Kitz Forum
Chat => Tech Chat => Topic started by: burakkucat on June 06, 2021, 08:58:41 PM
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Recently, I had an opportunity to read the printed hand-outs of "Introduction to Line Transmission", Course No E11200, provided by the British Telecom Technical College and dated July 1985.
Being an introduction to the subject, it started at a very elementary level and so I found the course modules as an easy read. That said, there were times when I found myself saying "Ah, so that is why . . ." or "Oh, I never realised . . ."
Here follows a list of the course modules --
- Signals
- System Compatibility
- Diagram Symbols
- dB Notation
- dB Meters
- The Measuring Set 44C
- Transmission Lines
- The Card A140
- The Public Switched Telephone Network
- The Termination Unit
- Audio Equalizers
- Audio Amplifiers
- 4-Wire Amplified Circuits
- Private Circuits
- Setting-Up and Lining-Up a 4-Wire Amplified Circuit
- Faulting a 4-Wire Amplified Audio Circuit
- Transmission Equipment Practice
- Power and Alarms
- Filters and Modulators
- Frequency Division Multiplex
- Digital Transmission
- Non-Speech Services
One thing that interested me was that for the practical work, using the Measuring Set 44C, a simulated 4-wire audio circuit (complete with amplifiers and attenuators) was provided, packaged as a "Suitcase"! The "Suitcase" was fitted with a number of switches which, when operated, provided a diverse range of faults so that practical experience of fault-finding on a 4-wire audio circuit could be gained.
I wonder if anyone has one of those "Suitcases" tucked away in their garage or roof-space? If yes, sight of a clear photograph thereof would be appreciated, please. ;)
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You've just brought lots of nice memories flooding back as I remember using those as an apprentice. Made by Wayne Kerr, which is perhaps not the best thought out company name of all time.
There's one for sale on eBay right now - https://www.ebay.co.uk/itm/294173824616 - and hopefully the attached photo from said listing shows what you need.
:)
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There's one for sale on eBay right now - https://www.ebay.co.uk/itm/294173824616 . . .
Ah, yes. That one, with extensive rust on the outer casing, yours for £90 less one penny!
There were front panel diagrams of each one of the four separately manufactured "Measuring Set 44C" contained in the course hand-outs. Wayne Kerr, Boyd Design Services, Autec Electronic Ltd. and Hatfield Instruments were the four manufacturers. Of the four, just the first and last are the ones of which I am familiar.