Bedienungsanleitung Uniden UBC895XLT (Seite 5 von 63) (Englisch)

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Terminology

What is Scanning?

Unlike standard AM or FM radio stations, most two-way communications do not transmit

continuously. The

BC895XLT

scans programmed channels until it finds an active frequency.

Scanning stops on an active frequency and remains on that channel as long as the transmission

continues. When the transmission ends, the scanning cycle resumes until another transmission is

received.

What is Searching?

The

BC895XLT

can search each of its 14 bands to find active frequencies. This is different from

scanning because you are searching for frequencies that have not been programmed into your

scanner. When you select a frequency band to search, the scanner searches for any active

frequency within the lower and upper limits specified. When an active frequency is found, the

scanner stops on that frequency as long as the transmission lasts. If the frequency is interesting,

you can program it into one of the banks. If not, you can continue your search.

What is CTCSS?

Continuous Tone Coded Squelch System (CTCSS) is a subaudible tone signaling system

sometimes referred to as

(Motorola’s trademark term standing for

Private Line

). CTCSS is

usable only for FM signals and is usually associated with both amateur and commercial two-way

repeaters. This system makes use of a special subaudible tone which accompanies a transmitted

signal. A set of 38 standard tones has been established by the the Electronics Industry Association.

CTCSS is used for many purposes. In many cases, CTCSS is used to restrict access to a

commercial repeater, so that only those units which transmit the correct tone along with their signal

can “talk to the repeater.” You may also need to have your scanner coded correctly to “hear” the

repeater.

CTCSS is also used in areas of high interference where there are several stations with output

frequencies in close proximity with one another. When this occurs, you may hear multiple

communications at the same time. The stations could even interfere with each other to the point

where it is impossible to clearly receive either one. When your receiver, in this case a scanner, is

equipped for CTCSS, you can code each received frequency with a specific CTCSS frequency.

Then, when multiple signals are broadcast, you will only hear the transmission with the CTCSS tone

you have programmed. If you do not receive the correct tone with a signal, the squelch of your

scanner remains closed and you will not hear anything.

Establishment of the CTCSS tone for each transmitter (or repeater) is usually done through the

cooperative setting of standards by local frequency allocation groups.

1 3 4 5 9 102 6 7 8

CHANNELS

Frequency not

entered

Frequency

Locked Out

(L/O)

SCAN

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