What is CT-1?

CT-1 is a standard for cordless telephones operating in the 900 MHz frequency range. The CT-1 is an Analog system used in Europe which improves on the 49MHz CT-0 sets used in Asia, America and some European countries.

Do not get me wrong, I did not do it by myself. We had a very nice team of 4-5 engineers (at any time) and we even won a company award. It was much fun to develop this phone and its variants, all in all these were (at some point or another) the team members:

                   Luc Castermans, Harry Dijkstra,
               Didimo Grimaldo, John Soree, Karbiu Chan
                Koen Smits, Ernst Klomp, Jos Geboers

Getting all that functionality was artcraft! imagine only 16KB of ROM in the handset and 8KB in the base, and both of them with only 256 bytes (yes, not kilobytes, just BYTES) of RAM!!!

The product

Here is one of one of the products with a set rich in features such as:

• Multi-handset support (up to 7)
• Two-way paging and intercom
• Pseudo-dynamic analog scrambling over the radio link
• 21 bit security code
• Battery management
• 12 character LCD with icons
• Approved for the most stringent specifications of the German Bundespost.
• One firmware for multi-standard (several countries)
• Intelligent Last Number Redial
• Each handset fully customisable
• Preferred handset feature
• Automatic pause insertion (4 prefixes)
• Fully programmable by the user
• and more...

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