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Crystal Radio Hand Written Sweep Method  Rate Topic 
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 Posted: Dec 16th, 2014 04:25 AM
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Dr. Heinz Doofenshmirtz
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I would be trying this, if I had magnet wire.

Here is the Experiment.
Build Fox hole radio.
Create a "stylus" out of the pencil.
Formulate a list of predetermined questions.
Record the audio output of the "fox hole radio" (I think it would be best to work in a mute environment, turn your speakers down).
Use the "stylus" to draw each letter of your question, onto the blued steel razor (or a similar object (blued steel). Then a question mark.
Continue down the list for each question, giving pause for identification in between questions.
Review recording for relevant responses.

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fox.jpeg

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 Posted: Dec 16th, 2014 04:27 AM
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Dr. Heinz Doofenshmirtz
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"Stylus".

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th.jpg

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 Posted: Dec 16th, 2014 04:35 AM
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Dr. Heinz Doofenshmirtz
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The steel razor HAS to blued. AKA get it real hot.

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 Posted: Dec 16th, 2014 05:37 AM
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ArizonaEvp
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Hiya Doc,

In making a diode out of the razor blade - pencil method, you would have to find the right spot on the blade to get the best forward voltage drop so.....from that standpoint you would get a sweep-style sound as you write out your question(s).

If you wanted a larger work area so to speak, you could always use a floor scrapper blade.  You can get a 14 inch carbon steel blade at lowes for $5.18.

http://www.lowes.com/pd_464688-1255-2531BH_0__



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blade.jpg

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 Posted: Dec 16th, 2014 11:49 PM
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Jan
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I know 'foxhole' radios were made from whatever could be found, but I don't see the advantage of such an insensitive and unreliable detector over a usual germanium diode in this application?

Jan

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 Posted: Dec 18th, 2014 04:52 AM
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Dr. Heinz Doofenshmirtz
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Balderdash! The Insensitive and unreliable demodulation of RF is the point of THIS application.

The elemental composition of the graphite, the sharpness of the pencil "lead", angle, pressure, placement,  the microscopic deposits left on the razor, AND intent, all factor into a once in a lifetime, non-reproduce-able, random, manual sweep of the diode itself.

Analog linear or random voltage sweepers are sweeping varactor diodes, not the detector. The varactor diode changes capacitance when reverse voltage is applied. They generally take the place of the tuning capacitor.

A fixed coil and detector diode, with no modulation of the tuning capacitance would result in a DRV method.



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 Posted: Dec 18th, 2014 05:29 AM
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Dr. Heinz Doofenshmirtz
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AZ, Nice!
I don't know if I could explain to my wife, why I would be cooking a 14" piece of steel, with a blow torch...............

Great  idea on the scraper. I will look for something along the lines of a hand scraper to start out with.

I was just putting the idea out there. Looks like I'm going to have to build it myself.

I would  like to incorporate (if possible), the idea of modulating the detector diode's curve properties, into my next VT sweep box.

Outside of a photo-diode, I can't presently think of any other way (possibly) to do this, except for mechanical manipulation.

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 Posted: Dec 18th, 2014 06:10 AM
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Dr. Heinz Doofenshmirtz
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photo-diode wont work...... tunnel diode? Jan......They come in germanium!

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 Posted: Jun 16th, 2015 02:53 AM
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Phoenix
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germanium works better You also need to be able to record and play back. I use a similar method I use audacity to process the recordings. The messages are about 30% faster than normal speech as a rule.

Iknow there is no variable capacitor on that radio but it helps the messages. It works in a similar way as the planchette of the ouija board

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 Posted: Jun 16th, 2015 04:08 AM
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Dr. Heinz Doofenshmirtz
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The argument is not that the germanium diode is in anyway inferior, quite the opposite, especially for radio wave detection.

That being said.... The idea is to be able to modulate the voltage drop characteristics of the detector itself.

I assume you are moving a wiper across the tuning coil, when you say "in a similar way as the planchette"?

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 Posted: Jun 16th, 2015 10:15 AM
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Phoenix
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 :)  Okay but you will still need to record and play back the sounds. I found the speech to be too fast to hear clearly, even with Echovox. Reversals are also common and in my case the entities I talk with using the sweep radio methods and random sound generators they use reversals to finish sentences started in forward play. It may also be helpful to use the ultra sensitive earpiece.


 That being said it is 100% worth the work. I've learned a great deal through this kind of communication and the experience with the entities has been incredible.

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