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26-04-2008, 02:17 PM
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Mot Adv-NSW
Join Date: Jun 2005
Location: Lake Macquarie, NSW
Posts: 2,153
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Knowing that some here use UHF CB on the road, those of you technical might find this of interest.
400Mhz, future of UHF CB et al Discussion:- http://www.austech.info/communicatio...html#post40513 See Page 36 of the Pdf download re 12.5Khz channel spacing, see link within. http://www.acma.gov.au/WEB/STANDARD/pc=PC_311117 The closing date for submissions is 18 July 2008. J.
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ORDER FORD AUSTRALIA PART NO: AM6U7J19G329AA. This is a European-UN/AS3790B Spec safety-warning triangle used to give advanced warning to approaching traffic of a vehicle breakdown, or crash scene (to prevent secondary). Stow in the boot area. See your Ford dealer for this $35.95 safety item & when you buy a new Ford, please insist on it! See Page 83, part 4.4.1 http://www.transport.wa.gov.au/media...eSafePart4.pdf |
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26-04-2008, 07:20 PM
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FF.Com.Au Hardcore
Join Date: Dec 2004
Posts: 12,077
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In answer to your questions over there:
1) 12.5Khz is not a problem provided there is an offset, maybe 5 or the defacto standard 9Mhz for TTR activity. The current 750Khz offset makes it difficult and expensive to maintain isolation. 2) Analog FM should not be replaced by digital as it will reduce range, make incumbent equipment and systems redundant and inflate CPE prices. 3) 25w over 5w is only 7db but increases the RF current to a level where users who misoperate their equipment could cause injury or death. The increase in range is insignificant. Also on existing TTR it would require another 7db of isolation which would result in at least 1.5-2db insertion loss. But of course it is the government so it will be a clusterflug........ |
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Future of 400Mhz - UHF CB - planning underway.
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