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Valve problems
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MadScientist



Joined: Nov 28, 2011
Posts: 63
Location: Denmark

PostPosted: Tue Dec 06, 2011 5:28 pm    Post subject: Reply with quote  Mark this post and the followings unread

Interesting. I have never encountered parasitic rectification in naturally occurring semiconductors, which was sensitive to *anything* close to radar frequencies. As far as I am aware the early developments of radar was hampered by a lack of suitable diodes for the receivers, as none of the regular point contact diodes of the day, man made or natural, worked for the job. During the war the US actually had to develop the first, industrial scale use of refined Germanium for diodes for radar reception (the 1N23 family of point contact diodes, and earlier models).

The Germans had to jump through some silly hoops just to get their vacuum tube receivers to work at 4-500 MHz. They didn't use 'natural' semiconductors either for their diodes.

Are you talking about arching perhaps, and not direct rectification? This is what is usually encountered in large transmitter facilities due to poor connections in guy wires etc., a problem which may also generate the problems you describe.
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DES



Joined: Feb 28, 2003
Posts: 683
Location: New Jersey
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PostPosted: Fri Dec 09, 2011 5:22 pm    Post subject: Reply with quote  Mark this post and the followings unread

I'm sure that sparking could be the primary culprit in something like this. A spark-gap transmitter is very noisy in the Rf spectrum.
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