HEATHKIT CR 1 HOW TO
HEATHKIT CR 1 PDF
HEATHKIT CR 1 PLUS

Works better than it “sounds”.You could make it completely waterproof (less the earphone) by squirting a small blob of clear silicone “liquid nails” or hot glue into the ends of the heat shrink tubing to fully encapsulate it.

HEATHKIT CR 1 PLUS

Plus a ground connection consisting of a metal tent stake or bayonet stuck into the moist soil. This one is REAL basic – but impedance matching and having a healthy signal are the keys to performance.All that was then required was a long piece of wire for an antenna (that barbed wire fence with wooden posts or a length of infantry telephone “commo wire” was perfect). Experiment with the circuit – you can “short out” coil turns with the paper clip tuning tap better yet, you can just connect the tap to the razor blade/earphone circuit instead, a more common configuration. This served to “build up” the antenna signal to a level that could be heard in the earphones by a process known as “detection”.An attached coil of enamel-insulated wire wound on a piece of bamboo acted along with the antenna wire capacitance to produce a tuned circuit, tuned approximately to the radio frequency band of interest. This served the purpose of the “crystal” and “cats whisker” of early crystal radios it permitted current coming in from the antenna to flow in only one direction. These were the “Blue Blade” type that had a blue oxide finish, and that finish, in contact with an ordinary pencil “lead”, made a point-contact rectifier.

The omnipresent Ham Radio operators in the Signal Corps probably helped, applying their skills of the day.I built the Fox Hole Radio described below after a friend produced a WWII Red Cross package containing razor blades among other common items. I’m not interested in those things, but I digress).This was early 20th century technology and any self-respecting GI was up on it. They were the equivalent of today’s techno-geeks and computer hackers (but not the modern kid who thinks “communications technology” is poking their finger at the screen of a Chinese-made iPhone.

HEATHKIT CR 1 HOW TO

The radios were built by the young GI’s who just knew how to make such things. That perforated Messerschmitt or Betty could also be a source for the necessary wire for the antenna tuning coil and antenna. Bookmark this site.įoxhole Radio Photo: AFRTSThe radio could be built from basic scrap, with the exception of the earplug or earphones those could be liberated from that enemy tank or aircraft wreckage. The rest of this site is great too, includinga foxhole radio design by Lance Bordenhas many of these links and links to a lot of antenna building sites, andthen some. Both salvagedbefore Gnome Technologies reformatted their site. Super Wenzel Associates, with some new stuff on diodes addedA nice site worth visiting,then visit Ian's very fine site.hastoo-simple xtal set plus one with an op amp boosterAustralian college electronics course page.What the heck, go to the index and take the whole radio course:Adventures in Cybersound.

HEATHKIT CR 1 PDF

Nice detailed pictures on their progressive project.Also has the simplest AM transmitter you'll ever find.has some neat xtal set projects, witha bit of humor thrown in.has a QST crystal radio project you can download in PDFdetailed pdf instructions for a classic om Queensland Australia - beautiful rigs, and plans for the prize winningMystery Crystal Set (the rage in 1932).some more notes on the original by Kenfinally found a new home.

Heathkit cr 1