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TB7100 Installation and Operation Manual Glossary 131

city squelch

When a radio’s noise mute threshold is programmed for city squelch, the

radio is less sensitive to interference than if programmed for country squelch

and so stronger signals are required for the radio’s speaker to unmute.

City squelch is also known as local squelch.

CODEC An IC which combines analog-to-digital conversion (coding) and digital-

to-analog conversion (decoding).

configuration file A configuration file consists of all the configuration settings needed for a

base station, stored as a file in the configurations folder. Configuration files

have the extension *.t7p. The TB7100 uses two files, one for the receiver

and one for the transmitter.

country squelch When a radio’s squelch threshold is programmed for country squelch, the

radio is more sensitive than if programmed for city squelch and so the radio’s

speaker unmutes more readily. When programmed for country squelch, the

radio can be used in areas where the signal may be weak and where

maximum range is desirable.

Country squelch is also known as distant squelch.

CTCSS CTCSS (continuous tone controlled squelch system), also known as PL

(private line), is a type of signalling that uses subaudible tones to segregate

groups of users.

CTCSS/DCS filter The CTCSS/DCS filter removes any CTCSS or DCS tones that may be

present on the received audio. The filter limits the range of frequencies the

radio passes from the incoming signal to the speaker and so in some

situations affects signal quality. Filtering can be automatically switched off

for channels that do not have CTCSS or DCS.

CTU A Calibration Test Unit (CTU) is a device used to assist in making testing

and calibration of the TB7100 easier.

CWID CWID (Continuous Wave IDentification) is a method of automatically

identifying the base station using a Morse code.

DAC Digital-to-Analog Converter. A device for converting a digital signal to an

analog signal that represents the same information.

data call A data call is a call or part of a call between two radio units that carries data

rather than speech communications. A data call can be a status message,

short data message or non-prescribed data (NPD) call.

DCS DCS (digital coded squelch), also known as DPL (digital private line), is a

type of subaudible signalling used for segregating groups of users. DCS

codes are identified by a three-digit octal number, which forms part of the

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