CA Chapman Associates
Welcome to the Web pages of Chapman Associates - a design consultancy based in the South East London area that is able to offer professional consultancy and user-friendly practical expertise in the fields of secure radio communications, electronic protection systems and counter-surveillance.
Company information, including our contact details.
MINDA The MINiature Duress Alarm was designed as an aid to the personal protection of people who may be at risk in business, social or other situations, such as VIP's, senior company executives and security personnel. Built around licence exempt radio transmitter and receiver modules, the key strengths of the MINDA system are compact designs, tremendous ease of use, and extreme versatility.

Building on the success of the original MINDA, Chapman Associates have now created a whole family of compatible products, including higher power transmitters, remote control switching systems, and a repeater unit for extending the operational range of the miniature low power transmitters.

This site contains a page of background about MINDA, as well as more technical information, starting with a detailed feature list.

MINDA tx & rx  
MaxiMINDA receiver  
Command Complementing MINDA, Chapman Associates have designed a range of UHF radio switching and alarm equipment:

Command transmitters Telemetry system MICRON switch
The 458-RC radio system is available in two formats: a Radio Command system for remotely switching other electronic devices on or off, and a Radio Alarm system which is similar to MINDA but capable of signalling over much greater distances. The UDF400 radio telemetry system enables remote control of TV cameras and other electronic systems. MICRON is a radio-controlled switching system, fully CAA approved for security use on aircraft, in which the miniature radio switch can automatically acknowledge any valid commands received from its hand-held command unit.

Audio An Audio Delay Line capable of continuously delaying speech signals fed into it by a period of 44 seconds.
  Last updated 17th March 2003. Pages designed by Philip Chapman.