Kenwood TM-255A Instruction Manual page 64

Autopatch
A service available widely in the U.S.A. and Canada
that allows portable or mobile stations to access the
public telephone network by connecting through a
local repeater. Telephone numbers are sent via
DTMF signals by using the microphone DTMF
keypad. Only non-commercial communication is
authorized.
Automatic Level Control (ALC)
A circuit that automatically varies its gain to keep
microphone audio input to the transceiver at a
constant level.
Call channel
A frequency intended for establishing contact with
other stations. A microphone key is dedicated to the
Call channel so the frequency can be recalled quickly.
CTCSS (Continuous Tone Coded Squelch System)
Also referred to as Tone Squelch. A method of
receiver squelch control that uses a subaudible tone
superimposed by the transmitter on the transmitted
signal. Only signals received with a subaudible tone
that matches the tone selected at the receiver can
open the receiver squelch.
CTCSS frequency
The subaudible frequencies used by CTCSS.
Default settings
The values selected for VFO frequency, Call channel
frequency, Frequency Step, etc. by the transceiver
after it is reset. All transceivers are shipped from the
factory with default settings.
DTMF (Dual Tone Multi-Frequency) signal
A signal created by combining two discrete audio
frequencies. Generally used for sending digits for
repeater control or Autopatch applications.
DTSS (Dual Tone Squelch System)
A squelch control system that relies on a burst of data
from the transmitter to open the receiver squelch.
Only when the transmitted code matches the code
programmed in the receiver will the squelch open.
Frequency step
The size of frequency change produced by turning a
tuning control one position or pressing microphone
[UP] or [DWN] one time while in VFO mode.
Group code
When using Page, a group will commonly agree ona
single code that will be used for calls targeted for all
members. This code is the Group code. See "Station
code".
Hang Time
See Squelch Hang Time.
'yP
The collection of keys on the microphone used to
send DTMF tones.
Locked-out channel
Memory channel
Menu Setup
This is a newer term introduced with the creation of a
Menu system for configuring transceiver features.
Menu Set-up allows functions to be turned ON or
OFF, or values to be set, through software rather than
physical buttons or controls. Once you learn how to
access the Menu, the standardized method of
configuring features simplifies operation.
Microphone PF (Programmable Function) keys
Keys located on the microphone that can have
transceiver functions assigned to them. Key
assignments can be changed as necessary.
Non-standard offset
Packet
Page code memory
A memory channel dedicated to storing only Page
codes. See "Page".
PTT (Push-to-talk)
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