Thanks Ted, I didn't know that!!

Paul Turney
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-----Original Message-----
From: Ted Kendall [mailto:[log in to unmask]]
Sent: Wednesday, November 4, 2009 12:30 PM
To: [log in to unmask]
Subject: Re: [ARSCLIST] power line frequency

At the risk of telling everybody something they already know, the Tonschreiber had a wide range of capstan speed to facilitate its purpose in life, which was to protect U-boats from the Allies' Huff-Duff detection apparatus. This, using two orthogonal antennae and a Lissajous display, could generate a practically instant fix from a U-boat transmission. The solution adopted was to record Morse at slow speed, replay at high speed to keep the transmission as short as possible and restore pitch with the rotating head-drum.----- Original Message ----- From: "Shai Drori" To: Sent: Wednesday, November 04, 2009 7:08 AMSubject: Re: [ARSCLIST] power line frequency> The solution is very simple. The capstan of the Tonschreiber did not run > off the incoming AC but had an oscillator and amplifier as a servo. It > could run at any speed from I think 9 to 130 cm/sec.>> Richard L. Hess wrote:>> At 07:09 PM 2009-11-03, you wrote:>>> From: Patent Tactics, George Brock-Nannestad>>> ....SNIP.....>>> The story continues. I would not be surprised to learn that northern >>> Italian>>> records were cut with machines run off 14 Hz or 16 2/3 Hz, which were in >>> use>>> for traction purposes. Let us see if a type-wri-toon will work here: >>> ;-) ->>> yes, it did.>>>> Hi, George,>>>> One thing that intrigued me is that the Tonschreiber version of the >> Magnetophon which was analyzed in depth after WWII by some Army Engineers >> who appeared to do a good job apparently could work from 25-60 Hz.>>>> Cheers,>>>> Richard>>>>>>>> Richard L. Hess email: [log in to unmask]>> Aurora, Ontario, Canada (905) 713 6733 1-877-TAPE-FIX>> Detailed contact information: http://www.richardhess.com/tape/contact.htm>> Quality tape transfers -- even from hard-to-play tapes.>