I love Crystal radios

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I love Crystal radios

Post by Resistance is Futile on Tue Mar 18, 2008 2:49 pm

My first one was a plastic box type with a slider control on the front and had a circle with a lightning bolt in the circle. I wish I had it now. Sigh. I will post a picture of one like it if I can.

Arrow Click here to go to the --> Xtal Set Society

Arrow Click here to see an --> FM crystal radio construction set

Here what my first Crystal Radio Looked like:
Top Pin is Antenna, middle pin was ground and bottom was Phone plug.
Remco brand
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Re: I love Crystal radios

Post by krystallo on Thu Apr 03, 2008 2:44 am

Hey Resistance.
These sets show up all the time on epay.

FWIW, I have been an avid crystal radio builder for the last 40 years.

My current project is the "Beach Baby" concept set. Details on Rap 'n Tap ,then I can comment over hear.

Also FWIW,my top end set ,the "K-3" is a 660/46 litz ferrite assisted air coil set,made from very high end parts (3x UTC A-27 broadcast quality transformers ,ceramic var caps,sound powered phones, etc, etc/blah,blah,blah).

It has an outboard AM broadcast transmitter available to to perk it up even MORE than it's very good barefoot performance.

de K

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Re: I love Crystal radios

Post by krystallo on Tue Apr 08, 2008 2:31 am

Just to add,my boss had one of these as a kid and he could only get one station that he DIDN'T like.

They are very cool LOOKING sets,but I'm not so sure about the circuit itself though. Just a very simple slider I think.

K

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Re: I love Crystal radios

Post by Resistance is Futile on Tue Apr 08, 2008 2:27 pm

I could get Two or three stations on mine. I was 12 years old in 1956. My cousin wanted to trade me for it, and I gave in. pale
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Re: I love Crystal radios

Post by fifties on Tue Apr 20, 2010 6:24 am

You've got a year on me, lol.

In '54 or '55 (can't remember exactly), my dad got me a Galena crystal and cat's whisker assembly on a small piece of Phenolic plastic, and a headphone. He strung up an outdoor aerial, and I was able to get two stations with it.
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Re: I love Crystal radios

Post by krystallo on Tue Sep 14, 2010 1:47 pm

Hey All,

I'm still pluggin' and still alive.My latest project is a tapped crystal set in a VERY old small wooden cigar box.I'm working on it in drips and drops as things allow.

K

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Re: I love Crystal radios

Post by ddelby82128 on Sat Oct 16, 2010 5:43 am

A few years ago I bought some junk transistor radios and parted them out. I used the knobs and tuning capacitors to build crystal sets. After about 10 of these made in different styles I found I was not getting any better reception and I did not know radio enough to improve on what I did. Nevertheless it was 'fun' experience. I did install a resistor in the line and that made the sound clearer and louder but not more stations.

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Re: I love Crystal radios

Post by krystallo on Wed Oct 27, 2010 7:10 pm

Hey DD,

The best crystal sets are built with air variable capacitors (ceramic insulated are best) ,optimized coils and good audio circuits.

They generally work better than pulled parts .I really like the Tuggle circuit.
K

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Re: I love Crystal radios

Post by Resistance is Futile on Thu Oct 28, 2010 2:39 am

I used to hook up a variable cap to a rocket crystal radio and improve selection. On Local stations I hooked up an audio transformer and 12" speaker and was in seventh Heaven, at least I thought so any way.

I wonder why its so hard to find the varible loop sticks used in those sets. Suspect
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Re: I love Crystal radios

Post by pawpawhunt on Mon Feb 25, 2013 8:33 pm

I too have built countless xtl sets but the bestone by far was a push/pull coil and 2 dioads. I still doun the head phones and listen in. I do live in an RF dead naborhood. but the little set still gets it done. Love them xtl sets!!!

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Re: I love Crystal radios

Post by Guest on Tue Feb 26, 2013 6:05 pm

When I was 4 or 5 my father brought one of these home for me. It was my ticket to a life in electronics.

http://www.oldradioworld.de/gollum/rocket.jpg

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Re: I love Crystal radios

Post by pawpawhunt on Thu Feb 28, 2013 8:45 pm

That is a grate website with pics and good info and sechematics. Grate job, who ever? Am curently working on what they call an emergengy radio. I would like to post some pics but I have not masterd the art of posting them as yet!! Will try to get some soon!

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Re: I love Crystal radios

Post by Bill Cahill on Tue May 14, 2013 3:26 am

I had that radio in Blue when I was 8. I never got mine working. Now, I know why. I needed to ground it.
It was a neat little radio.
I now have the first crystal set sold by Heathkit.
I think it was the first one my father built around me when I was four.
At that time, I wasn't interested.
I am now.
I need some old high resistance headphones so I can try it.
Bill Cahill

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Re: I love Crystal radios

Post by Brig on Sun Oct 06, 2013 10:29 am

Bill--Did you get your "old high resistance headphones"? If so, what are your results with the Heathkit crystal set?

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Re: I love Crystal radios

Post by Bill Cahill on Sun Oct 06, 2013 10:31 pm

Nope. Still no luck finding them. I am told these crystal sets play great, though.

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Re: I love Crystal radios

Post by Resistance is Futile on Sun Oct 06, 2013 10:36 pm

I JUST PURCHASED one of the rocket radios from ARF member. $40. Its either very weak or my hearing is now shot.Sad 
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Re: I love Crystal radios

Post by Ragwire on Mon Oct 07, 2013 10:12 pm

Here's another with pages on crystal radio DX http://www.oldradioworld.de/gollum/index.html
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Re: I love Crystal radios

Post by Alan Douglas on Mon Oct 07, 2013 11:06 pm

I haven't had time for crystal set DXing in several years, but when I did, the most sensitive phones were the sound-powered ones. I made a swap with someone who had an extra pair. They needed an impedance-matching transformer, which I luckily already had. Those were substantially better than the Baldwins I used before, which in turn were better than any ordinary headset.

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Re: I love Crystal radios

Post by Ragwire on Tue Oct 08, 2013 9:12 am

I'm not familiar with a sound powered headphone. How does that work?
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Re: I love Crystal radios

Post by Alan Douglas on Tue Oct 08, 2013 6:34 pm

They were used mostly on ships for emergency communications, as there were no batteries required which could go bad.  They were like Bell's original telephone, two identical transducers, where the voltage generated by one was enough to power the other.  They of course (unlike Bell's design) had to be extremely efficient to work. RCA and US Instrument made most of them.

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Re: I love Crystal radios

Post by Resistance is Futile on Tue Oct 08, 2013 7:43 pm

The main reason they were used is in case of enemy fire damaging the ships internal communications. They were referred to as squawk boxes, they used the ships hull as one connection and wire the other. They usually had a crank to make a loud squealing noise and switches to send to different compartments. No amplification needed.

http://en.wikipedia.org/wiki/Sound-powered_telephone
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Re: I love Crystal radios

Post by Resistance is Futile on Tue Oct 08, 2013 8:15 pm

Heres a demo:
https://www.youtube.com/watch?v=oIrIJNwuia4
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Re: I love Crystal radios

Post by Ragwire on Wed Oct 09, 2013 12:10 am

Cool!
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Re: I love Crystal radios

Post by Alan Douglas on Wed Oct 09, 2013 9:17 pm

The ones I use, look like any headphones (though I did use my own headband).  I recall the previous owner told me they came from a Mississippi tug boat. It's possible that mine were in a handset originally.

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Re: I love Crystal radios

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