[Milsurplus] Doubting the Foxhole Radio, conclusions

[Mike Feher]

You got it almost right Kurt, however they were coherer receivers. There
were of course a lot of others tried, but, the Fleming valve came on the
scene pretty early as did deForest inserting a grid in it. - Regards - Mike 

Mike B. Feher, N4FS
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960 


-----Original Message-----
From: milsurplus-bounces at mailman.qth.net
[mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of KD7JYK DM09
Sent: Friday, August 03, 2012 7:21 PM
To: Milsurplus at mailman.qth.net; appo2 at juno.com
Subject: Re: [Milsurplus] Doubting the Foxhole Radio, conclusions

"Well,,original radio communications used spark gap transmitter,,,and so
called coherent detector receiver,,there were no vacuum tubes.coherent
detector must be shaked if it were dot or dash in cw.But it worked,changed
the course of wars."

They used coherers, called such because the materials inside tended to
cohere in the presence of electromagnetic and electrostatic fields, thus
closing the circuit.  It was also a vacuum tube.  Tell me about this shaking
process...

Kurt 

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