110 Baud modem

Paul Koning paulkoning at comcast.net
Tue May 9 19:55:36 CDT 2017

> On May 9, 2017, at 4:41 PM, Pete Lancashire <pete at petelancashire.com> wrote:
> The relays were from WECO. Made by the millions, they were the ones  used in all Bell telephone exchanged from the early 50's up to the ESS (electronic) exchanges. Remember seeing ones with less then a full compliment of contacts, but that was pretty uncommon.
> https://archive.org/details/bstj31-6-1023

Nice, thanks.  I recognize the older "U" style relays, my father used a bunch of those in various ham radio projects.

The end of that article describes Wire Wrap technology.  I wonder if that was the first time it appeared.


More information about the cctech mailing list