Відео

I definitely remember WOR. During my Army hitch at Ft Monmouth. The only station I listened to. GR8 music better choice than WABC AM 770. Familiar tunes and then they would play some deep cuts from somewhere. Nice sounding FM station. This was a GR8 video thanks

No, PVC is very low loss anything cardboard or wood is very high loss and lowers the queue tremendously. Even Glass is very bad.

thats wonderful.....

37:20 Is 2.5x Diameter really correct? Those look more like 2.5x RADIUS??? That would align more with the 'make them square' motto as well...

I majored in broadcast production at CSUN back in the 90's. Our broadcast history class never could go into this kind of depth, if the info was even readily available then. What a fascinating story.

Take lots of hassle and get a good 3d scanner and a SLP type printer will leave a smooth nice finish. The Filament printers not so much.

Melissa's presentation was awesome! 👍

I have to wonder if Tesla's fondness for pigeons had anything to do with their ability to use the earth's magnetic fields for navigational purposes.

David also played the part of Winston Churchill on the world stage. Imagine, Hitler was played by Walt Disney, Benito Mussolini was a part played by Douglas Fairbanks Senior, and Rose Fitzgeralds brother, Thomas Acton Fitzgerald played Roosevelt, and Truman was also known as Joe Kennedy Senior. Clowncracy rules supreme.

Wonderful presentation. Enjoyed it!

What about plastic?

if you get a standard pair of 2k magnetic headphones you can dramatically improve them by getting a modern strong niobium magnet and experimentally positioning it on the back of the earpiece.

Every time I think I understand crystal radios pretty well, I watch something like this and realize there's even more for me to learn. Thanks so much for posting this!

At 57:44, your motivating making smaller and cheaper radio by the Depression. It is surely a good reason. But certainly not the only one to consider. In the mid-30’s, it is radio golden age. Listening is not just a living room thing in family. Radio is a all day affair from then on. The wife follow the soaps, the husband the news, etc. You need a radio in the kitchen or in the shop, the office, the barber shop, etc. So there was a need for a second radio. Same happened eventually with TV. You would have smaller and cheaper TV so you could watch the game in your shack or else. So, it was also a business opportunity and it worked!

This is too advanced.

On a lark this came up in the algorithm. Really great presentation and brought back some memories. I had made a crystal radio after following many designs and improvements from the "braindead" one. I was fortunate enough to have a great antenna and ground. Listening in the winter after dark from eastern Canada I was able to listen to a Washington Capitals hockey game!

Thank you so much , I grew up in the 1970's as a boy these were at the Local Confectionary and the five and dime . Sears , Radio shack etc. . I wish that more youngsters today Used and Understood the fun of all of this and building on the Technology , Thank you , Liked and Shared :) QC

The 3DQ also sounds better because it is turned on for a greater portion of the wave cycle.

22:04 neuralink, coming soon. ;p

And then there is Mike Tuggle and his Liondyne Super Set !

I have to wonder, to what degree is the pocket protector an ironic accoutrement or does he use it completely unselfconsciously.

7:58 OUTSTANDING! This is precisely why I love the old books and equipment. So many rich lessons and possibilities that are lost in todays equipment.

Absolutely, a metal bed frame, the kind with springs, is a real good crystal radio antenna.

The best i have is my Dad's, w5ewf (sk ) set. Dual pancake tuned circuits and taps on last rf and first rf coils plus hi z to low z phone socket via transformer. Detector also drove a 10 uA meter with sensitivity pot. In Chicago suburbs had to use that pot to keep from WGN burning out meter. Even better in Jefferson City, MO with a 240 ft wire 60 ft up. Amazing tuning indicator. Only time i have seen a meter on a xtl set. Takes a while tune in a station. Headphone vol with my old hi Z phones could be heard 10 ft away. Got stations across midwest,Texas, Mexico and Canada. Even NYC late. Still have it. Doing regens at moment, but going back to pretty up Dad's set soon. QTH in west cent FL now. 73 karl wa2kbz

Always fascinated with crystal ' no power ' radios. I had a schematic for Crystal set that used a transistor to slightly amplify the output where the transistor was powered by input signal. I lost it, I haven't seen any others. The fellow that goes by ' glasslinger ' on youtube who makes vacuum tubes was building a crystal set that was amplified by two 6AU6 tubes and it worked really good. The crystal receiver part seemed extremely sensitive as he drove across the dial ( variable capacitor ) and tuned in at least four totally separate stations. I don't know what the circuit was called but it had variable volume control between antenna and coil similar to circuit on my 34 Philco radio.

Well I guess I have another project...

questions should be asked under a microphone for our pleasure tohear.

AFAIK, _"Sound Powered Phone"_ systems are still used on US Navy and US Coast Guard ships and cutters. I was in the USCG, and for about my first two years in was stationed aboard a Cutter. They employed both the headphone/microphone devices {which I never used}, and the telephone handset devices which I did use on occasion. I was also in the USN before the USCG, but was never aboard any Navy vessel {I did Aviation..👍}.

This is a masterpiece. A radio history must.

I heard the phasing fiasco. My God. I called the station. They admitted the problem. But suggested it was a tape cart problem.

You are correct abut the Young Sound. The announcer was as warm as a staff ash tray in the employees lounge. This review is a treasure trove for those of us who worked and loved radio.

10/9/23 Crystal Radios. Thank you for your presentation on Crystal Radios. I built several of them in elementary school and purchased one of those rocket crystal radios. I loved your ideas on impedance, matching and wish I would’ve known about that when I was building them as a child. I started in Radios, when I was four years old toddling behind the Sears Silvertone TV that my dad bought in 1954. I was trying to see how howdy Doody got in my TV. I knew he came in through the rabbit ears on the top since I had to twist it all around to get a good signal. when I look through the holes in the fiberboard on the back and could see glowing orange things. I figured those must be responsible for putting howdy duty on the screen. By eight years old. I understood how tubes worked and by 12 I had my radio amateur license WN6INX And that time I was living in San Diego & sending Morse code and receiving QSL cards from across the United States &South America using a homebrew transmitter with 6146 output tubes and a converted arc5 world war II airplane receiver. Also using a long wire dipole antenna that could be tune to the 40m and 80m amateur band.

that baldwin headset looks like you could clip an amp on the line, and it’d work as poor quality mic. 😮 like, talk into the earpiece. 😅

Notwithstanding that these things can be made to pick up FM, I shouldn't think there'd be much point to making a crystal set as a kids' (or grown ups') project these days, where I live (Rep. of Ireland), as, sadly, AM broadcasting is deader than flares! I did actually make one of these as a kid (under the direction of my 'nerdier' buddy, who had at least some kind of idea what he was doing. In order to skip all that tedious winding, we used some kind of coils salvaged out of cars; I don't know whether it was an ignition coil or an alternator coil, not really looking like either, but it looked like one of those toilet roll - core jobs. Perhaps it was one of those RF suppressor coils, which would have been mildly ironic, I guess! Do cars even _have_ those, any more? Probably to the surprise of no~body here, wherever I would clamp on to it, I could only get the one station; but to be fair, that was a pirate station less than ½ a mile up the road putting out on 5kW, and which was known to come out over the Tannoy in the local church - you can imagine; "We believe in God, the Father Almighty, Creator of *>`krsstk!’<* --- Yeah, you're listening to Mike St. Cool, here on E____ , where we play _all_ the hits, _all_ the time..!" (Actually, in retrospect, we probably would have stood a good chance of picking them up with any more or less random collection of components!) Perhaps someone could answer a question for me, though; I lived just behind a big hill, which meant that even though I was only 5 miles from a city of 150,000, I couldn't get a single FM station. On the other hand, the same hill likely provided a good deal of protection from lightning. Nonetheless, even if only as a matter of 'range discipline' (if I can use a metaphor), was it wise to employ a long wire aerial draped over the roof of the house, especially during thunderstorms? My set was earthed to ground spike that barely went a foot into the ground, for whatever that may have been worth..! It's probably common sense not to use such a radio during electrical storms (even though I used to routinely sleep with the earphone in my ear!) Maybe, though, at the first tell - tale burst of static I should have been throwing the radio end of the wire out of the window - as far from the house as possible?! It strikes me that now, as then, this might be an important consideration for _anyone_ intending to use an outside aerial with a crystal set - or would they be worrying over nothing?

Pls refresh my memory: why transistor radios dont need grounding and crystal sets do. Thanks.

I built my first crystal set when I was 8. I used a germanium diode. The coil was experimentally wound. I bought the variable capacitor from a local repair shop I later worked at as a an after-school job. I lived in an area with a single AM station and nothing else for over eighty miles.

Was the gun that was used NOS?

Bravo 👏 Bravo! Absolutely fabulous information. I smiled for 30 minutes.. microprocessor indeed.. that made me laugh. Thank you Jules :)

I use a double sided tape on several places parallel to to axis of the coil to help to fix the wire while I am making the coils and after that I use nail polisher along the line parallel to the axis to hold the wire.

When I was a boy I grounded my crystal radio on the electric outlet neutral (there were no 3 pins electric outlets then). I tried a band-saw partially buried on ground, too and I discovered a few volts difference between the two. Took me a while to understand why. It was a nice learning. And yes you are right my crystal radio could only receive a an FM radio that was very powerful. Yes they can receive FM too putting them a little out of tune to transform FM on an AM signal on the edges of the cutoff of the LC tuner.

Sooooo did I miss antenna talk, ?

My electronics career started in 1951 with a Cub Scout Radio kit. Catwhisker and a half inch wide strap slider across the tuning coil. Not successful. Ended up building a set with a double gang cap, two loopsticks, inductively coupled, with added windings for the antenna and detector (1N34). Telephone operator headset much more sensitive than surplus headsets of the time. listened to WWL from 300 miles away when local WDDT went off the air at night. KK6IL

My dad's family had one. It was built the year he was born. I received it as an inheritance. So great to see this video. Thanks for posting!

ruined by all the Emms

Great

Cool record Bob. I looked up my name and apparently I'm a judge in Dallas, TX, lol.

A great primer on crystal sets, with quite a lot of detail for those wanting to take it further. Thank you for telling folk not to bother with the really simple beginner circuit where both the antenna and diode detector are connected to the top of the coil. That circuit alone must have been responsible for so many people completely writing off crystal sets as a mere novelty. Great talk. Thank you Al!

AR-88 question: Did the Soviets ever try to clone them? I know the Soviets cloned several of the 1930s RCA ham receivers like the AVR-1, AVR-5, and ACR-136.

Really good thanks!

Excellent....UA-cam is a miracle!