Homepage - RF Cafe
Webmaster: Kirt Blattenberger | KB3UON | Sitemap | ©1996-2014     Visit RF Cafe on
      Menu below is just a small sample of what is here!          Visit RF Cafe on Facebook Visit RF Cafe on Twitter Visit RF Cafe on LinkedIn
Custom Search
More than 10,000 searchable pages indexed.
•−•  ••−•    −•−•  •−  ••−•  •
RF Cafe Morse Code >Hear It<

Tully Machine Restoration - The National Museum of Computing
Videos for Engineers

The National Museum of Computing - RF Cafe Video for EngineersIn the news recently was restoration to operational condition a Tunny code-breaking machine from the World War II era. It is part of the collection of calculating machines on display at the UK's National Museum of Computing, located in the renowned Blechley Park complex. Tunnys were used to decipher messages generated on the Lorenz SZ42 enciphering machines and sent from Hitler to his generals. Work was at a fever pitch in the days running up to the D-Day invasion. Keep in mind that the computers did not crack the code, they were for rapid deciphering of the volumes of messages sent daily. Restoration work on Tunny was performed by a team led by computer conservationists John Pether and John Whetter. "As far as I know there were no original circuit diagrams left. All we had was a few circuit elements drawn up from memory by engineers who worked on the original," per Mr. Pether. One of the original electrical designers, Sid Broadhurst, reportedly left an envelope filled with his engineering sketches sitting in the building's bathroom during the time when many of the machines were being dismantled. British Telecom (BT) engineers helps by providing expertise and a source of spare parts. I could not find a reference as to how many valves (tubes, to us Yanks), relays, switches, and feet of wire were used, but according to one source, a requirement for the project was that parts count be kept to a minimum in order to assure that it would be operational before the war was over - in favor of the Germans! Here is a really good write-up on the Colossus project that talks about Tully machines that includes detail on how the codes were cracked.




Tunny Deciphering Computer




The National Museum of Computing


Posted 9/13/2011
A Disruptive Web Presence

Custom Search
Over 10,000 pages indexed! (none duped or pirated)

Read About RF Cafe
Webmaster: Kirt Blattenberger
    KB3UON

RF Cafe Software

RF Cascade Workbook
RF Cascade Workbook is a very extensive system cascaded component Excel workbook that includes the standard Gain, NF, IP2, IP3, Psat calculations, input & output VSWR, noise BW, min/max tolerance, DC power cauculations, graphing of all RF parameters, and has a graphical block diagram tool. An extensive User's Guide is also included. - Only $35.
RF system analysis including
frequency conversion & filters

RF & EE Symbols Word
RF Stencils for Visio

Product & Service Directory
Personally Selected Manufacturers
RF Cafe T-Shirts & Mugs

RF Cafe Software

Calculator Workbook
RF Workbench
Smith Chart™ for Visio
Smith Chart™ for Excel
Your RF Cafe Progenitor & Webmaster
Click here to read about RF CafeKirt Blattenberger... single-handedly redefining what an
                                 engineering website should be.

View the YouTube RF Cafe Intro Video Carpe Diem! (Seize the Day!)

5CCG (5th MOB): My USAF radar shop

Airplanes and Rockets: My personal hobby website

Equine Kingdom: My daughter Sally's horse riding website