CB radio ch 9
Public service agencies don't use CB radio for official communication.
channel 9
Supposedly, they monitor Channel 9, but it's really rare to find police officers/police agencies which actually do. If a police officer is monitoring the CB radio, they're more likely to be monitoring Channel 19 than Channel 9.
Sure, you can use it; but it might not do a very good job. If you're listening to AM, you're receiving between 0.5-1.6 MHz, whereas FM is coming to you at 88-108 MHz. The CB antenna is designed to be resonant at 27 MHz.
channel button: tunes to the channel frequency of which you want squelch: detrmines the distance in which your radio is broadcasting Volume: loudness mic input: where you put you microphone
A CB radio is a Citizens Band Radio. It has 40 channels and is used for short distance communication. CB radios are mostly used in semi trucks so that they can communicate with other truckers, weigh stations, home base, and to find out the weather. A CB has different channels for different things while you are on the road. Channel 9 is for emergencies, channel 19 is a highway travelers monitor channel, you can get information about road construction, police blocks, and weather. Some of the features that a CB radio has are: Automatic noise limiters, a built in pa system or "bullhorn", Volume controls, and many microphone features.
A mobile CB radio.
Used, about $40 - 50 is all you'll get out of it.
That depends on what type of handheld radio you're using. They do make handheld CB radios. They have both 40 channel handhelds, and single channel handhelds (some of which may actually be three channel with the purchase of additional radio crystals). The single channel handhelds typically use Channel 14 as a default. FM radios, such as those used in FMRS, GMRS, Business Radio, emergency services, etc. do not use the same frequencies as CB radios, and cannot communicate with them.
CB radios and scanners are available from BestBuy. For instance, Midland CB radios cost a price of $78.98. In contrast, the Midland 40-channel CB radio costs $54.98.
I do not see how a CB radio could interfere with VoIP service. If the CB radio is creating interference on the line, check your telephone. Or even check your broadband modem to ensure that you are not creating packet loss due to the CB radio.