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Channel 40 is the primary road safety channel Australia-wide, most commonly used by trucks including pilot/escort vehicles for oversized loads. [6] [7] Users should be aware that UHF CB channels 31 to 38 and 71 to 78 are the 'input' channels for repeaters. Users should avoid using these channels to avoid interfering with repeaters.
These roughly corresponded to the present channels 5–22, except for the two unique frequencies that are known as 11A (Channel 7 on an 18 channel Australian CB) and 19A (Channel 16 on an 18 channel Australian CB) or remote control frequencies but are no longer part of the Australian 27 MHz CB band since 40 Channels were introduced. [21]
The CB Radio Service spectrum is divided into 40 numbered radio frequency channels from 26.965 to 27.405 MHz. Channel spacing is 10 kHz between channel centers with exceptions where CBRS channels are adjacent to Radio Control Radio Service. The initial channel allocations had a gap equal to two channel spaces between channels 22 and 23.
Eventually, all of the old CB radios were sold for under $40. [2] [3] With fewer than 100 stores, far fewer than the aggressively expanding Radio Shack's thousands of local outlets, Lafayette Radio remained more of a dedicated enthusiasts' store than a mass marketer.
CB Radio: 40.66 MHz: 40.7 MHz 40.68 MHz 40 kHz B Worldwide: Fixed, mobile services & Earth exploration-satellite service: 433.05 MHz: 434.79 MHz 433.92 MHz 1.74 MHz A only in Region 1, subject to local acceptance Amateur service & radiolocation service: With provisions of footnote 5.280 902 MHz: 928 MHz 915 MHz 26 MHz B Region 2 only (with some ...
In August 2005, India deregulated the 26.957–27.283 MHz band for license-free CB radio usage with a maximum power output of 5 watts. The channel plan follows channels 1–27 from the standard 40 channel CB plan originally adopted by the United States (and most other countries worldwide). Channel 1 is 26.965 and channel 27 is 27.275 MHz.
CB users sometimes migrate to "out of band" channels/frequencies, most famously 27.555 MHz, referred to as "Triple Nickel." 27.555 MHz is well above the 40 channel CB standard allowing for a more private conversation and enhanced radio communications. Modified equipment is usually required to access this frequency. Turn and burn
Physical length of conventional cavity filters can vary from over 205 cm in the 40 MHz range, down to under 27.5 cm in the 900 MHz range. In the microwave range (1000 MHz and up), cavity filters become more practical in terms of size and a significantly higher quality factor than lumped element resonators and filters.