Service manual

Image:

A "false" signal generated by the scanner during reception and demodulation.

Intermediate Frequency

(IF):

A frequency used in the demodulation process (see

Dual-conversion and Triple-conversion).

kHz (kilohertz):

A unit of frequency equal to 1000

Hz.

Lock-out: To mark a channel to not be scanned.

MHz (megahertz):

A unit of frequency equal to 1000

kHz or 1,000,000 Hz.

Priority Channel:

A channel which is scanned regularly during normal scanning.

Reset: Return the scanner to factory settings.

Reinitialize: Return the scanner to factory settings.

RX:

Shorthand for Receive or Receiving.

Scanner: A radio that can tune quickly and/or automatically to a wide range of frequencies used by hobbyists to monitor

police, fire, and other emergency services.

Service Band: A particular frequency range used for a particular purpose.

SMR: Acronym for "Service Maintenance Repeater", indicating that radio operators must be a member of that club to

transmit to that repeater.

Squelch: Allows you to set the minimum strength signal that will be received.

Super-heterodyne:

Describes a transmitting encoding method which mixes a carrier and oscillator frequency.

Triple-conversion: A method using a receive circuit with three stages and three intermediate frequencies to extract the data signal from

the carrier.

Trunk tracking: Following conversations that are broadcast on radios automatically tuned by a computer.

TX:

Shorthand for Transmit or Transmitting.

UHF:

The frequencies between 300 MHz and 3 GHz.

VHF:

The frequencies between 30 MHz and 300 MHz.

Back to Main Index