haphazard layout or one you have to tear apart and start over on to get everything to fit. DIY Layout Creator is designed for just this purpose! Not only do you get a layout that will work but a document that shows what you did so when you come back to it 3 weeks ... READ MORE |
W9RAN 05/125/2023 |
Tech Library |
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Minimalist QRP Book by IZ3AYQ
Everyone probably remembers building - or at least thinking about building - a small simple transmitter or receiver from an article in one of the radio magazines. They may not have used the term "minimalist" back then but the idea was the same - no frills, just a simple rig that could be easily assembled and was capable of being used on the air. Nowadays, QRP opera... READ MORE |
W9RAN 04/105/2023 |
Tech Library |
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Phillips Tube Substitution Guide
Ever run into a weird tube in a foreign-made radio, maybe one with an EL or EM part number? This 1965 cross reference from one of the largest tube manufacturers in Europe might help. Download it from the Attachments sectio below.... READ MORE |
W9RAN 02/56/2023 |
Tech Library |
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What is Q?
What is Q? A concise definition: "In physics and engineering, the quality factor or Q factor is a dimensionless parameter that describes how underdamped an oscillator or resonator is. "We know it's important in RF circuits - low Q coils or tuned circuits will result in loss and perform inefficiently. We may remember from the Handbook that the Q of a coil equals the ... READ MORE |
W9RAN 02/52/2023 |
Tech Library |
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101 Electronic Circuits
Most hams and hobbyists got their start in homebrewing by building simple circuits published in the various magazines. Every so often most of them could collect a bunch of popular circuits and combine them into a book - Sams, TAB Books, and the magazine publishers among others. Here's one from Gernsback, the publishers of Radio Craft magazine that is nicely organize... READ MORE |
W9RAN 01/05/2023 |
Tech Library |
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Triad transformer archive
In an era when many legacy companies seem to have forgotten their legacy, or have been bought out and remnants of their vintage past have been scrubbed from their websites, it's nice to see a company that does just the opposite. Triad Transformers has been around since 1943 and embraces its past, as a supplier that powered everything from Leo Fender's guitar amplifiers to the Apollo mission... READ MORE |
W9RAN 05/125/2022 |
Tech Library |
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