Last edited by err ducks on Aug 3:00 am, edited 1 time in total. Build one to see what they experienced.Īs you struggle to get a rusty razor blade and pencil stub to work. To recreate one in thier honor with their service and sacrifice on your mind is a noble thing. They were rude crude devices for men that were starved to hear "anything" other than the noise of war. They took this knowledge to war and did with what they had. For a lot of their families a "storebought" radio was out of the question so they built their own. Remember that these young men grew up in the early days of radio. Since the hardest bit to come by was a variable capacitor, you can bet your last dollar that a lot of them had a way to vary the inductance of the coil to tune them. They were built out of what ever they had at hand. There is no "representative" foxhole radio. Pretty much just a coil, razor blade and safety pin/pencil stub "catwhisker." Foxhole radios were built by GIs in World War II from materials they had easy access to in the field. Since I've never been able to find a photo of a real one from the day this article is as close as I can get. few minutes building your own foxhole radio. I'm trying to make one a close in authenticity to the ones actually used on Anzio beach as detailed in a magazine article of the time. From there I can calculate the actual number of turns on my size coil form needed to achieve that amount of inductance. So you see my problem? I need the actual inductance needed on a coil, of any size, that will give the best performance in a foxhole radio. Here are some examples:Ĭoil length: 3.25" (length available for wire on 4.25" tp roll) After plugging in the more common numbers I find that the actual inductances vary wildly. Here's the problem with that: after reading everything i could find on FH radios and checking out all the plans, I find that they all differ in the size and turns of the coils. I did, indeed, try working backwards using the coil calculator before asking this question.
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