Eric's "Crystal Radio Initiative" Challenge

[wayne.ct]

This is out of my league

Correcting my error and still using 750 KHz as my center frequency, this is what I get...

Calculation #1

L = Total length of coiled wire

L = c/w = 299,792,458 (meter / second) / 2 * PI * 750,000 (/second)

= 299,792,458 / 2 * 3.14159 * 750,000 (meters) = 63.62 meters = 63.62 meters / .3048 (meter / ft)

= 208.7 feet

Calculation #2

L = Length of each turn = 208.7 feet / 20 = 10.44 feet = 10 feet 5.23 inches

Calculation #3

Circumference C = L; Diameter = Circumference / PI = 3.32 feet = 3 feet 3.86 inches

H = Coil height = 0.2 * Diameter = 0.2 * (10.44 feet / PI)

= 7.97 inches

Calculation #4

Max diameter of wire. Space between strands of wire is 62 percent of wire diameter.

20 turns take 7.97 inches ===> 1 turn takes 7.97 inches / 20 = 0.4 inches

0.4 inches = 162 percent of wire diameter ===> 100 percent of wire diameter = 0.4 / 1.62

Wire diameter = 0.246 inches (max.)

AWG 3 has a diameter of 0.2294 inches / 5.83 mm.

AWG 3 has resistance of 0.646 ohms / Km. which is 0.197 mOhms / ft.

For 208.7 ft, the coil will have 395 mOhms or 0.4111 Ohms resistance.

Now we have a manly sized inductor! 'Sorry to say I will not be building that any time soon! Thanks for the ride!

At the same time, my intuition was telling me this was going to be a large coil. So, I feel a bit better knowing my gut was in the ballpark.

[Sebacid]

Correcting my error and still using 750 KHz as my center frequency, this is what I get...

Calculation #1

L = Total length of coiled wire

L = c/w = 299,792,458 (meter / second) / 2 * PI * 750,000 (/second)

= 299,792,458 / 2 * 3.14159 * 750,000 (meters) = 63.62 meters = 63.62 meters / .3048 (meter / ft)

= 208.7 feet

Calculation #2

L = Length of each turn = 208.7 feet / 20 = 10.44 feet = 10 feet 5.23 inches

Calculation #3

Circumference C = L; Diameter = Circumference / PI = 3.32 feet = 3 feet 3.86 inches

H = Coil height = 0.2 * Diameter = 0.2 * (10.44 feet / PI)

= 7.97 inches

Calculation #4

Max diameter of wire. Space between strands of wire is 62 percent of wire diameter.

20 turns take 7.97 inches ===> 1 turn takes 7.97 inches / 20 = 0.4 inches

0.4 inches = 162 percent of wire diameter ===> 100 percent of wire diameter = 0.4 / 1.62

Wire diameter = 0.246 inches (max.)

AWG 3 has a diameter of 0.2294 inches / 5.83 mm.

AWG 3 has resistance of 0.646 ohms / Km. which is 0.197 mOhms / ft.

For 208.7 ft, the coil will have 395 mOhms or 0.4111 Ohms resistance.

Now we have a manly sized inductor! 'Sorry to say I will not be building that any time soon! Thanks for the ride!

At the same time, my intuition was telling me this was going to be a large coil. So, I feel a bit better knowing my gut was in the ballpark.

You can always use another frequency (higher), then the coil, wire etc. size will be smaller. Try for something in between 2000-3000Kc/sec? As Dr. Green said earlier, the idea is to magnify the chosen frequency to the max!

Don't give up, build a smaller one first, experiment on it and if succesfull, upscale it on the next one!

Cheers,

-Seb

[Sebacid]

Wire?

Does it matter if I use insulated wire for the winding? Or is it better if it was copper?

[orgonaut314]

Does it matter if I use insulated wire for the winding? Or is it better if it was copper?

Every insulation will increase the self capacitance. Now I think it was better to keep that one low as possible.

Apart from that be careful with the material you use. If there is Orgon than organic materials like wood or materials like coper are preferable. In another type of research we found out that Orgon does become sickening if you use the wrong materials that your body does not like when you would eat or drink them. I would be careful with pvc that contains chlore. Even the thin insulation on the coper wire might be wrong. But this is only important if you want to make a coil that does not make people get an head-age.

[Jeff Pearson]

I was experimenting with crystal sets last year
Was listening to clear channel stations 2 states away at night with crappy antenna. Powered piezo headset i made. no power source for radio except radio waves. I learned a lot doing this. was gonna try ground antenna next Harris Rogers style.

[parkham]

I hope this isn't a completely question - When he says "Total number of turns", Given 20 - what does he mean by 20? Would that be 20 turns per inch?

The same for the next formula, "Given 20%" What exactly does that mean as well?

Please pardon my ignorance. I've got all the components together to start on a crystal radio - I want to fully understand before proceeding though.

Thanks,

[dR-Green]

"Total number of turns = 20" means exactly what it says. 20 turns in total on the coil.

The 20% is in reference to the height/length to diameter ratio of the coil. The coil is 20% high as it is wide. If diameter = 100cm then height = 20cm.

[Sebacid]

Would you agree that the smaller Ø the acrylic clear and hollow tubes the better?

[Aaron]

crystal radio initiative book updated

Book for Crystal Radio Initiative page 20 & 21 has been corrected and is available at same download link.

[LeeBob84]

Crystal radio initiative

I have been working on a large coil for the crystal radio initiative. This is a few pics of it
image.jpg

image.png

Frequency : 800khz
Coil diameter:4'10"
Number of turns: 18
Wire length : 247'
Coil height:14.4"
Wire diameter : 0.5"

I made a hemisphere from copper pipe, with a 16 point aluminum star as my top load. All that is left is to bury my 4 a/c radiators as my ground, wrap a 12" by 2 turn secondary coil on the bottom and build my resonant capacitor. Hopefully I can tune it up to receive some usable energy. U can follow me https://youtu.be/HyRhUStqzt4 , https://youtu.be/jncwulYUpV4

[Aaron]

Live call with Eric

That's great LeeBob!

If you have any questions for Eric, we have a live call tomorrow:
This coming Sunday the 27th at 11AM Pacific Daylight Savings Time, we will be having a LIVE Q & A call with Eric Dollard.
Conference Dial-in: 1-857-232-0155 and Conference Code: 582590 – It will be recorded in case you cannot make the call.

I have been working on a large coil for the crystal radio initiative. This is a few pics of it
[ATTACH]16937[/ATTACH]

[ATTACH]16938[/ATTACH]

Frequency : 800khz
Coil diameter:4'10"
Number of turns: 18
Wire length : 247'
Coil height:14.4"
Wire diameter : 0.5"

I made a hemisphere from copper pipe, with a 16 point aluminum star as my top load. All that is left is to bury my 4 a/c radiators as my ground, wrap a 12" by 2 turn secondary coil on the bottom and build my resonant capacitor. Hopefully I can tune it up to receive some usable energy. U can follow me https://youtu.be/HyRhUStqzt4 , https://youtu.be/jncwulYUpV4

[LeeBob84]

That's great LeeBob!

If you have any questions for Eric, we have a live call tomorrow:
This coming Sunday the 27th at 11AM Pacific Daylight Savings Time, we will be having a LIVE Q & A call with Eric Dollard.
Conference Dial-in: 1-857-232-0155 and Conference Code: 582590 – It will be recorded in case you cannot make the call.

Thanks Aaron,
Unfortunatlly I missed that call with Eric, Where would I be able to listen to the recording of the call?

One question I did want to ask him was about using a ribbon conductor supposed to the traditional round wire conductor and if there were significant differences calculating for it?

[Aaron]

Crystal Radio Initiative

Thanks Aaron,
Unfortunatlly I missed that call with Eric, Where would I be able to listen to the recording of the call?

One question I did want to ask him was about using a ribbon conductor supposed to the traditional round wire conductor and if there were significant differences calculating for it?

The recording is on his site embedded as a youtube video.

What do you need to finish your project in terms of parts and funds?

[LeeBob84]

The recording is on his site embedded as a youtube video.

What do you need to finish your project in terms of parts and funds?

Wow that is awesome thanks Aaron.I have the primary and secondary windings wound, and have been trying to get a good ground system put in. I am living in a rental house at the moment so my original idea of digging four large holes with radiators buried in the yard is a no go. So i have come up with the idea of pounding holes about 4 to 6 feet deep with a 1 inch piece if pipe then removing the pipe, feeding a piece of 4 gauge copper wire to the bottom and pouring molten aluminum down the holes till they are full. I have finally completed mt foundry and poured about 3 pounds of aluminum in the first hole. My biggest hold up now is trying to come up with funds to buy scrap aluminum and fuel for my foundry. I figure that i will need a total of about 75 pounds of aluminum and probably 100lbs of propane to finish. Any Help with that would be more than appreciated. Also I am in need of a good adjustable capacitor for this project to.
IMG_3886.jpgIMG_3887.jpgIMG_3888.jpgIMG_3895.jpgIMG_3889.jpgIMG_3890.jpg
Thanks again
Let me know

[Aaron]

cri

Wow that is awesome thanks Aaron.I have the primary and secondary windings wound, and have been trying to get a good ground system put in. I am living in a rental house at the moment so my original idea of digging four large holes with radiators buried in the yard is a no go. So i have come up with the idea of pounding holes about 4 to 6 feet deep with a 1 inch piece if pipe then removing the pipe, feeding a piece of 4 gauge copper wire to the bottom and pouring molten aluminum down the holes till they are full. I have finally completed mt foundry and poured about 3 pounds of aluminum in the first hole. My biggest hold up now is trying to come up with funds to buy scrap aluminum and fuel for my foundry. I figure that i will need a total of about 75 pounds of aluminum and probably 100lbs of propane to finish. Any Help with that would be more than appreciated. Also I am in need of a good adjustable capacitor for this project to.
[ATTACH]17235[/ATTACH][ATTACH]17236[/ATTACH][ATTACH]17237[/ATTACH][ATTACH]17238[/ATTACH][ATTACH]17239[/ATTACH][ATTACH]17240[/ATTACH]
Thanks again
Let me know

Please email me at info at emediapress dot com and copy and paste your message here to me - I can help.