Heathkit Cr-1 Crystal Radio Manual

1. Crystal Radio Theory
2. Heathkit Manuals Download

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Rebuilding my Heathkit CR1 and getting it to work I can not really remember when or how I came by this little radio, but it was many years ago. I seem to recall that I picked it up cheap at a thrift store as a non-functional item that had been poorly or incompletely put together. I remember that some of the screws and a connection post was missing and the parts weren't soldered in properly or correctly. To tell the truth, I didn't know how the radio was supposed to be wired and I must not have been very interested in getting it working, so it sat in a cabinet for several years until a year or so ago.

Crystal Radio Theory

My CR-1 crystal radio modified for two earphone jacks. About a year ago I came across the little radio and decided that I would figure out how it was supposed to work and then I'd put it together correctly. The first thing I did was put a sub-miniature phone jack in place of the missing binder post since my piezo earphone has a sub-miniature plug on it and besides, I didn't have a matching binding post to replace the missing one. I took off the grounded binding post and put a screw to cover the hole. Next I soldered the antenna tuner coil to its variable capacitor and wired the two fixed capacitors to the selector switch.

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Heathkit Manuals Download

I then soldered the station tuning coil side to its variable capacitor and from the tap on the station tuner coil, I soldered a 1N34 germanium detector diode to the phone jack. Actia usb com board evolution driver. By the way, Heathkit called the tuning capacitor connected to the station tuning coil the 'detector tuner' and on the panel it is labeled as 'DET' for detector. Back side showing the radio's components. The antenna and the station tuning coils are wound on the phenolic tube. The antenna coil is to the left of center. A powdered iron (ferrite) slug is inside the tube between the two coils. When I finished soldering everything in correctly, I connected the little set to my antenna & ground and soon I could clearly hear my local AM stations, but I noticed that the tuning dial seemed to be way off.

At the very top of the AM dial (around 1600) I know there is a very strong Mexican station, but I couldn't go high enough to tune it in. Full house plans download. To match the dial with the AM band, I took a thin wooden stick and gently pushed on the ferrite slug in the coil form until it was nearly centered between the two sets of coils.

Ndrive maps torrent. By moving the slug, I was able to match the dial to about where I knew my local stations were and was able to hear the Mexican station near the top of the dial. The slug is held inside the tube by wax and if you are careful and apply slow, even pressure, the slug will move to where you want it. I now had a crystal radio put together as it should be and it worked -- sort of. Below is the schematic diagram I developed for the little radio. I'm kind of big on schematic diagrams, but I wasn't always so.

In many respects, this design operates on similar principles to the 'Trench Radios' of WW 1. Military radios of that day, such as the US Army's BC-14/SCR-54, also used antenna tuning, light coupling between stages, a tuned diode section and they operated on the same range of frequencies, 550-1600 KHz. I understand that these kits were very popular with Boy Scouts and were marketed as a kind of a 'Survivor's Radio' during the worst parts of the 'Cold War' when my government's Civil Defense planners expected an Atomic War with the USSR to break out at any time.

With only a few CONELRAD stations on the air and with us few survivors trapped in 'bomb shelters' for months and years, with our entire civilization and economy wrecked, still, news and information would be available to any doomed citizen having one of these radios, even though there was no electricity and the battery operated radios had all gone dead. Doesn't that sound cozy? Doesn't that sound like fun? Well, at least we would be 'better off dead than red' and, being dead, we'd not have to 'live under godless communism.' Oh, weren't the 'Good Old Days' just wonderful?!?