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Re: Max anode voltage?

Original poster: Ed Phillips <evp@xxxxxxxxxxx>

Original poster: olivaw@xxxxxxxxx
On Fri, 19 May 2006 10:29:31 -0600, you wrote:

>Probably have to go a bit farther back to find acorn tubes.  I think
>that acorns were used in aircraft transponders at 1GHz.

They were used in a primordial radio altimeter that worked at the
astoundingly high frequency of 450 MHz (erm... Mc/Sec).

And some sort of lighthouse tube was used at around 1Ghz for an
"Information Friend or Foe" transponder."

Somewhere around here I have the remains of a radiosonde I found on the desert which has a tube which looks like a 958A but no label (or much else left) when I found it. Also have one with a 3A4 and others with 5703's and the RCA cavity oscillators. Wonder if anyone has ever compiled a history of radiosonde development?

Wasn't the "acorn tube" altimeter the APN-1? The APX-6 IFF transponder I have uses a 2C44 (not the more common 2C43) lghthouse tube in the output stage but I'd have to look at it again to see what's used in the receiver.