TELECOM Digest OnLine - Sorted: Re: Very Early Modems

Re: Very Early Modems

Scott Dorsey (kludge@panix.com)
24 May 2005 11:49:49 -0400

Tony P. <kd1s@nospamplease.cox.reallynospam.net> wrote:

>> http://www.att.com/history/milestone_1958.html

> So the carrier was on tape. How interesting.

> I guess at that point it was hard to stabilize a tube based
> oscillator.

It is much easier to stabilize a tube oscillator than it is to
stabilize a mechanical device like a tape machine. The old HP 200CD
bench oscillator from the fifties is nearly as stable as the modern
bench gadgets once it warms up.

The tape in this device is almost certainly being used to store a
varying carrier, for encryption purposes.

--scott

"C'est un Nagra. C'est suisse, et tres, tres precis."

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