Conventional Mode Features; Monitoring Before Transmitting; Automatic Channel Monitoring; Manual Channel Monitoring - E.F. Johnson Company 5100 Series Operating Manual

CONVENTIONAL MODE FEATURES

Introduction
An overview of conventional operation is located
on page 10. The following information describes the
features unique to conventional operation, both analog
and digital (Project 25). Refer to the preceding
"Radio-Wide Features" section for information on
features common to all operating modes. Features
unique to SMARTNET/SmartZone operation are
described starting on page 23.

Monitoring Before Transmitting

Introduction
With conventional operation, you may need to
manually monitor the channel before transmitting to
make sure that it is not be used by someone else. If
your were to transmit while someone else is using the
channel, you would probably disrupt their conversa-
tion. With SMARTNET/SmartZone operation, moni-
toring is always performed automatically. Monitor
conventional channels automatically or manually as
follows:

Automatic Channel Monitoring

If the selected channel is programmed with the
Busy Channel Lockout feature (consult your system
operator), monitoring is performed automatically.
Refer to the description of this feature on page 16 for
more information.

Manual Channel Monitoring

The automatic monitoring just described may
occasionally disable the transmitter when the channel
is not in use. In this case, you may need to manually
monitor the channel as follows:
Busy Indicator - With scanning disabled, note if the
multi-function indicator on the front panel is steady
green. If it is not, the channel is not being used and a
call can be transmitted. It it is green, the channel may
be busy and a call should not be placed (see next para-
graph).
CONVENTIONAL MODE FEATURES
Monitor Mode - There may be times when a busy
condition is indicated even though no one is using the
channel. Monitoring should then be performed by
enabling the monitor mode described next. The
Normal/Selective function may also be used on analog
channels (see description on page 17).

Monitor Mode

The monitor mode temporarily disables squelch
control features (such as Call Guard squelch) and
unsquelches the receiver so that all activity on the
channel can be monitored. In addition, it overrides the
Busy Channel Lockout feature (see next section) and
temporarily disables scanning.
To select the monitor mode, briefly press the
Monitor option key or select the menu parameter. This
mode is indicated when
monitor mode and return to normal operation, press
the Monitor option key again or select "Off" in the
menu mode.
This feature may also be useful during weak
signal conditions if intermittent squelching makes a
message difficult to understand. When scanning,
pressing and holding the option key until a tone
sounds monitors the scanned channel instead of the
selected channel (if it is different).

Busy Channel Lockout

The Busy Channel Lockout feature (also called
Transmit Disable on Busy) automatically disables the
transmitter if the channel is busy when the PTT switch
is pressed. When the transmitter is disabled by this
feature, "BUSY" is displayed, a busy tone sounds, and
the transmitter is disabled. Each channel is
programmed to operate in one of the following modes:
Off - Busy channel lockout is disabled and the trans-
mitter keys even if the channel is busy.
Noise - If any activity is detected on the channel, the
transmitter is disabled when the PTT switch is pressed.
16
is displayed. To disable the
May 2002
Part No. 002-5100-100