[RTTY] Mainline TTL Tube FSK Demod

[Jim W7RY]

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 at 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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