25 watt - for radios the wattage is a measure of the carrier wave power at the set and you lose power from that point on thru the coax and antenna then obviously the atmosphere.Originally Posted by Cuppa
Propogation is determined by inverse square IE to double the range of a signal you need four times the transmitter power
There is no effect on the nearby users, same as driving past a radio station doesn't change the volume or blow up your FM radio BUT what does happen is now that you are Txing lets assume twice as far you blot out other distant users who could have been using the same freq otherwise because prev they were out of range.
That can be a real PIA on repeater freq's
Transmit off channel - In Oz we now have 80 channels in what was once the same spread or frequency band as 40 channels.
Each assigned channel has a carrier frequency on which the "voice" is carried and has to have a "gap" from the next to prevent cross talk or co channel interference or other techo guff (the adjacent channel interfering). This gap previously required in old gear and 40 channel days has been effectively halved due to the quality and technology improvements today but elcheapo sets may not be good enough to meet spec.
Someone on, say 20, with an elcheapo Chinee set can potentially blot out users up to twice as far away and also on the channels either side of 20.
The sets come "blank" IE you name each channel and program the bandwidth, carrier etc etc so same issue arises if you program a typo or whatever into the set
Full disclosure - I have non-compliant sets (Wouxun brand) capable of tx'ing on higher power than allowed on Oz CB freqs and you take the chance of having them seized at time of import by customs when purchasing. I used to use them on licenced freqs that legally allow higher power but to the letter of the law the sets are illegal in Oz due to the manuf not locking out our CB bands from the sets programming chip
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