[Milsurplus] Doubting the Foxhole Radio, conclusions

[Mike Feher]

Kurt -

I do not want to change the subject here, but, I was referring to what you
said. You called it a coherent receiver. Also, Fleming valves were available
by 1905. Deforest put the grid in a few years later. Coherers were short
lived, along with magnetic detectors, and besides tubes, crystals were used
as the dominant detectors, especially in less expensive receivers. The time
line is in years, not many decades. The foxhole razor blade detector worked
on the same principal as a crystal.  - Mike  

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


-----Original Message-----
From: KD7JYK DM09 [mailto:kd7jyk at earthlink.net] 
Sent: Friday, August 03, 2012 8:21 PM
To: Mike Feher; Milsurplus at mailman.qth.net; appo2 at juno.com
Subject: Re: [Milsurplus] Doubting the Foxhole Radio, conclusions

: 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.

I think you are refering to the other guys comments.  I'm talking about
coherers used a few decades before valves were even imagined.

Kurt