WOW! That is a really cool TU!
Good luck on your quest.
73
Jim W7RY
-----Original Message-----
From: N4BE_Jim
Sent: Tuesday, June 18, 2013 11:08 PM
To: rtty@contesting.com
Subject: [RTTY] Mainline TTL Tube FSK Demod
I acquired a homebrew tube FSK demodulator from an eBay estate sale.
Probably a silent key. The seller was in Crawford, Ga.
The photos are at
http://s685.photobucket.com/user/N4BE/library/Mainline%20TT-L%20FSK%20Demodulator
The demod works perfectly as far as I can tell. The photos don’t do it
justice, it was planned and constructed in professional manner by whoever
did it.
This is actually a demodulator based on the design in Oct. 1965 QST
Magazine. There is a brief description at
http://www.rtty.com/development/tu/ttl-fsk/ttl-fsk.htm
My question is does anyone know who the ham might have been who built this?
I asked the estate seller but got no response. I actually built one of
these in 1967 when I was a kid, but mine was no where as well built and
compact as this. Brings back a lot of memories.
Jim N4BE
n4be_jim at yahoo.com
Sent from my iPad
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