Operating Manual

5-2 5100 ES Models II/III Portable Radio Operating Manual March 2008
Conventional Mode Features
5.1.2 Manual Channel Monitoring
The automatic monitoring just described may occasionally disable the transmitter when
the channel is not in use, such as if the repeater has extended hang time. In this case, you
may not want to use automatic monitoring, but monitor the channel manually as follows:
Busy Indicator - With scanning disabled, note if the multi-function indicator on the
front panel is steady green. If it is steady green, a carrier is being detected, so the
channel may be busy (see see Monitor Mode, following). If it is not, the channel is not
being used and a call can be transmitted.
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 disabling Call
Guard squelch (or talk group ID detect on Project 25 channels). This is usually done by
selecting the Monitor Mode (see following) or by the Normal/Selective option switch or
menu parameter (see Section 5.4.4).
5.2 Monitor Mode
The monitor mode unsquelches the receiver and monitors the channel even if a carrier is
not detected. Other features of this mode are as follows:
• Call Guard (CTCSS/DCS) squelch is disabled on analog channels and NAC and talk
group ID detect are disabled on P25 (conventional) channels.
• Busy Channel Lockout is overridden (see next section)
• Scanning temporarily halts
The Monitor Mode operates as follows:
1 To monitor the transmit frequency for activity before transmitting, briefly press the
Monitor option switch or select the Monitor menu “Tx Channel” parameter. The
icon is then displayed to indicate the monitor mode. The receiver unsquelches and noise
is heard even if carrier not present.
2 To monitor the receive frequency instead, press and hold the Monitor option switch
until a tone sounds or approximately two seconds, or select the Monitor menu “Sqlch
Ovrd” parameter. This can be used, for example, to improve reception if intermittent
squelching is making a weak message difficult to understand.
3 To disable the monitor mode and return to normal operation, press the Monitor option
switch again or select the Monitor menu “Off” parameter.
The Normal/Selective function disables Call Guard squelch and P25 group ID detect but
not scanning and P25 NAC detect (see Section 5.4.4).