Peter, whatever happened with Eric P. Dollard?

[Kokomoj0]

i just finished the frame forms for the coils tonight. I found that pegboard and dowels make a great substructure, I also wanted the form to be round so I used lawn edge forms, it's a fiber board strip 3" wide .2" thick and comes in 50' rolls. forming that around the pegs will give a nice round base to work on. I'll get some pics up on the yahoo groups in the next couple of days.

which one are you building the crystal receiver or transmitter?

[Web000x]

When I spoke to Eric yesterday, he was inquiring about some ham radio so that he could have some form of communication aside from the payphones. Is there anybody out there that can locate a working PRC-47 for Eric?

Also, he asked me if I had received any of the material that I had requested from his friends, Hal and Stephan. This material consists of a 300+ page book that Eric calls his "RCA book" that I think documents Eric's adventure into the works of Nikola Tesla. Hal will not seem to release the book for whatever reason. He even stopped responding to my emails. There are also some San Francisco Tesla Society lectures that Stephan has that were supposedly going to be mailed to me but that still hasn't happened even after multiple times of saying "Sure, I'll get those in the mail". I post this in hopes that Hal or Stephan will read this and make something happen. It is a damn shame to see people sit on this type of material...

Does anybody have 30 to 40 acres in Arizona or California that would be willing to let Eric use it as an antennae field?

Dave

[Lambda]

Eric's PRC-47 Request

When I spoke to Eric yesterday, he was inquiring about some ham radio so that he could have some form of communication aside from the payphones. Is there anybody out there that can locate a working PRC-47 for Eric?


Dave

Hi Dave,

I am unable to locate a PRC-47 online anywhere for Eric or I'd attempt to spring for it, in hopes that it even works... I doubt Eric will accept it, but ask him if he will accept a Kenwood TS-50, it is a good mobile HF rig with 100 watts PEP, does USB, LSB, AM, & CW of course. If he is ok with that, what else will he need, tuner, dipole, vertical 40m hamstick? I hope he will accept the TS-50, since even if I can locate and acquire the rare PRC-47, it may not even be operational, and he wants a working rig. If he does accept the TS-50, I'll ship it to him with everything he could need. This will at least get him on the air. Dave, you can personally email me for further discussion on this @ [email protected].

Regards,
Mike

73 DE WX9HV

[lamare]

Hi Dave,

I am unable to locate a PRC-47 online anywhere for Eric or I'd attempt to spring for it, in hopes that it even works... I doubt Eric will accept it, but ask him if he will accept a Kenwood TS-50, it is a good mobile HF rig with 100 watts PEP, does USB, LSB, AM, & CW of course. If he is ok with that, what else will he need, tuner, dipole, vertical 40m hamstick? I hope he will accept the TS-50, since even if I can locate and acquire the rare PRC-47, it may not even be operational, and he wants a working rig. If he does accept the TS-50, I'll ship it to him with everything he could need. This will at least get him on the air. Dave, you can personally email me for further discussion on this @ [email protected].

Regards,
Mike

73 DE WX9HV

There appears to be a PRC-47 for sale here:
AN/PRC-47 Tactical VHF Transceiver In Stock
Search results for: 'prc-47'

This is a direct link to the unit:
AN/PRC-47 Tactical VHF Transceiver

They ask $300 for it...

[john_g]

True Wireless by Tesla

Hi

I thought this article by Tesla, printed in the Electrical Experimenter, gives more background supporting Eric's video of the old radio site.

http://www.coralcastlecode.com/sitebuildercontent/sitebuilderfiles/TESLATrue.pdf

Regards

John

[Skiv]

thats pretty high freq to put through the ground,

Yes, it is, BUT...

1. Eric wrote about modelling the Alexanderson Array (originally 19 kc.) in the 160-metre ham band (1900 kc.). Note that's not a flat-coil system; I include it to to show him working higher frequencies. (What I read and see on videos is that it was a great system for storing incredible amounts of circulating energy, but not so hot as a radiator, but I may be misinterpreting.)

2. Eric seems to be saying in the SBARC video that he's using a flat coil system for transmit and receive on 40-metres (7000 kc.).

3. In the longitudinal electricity video, he's using a small flat coil pair setup to transmit and receive a signal (the beach scene).

4. In the Marconi Wireless video, he shows what looks like the exact same flat coil (one of the pair) and explains that it is "a 2.3 megacycle coil" and uses it to receive signals at 10,000 kc.

Looks to me like he's using it at those frequencies, and making it work for communications. If he was using a similar system at 7000 kc in 1986, then that's double the frequency I'm aiming at -- being mindful of the low-frequency advantages. I want to duplicate the design and see how it works.

I'm essentially trying to confirm that I read that right. If I'm right, then building the system seems fairly straightforward (once I've got the math sorted, which may be non-trivial).

Did that throw a little more light on what and why I'm asking? If not, I'll keep trying -- I'm finding new information all the time, and it's helping my understanding.

[jake]

Crystal Radio Rite of Passage

Im moving all my crystal radio questions over to:

http://www.energeticforum.com/renewable-energy/10731-crysta-radio-magic.html#post182800

Please show me what you got.

Also I held out until I got the crystal ear piece. It works well. A little too well.

[dR-Green]

Notes on the Crystal Set

When measuring the velocity difference between underground and our ground, the two seperate receivers can be brought into phase unison by the use of a test oscillator. Both receivers must have a primary tank circuit, here you can place your measurement equipment.

The detected AM output, audio frequency, signal is immune to receiver phase shift. This is a property of A.M. detection. Use the audio to measure propagation delay.

Ok, the provisional results of the experiment are in

Transmitter Power = 100kW
Transmitter distance = 84780 Metres
Underground wave velocity approx = 300178714.7 Metres/sec
Average time difference between wave detection = 363.888888888888ns
Ratio to overground wave velocity = 1.001288414
Average audio signal delay = 13469ns

Scope data in Excel charts:

Channel A (Blue) = Underground
Channel B (Red) = Overground





I'll upload the gathered data soon.

[dR-Green]

Radio signal:



Audio signal:



Also despite the apparent better reception of the overground wave judging by the radio signal image, the underground receiver was much louder and clearer and had to be turned down to get it equal with the other. The noise/interference in the audio signal of the overground receiver can be seen and compared in the other image as an example. That was one of the best possible samples during the particular experiment.

[Kokomoj0]

out of curiosity did you put a well grounded faraday cage over the coil and grounds to insure no tem was getting through?

[t-rex]

guaranteedCosmic InductoriumHoly Grail of Electrical Engineering

[Kokomoj0]

Radio signal:



Audio signal:



Also despite the apparent better reception of the overground wave judging by the radio signal image, the underground receiver was much louder and clearer and had to be turned down to get it equal with the other. The noise/interference in the audio signal of the overground receiver can be seen and compared in the other image as an example. That was one of the best possible samples during the particular experiment.

I presume that what you did here is build a matched set of coils, one receiving through the air and the other through the ground?

If they are not then we would need to know the both in air differences?

[Kokomoj0]

Radio signal:



Audio signal:



Also despite the apparent better reception of the overground wave judging by the radio signal image, the underground receiver was much louder and clearer and had to be turned down to get it equal with the other. The noise/interference in the audio signal of the overground receiver can be seen and compared in the other image as an example. That was one of the best possible samples during the particular experiment.

I presume that what you did here is build a matched set of coils, one receiving through the air and the other through the ground?

If they are not then we would need to know the both in air differences?

Ideally two identical coils, one receiving in air and one in a faraday cage receiving telluric?

[Nhopa]

20 turn coil vs. 30 turn coil

....I would also like to ask if anyone noticed that there is 2 different designs, a 30 turn and 20 turn coil.

I think I have collected enough material to start building the receiver, however, I have a question. I have not seen any reply to Madhatter's question. Did anyone make a 30 turn coil yet? If yes, how does it compare to the 20 turn coil. The more turns the lesser the coil diameter for a given frequency, so this seems to be an advantage. Any comment? Thank you.

[madhatter]

I know Eric has mentioned the coaxial braid design complication of calculation. late last night I came across an army navy document with the old Fortran IV code for such a thing. This is coaxial cable braid design parameters by Jack Spergel. I'm working on making the equations and cards useful, hopefully I will have something that can take input from the current line of RG cable and spit out the info desired.

It may seem trivial but there is a specific calculation to the braid, the terms for varies parts are carriers, picks and ends. the carrier is the strand of N number of ends or wires, so for a 15/4 for example that's 15 carriers with 4 ends or 4 wires in each carrier for a total of 60 wires. now the picks are a bit more complicated as that's the weave pattern you see and it's the axial distance that the carriers cover as they braid past each other, that distance is based on the angle of the weave. SO that's the simple version, there's frankly a lot more on surface area, coverage and density.