Why do we have two approved radio frequencies (418 & 433 MHz) in the UK?
Originally the DTI (Department of Trade and Industry, responsible for regulating the use of the radio spectrum in the UK) only permitted the use of the 418 MHz band for low-powered radio devices whereas the rest of EU have standardised on 433 MHz. The DTI has finally permitted the use of the 433 MHz band in order to harmonise with the rest of the EU. Due to the small market size, X-10 would probably phase out the use of 418 MHz gradually with wireless modules only available on 433 MHz. Q13. What is the unit code of the TM12E/TM12U built-in appliance module? The unit code of the TM12E/TM12U built-in appliance module is fixed to 1 and cannot be changed. Q14. What is the unit code of the RR501 built-in appliance module? The unit code of the RR501 built-in appliance module can either be 1 or 9, depending on the slide switch position. Q15. I’ve seen references saying that the X-10 system is a security system. Does that mean it is a burglar alarm system? The general X-10 system is not a burg
