Damn should not post late at night like now, after checking documents and putting wrong thing. You are right about 35MHz and not as I WRONGLY put
70MHz. Don't know what I was thinking there, so I am double checking my points and have multiple documents open at the same time to be sure this time!IR2030 is the more detailed document by band usage titled
UK Radio Interface Requirement 2030 Short Range Devices
My copy is dated as a PDF from 5th January 2001, originally from
Ofcom website details about all Short range device bands (helps for sorting out what might also be using part of same band or close by) is referenced in RA114:-
Helpfully this is supposed to be on the
However there is a Low Power RA Archive section that contains:-
It is only about 80KB so i can email it if you want.
The relevant table (in my copy) is Table 2.20 on page 26, part of which is below:- Categories Frequencies or Radiated Channel Music or Frequency Band level Bandwidth speech permitted i 26.96 - 27.28 MHz 100 mW 10 kHz No ii 34.995 - 35.255 MHz 100 mW 10 kHz No iii 40.66 - 41.00 MHz 100 mW 10 kHz No iv 433.05 - 434.79 MHz 10 mW 25 kHz No v 458.5 - 459.5 MHz 100 mW 25 kHz No
Any duty cycle is permitted
Reference Standard EN 300 220-1
You will find the main users of 27MHz are in cheap toys usually made in China for a world markets. Also nobody uses 27MHz unless they really have to, because of the many other adjacent and conflicting devices, even CB radio. These cheap toys have BINARY control controls.
459MHz is also allowed for any model, and gives a wider channel bandwidth allowing better bit rates 4800bps becomes possible. 433Mhz is only very low power for telemetry back and reduces range for anyone wanting to do communications feedback to control system.-- Paul Carpenter | snipped-for-privacy@pcserv.demon.co.uk Main Site GNU H8 & mailing list info. For those web sites you hate.