Selective Squelch Code Select; Penalty Timer; Conversation Timer - E.F. Johnson Company 4100 SERIES Operating Manual

Digital/analog portable radio
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are taken and then the bits are rotated to determine if a
valid code was received.

5.5.5 SELECTIVE SQUELCH CODE SELECT

(CTCSS/DCS/NAC)
NOTE: Call Guard codes can be permanently repro-
grammed by keypad programming described in
Section 5.18.
This feature allows the normal transmit and
receive Call Guard (CTCSS/DCS/NAC) program-
ming to be temporarily overridden with a code
selected from a preprogrammed list. It is available if
the Squelch Select List option switch or menu param-
eter and a CTCSS/NAC code list have been
programmed.
In addition, conventional systems can be
programmed for the Keypad CTCSS/DSC feature.
Codes can then be selected directly from the table by
pressing the key for the code. For example, to select
code 3 from the table, simply press the "3" key. No
other conventional mode functions can then be
assigned to these keys.
The CTCSS/DCS/NAC list is programmed with
up to 64 tone (CTCSS) or digital (DCS) Call Guard
codes. Different codes can be programmed for the
transmit and receive modes, and carrier squelch (selec-
tive squelch disabled) can be programmed if desired.
In addition, each position can be programmed with an
NAC code for use with P25 operation.
When the Call Guard code is changed using this
feature, it remains selected even if other channels are
selected. However, if radio power is cycled or a talk-
around channel is selected, the normal codes are rese-
lected. When scanning, the selected code also applies
to all scanned channels. Each channel can also be
programmed to always ignore the code selected from
this list and use the default code instead.
If both analog and digital (Project 25) channels
can be selected or scanned, the CTCSS/DCS code for
the selected position is used for analog channels and
the NAC code for the selected position is used for P25
channels. If a channel is programmed for mixed mode
operation, the selective squelch type (analog or digital)
CONVENTIONAL MODE FEATURES
programmed for the transmit mode determines the
selective squelch type used.
Proceed as follows to select a code using the
Squelch Select List option button or menu parameter:
1. Press the Squelch Select List option switch or select
the Sqlch Code menu mode parameter. Then press
the Up/Down switch to select the desired code. The
display indicates "SEL SQ xx" where, "xx" is the
selected code from 1-64. The code number and
actual code are alternately displayed (NACs are
displayed in hexadecimal).
2. To select the displayed code and return to the normal
display, press the F2 (Select) key or the Squelch
Select List switch again.
3. To check which code is selected, press the Squelch
Select List switch once to display the current selec-
tion and then again to return to normal operation.
4. To return to the normal selective squelch codes,
select "DEFAULT" in this mode. As previously
described, the normal codes are also automatically
reselected whenever radio power is cycled or a talk-
around channel is selected.

5.6 PENALTY TIMER

A penalty timer may be programmed on conven-
tional systems to prevent transmissions for the
programmed time after the time-out timer disables the
transmitter (see Section 4.3). The penalty timer can be
programmed for the same times as the time-out timer,
and timing starts when the PTT switch is released. If
the PTT switch is pressed during the penalty time, the
time-out indication occurs again and the transmitter
remains disabled. When the penalty timer expires, a
beep sounds and the transmitter can be keyed.

5.7 CONVERSATION TIMER

A conversation timer can be programmed on
conventional systems in addition to the time-out timer
(see Section 4.3). This timer limits the total length of a
conversation rather than just the length of each trans-
mission as with the time-out timer. The following is
more information on this timer.
29

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