Uniden BCD260DN English Owners Manual - Page 14

Understanding Banks

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Conventional Scanning Conventional scanning is a relatively simple concept. Each group of users in a conventional system is assigned a single frequency (for simplex systems) or two frequencies (for repeater systems). Any time one of them transmits, their transmission always goes out on the same frequency. Up until the late 1980's, this was the primary way that radio systems operated. Even today, there are many 2-way radio users who operate using a conventional system: • Aircraft • Amateur radio • FRS/GMRS users • Many business radio users When you want to store a conventional system, all you need to know are the frequencies they operate on. When you are scanning a conventional system, the scanner stops very briefly on each channel to see if there is activity. If there isn't, the scanner quickly moves to the next channel. If there is, then the scanner pauses on the transmission until it is over. Simplex Operation Simplex systems use a single frequency for both transmit and receive. Most radios using this type of operation are limited to line-of-sight operation. This type of radio is frequently used at construction job sites, and with inexpensive consumer radios such as GMRS/FRS radios. The range is typically 1-8 miles, depending upon the terrain and many other factors. Repeater Operation Repeater systems use two frequencies: one transmits from the radio to a central repeater; the other transmits from the repeater to other radios in the system. With a repeater-based system, the repeater is located on top of a tall building or on a radio tower that provides great visibility to the area of operation. When a user transmits (on an input frequency), the signal is picked up by the repeater and retransmitted (on an output frequency). The user's radio always listens for activity on the output frequency and transmit on the input frequency. Since the repeater is located very high, there is a very large line of sight. Typical repeater systems provide coverage out to about a 25-mile radius from the repeater location. UNDERSTANDING BANKS Channel Storage Banks To make it easier to identify and select the channels you want to listen to, the 1,000 channels are divided into 10 channel storage banks containing 100 channels each. You could use each channel storage bank to group 14

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14
Conventional Scanning
Conventional scanning is a relatively simple concept. Each group of users in
a conventional system is assigned a single frequency (for simplex systems) or
two frequencies (for repeater systems). Any time one of them transmits, their
transmission always goes out on the same frequency. Up until the late 1980’s,
this was the primary way that radio systems operated. Even today, there are
many 2-way radio users who operate using a conventional system:
•
Aircraft
•
Amateur radio
•
FRS/GMRS users
•
Many business radio users
When you want to store a conventional system, all you need to know are the
frequencies they operate on. When you are scanning a conventional system,
the scanner stops very briefly on each channel to see if there is activity. If
there isn’t, the scanner quickly moves to the next channel. If there is, then the
scanner pauses on the transmission until it is over.
Simplex Operation
Simplex systems use a single frequency for both transmit and receive. Most
radios using this type of operation are limited to line-of-sight operation. This
type of radio is frequently used at construction job sites, and with inexpensive
consumer radios such as GMRS/FRS radios. The range is typically 1-8 miles,
depending upon the terrain and many other factors.
Repeater Operation
Repeater systems use two frequencies: one transmits from the radio to a
central repeater; the other transmits from the repeater to other radios in the
system. With a repeater-based system, the repeater is located on top of a
tall building or on a radio tower that provides great visibility to the area of
operation.
When a user transmits (on an input frequency), the signal is picked up by the
repeater and retransmitted (on an output frequency). The user’s radio always
listens for activity on the output frequency and transmit on the input frequency.
Since the repeater is located very high, there is a very large line of sight.
Typical repeater systems provide coverage out to about a 25-mile radius from
the repeater location.
UNDERSTANDING BANKS
Channel Storage Banks
To make it easier to identify and select the channels you want to listen to,
the 1,000 channels are divided into 10 channel storage banks containing
100 channels each. You could use each channel storage bank to group