In the UK, the requirements are fairly clearly defined as part of the licence conditions for the repeater:
access:The repeater must not be carrier accessed directly from "cold" and adequate immunity must be provided against access by speech or noise. Initial access shall, as a minimum, be by a carrier modulated with a CTCSS tone of the frequency stated on the Notice of Variation. The CTCSS detector for this purpose, should respond to only that tone, when it is present for less than 1 second at a deviation of 10% or less of the appropriate maximum i.e. +/-500Hz for 25kHz units and +/-250Hz for 12.5kHz units. In addition, but optionally, access may be by a tone "burst" of 1750Hz plus or minus 25Hz at a deviation of 50% or less. The acceptance time of the tone between 200 and 400ms. The repeater once accessed, must radiate the same CTCSS tone at nominal level of 10% of maximum. I.e. +/-500Hz for 25kHz units and +/-250Hz for 12.5kHz unit. 73 Ian G4FSU ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
