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CHAPTER 6: BASE STATION MODE
Overview
In addition to its repeater features, the CS-540 can also be operated as a base station. While in base station
mode, the system operator can communicate with any user on the selected channel.
Operation
To switch from repeater mode to base station mode, simply press and release the button on the front panel
labeled BASE. The BASE LED will illuminate. The BASE LED will stay lit during base station operating mode.
The first time that base station mode is entered, the CS-540 will default to the user in Slot 1. Any subsequent
time that base station mode is entered, the user that was active the last time that the CS-540 was in base
station mode will be selected. The CS-540 will turn on the front panel speaker by default. The received audio
volume may be adjusted. The internal or external speaker may be turned on/off by pressing the MON button
to sequence options. The CS-540 will now only validate signaling received from the selected user. When the
base station operator initiates a transmission, it will be on the selected users transmit squelch option.
Different users on the channel may be selected by pressing the up or down buttons to scroll through the user
lists. Users deactivated in repeater mode will have the left-arrow icon (◄) illuminated in the upper left corner
of the display, however, during Base Station mode, it is permissible to transmit using a deactivated user’s
tone/code. In order to exit base station mode, simply press the BASE button again. The CS-540 will then re-
enter repeater mode.
Base Station Settings
The behavior of the CS-540 in base station mode depends on the various base station settings. Base station
settings are programmed by using the PGM-540 programmer. Remote mode cannot be entered during Base
station mode. It is also important to remember that all per user transmit options (courtesy tone, hang time,
and Tone-in-Tail) are inherited when transmitting to that user.
CSQ Unmute: By default the CS-540 will unmute the speaker only when valid signaling is decoded. Enabling
this feature defeats the selected squelch option so that sufficient carrier will cause the speaker to unmute.
Busy Lockout: This setting prevents the operator from transmitting while the selected channel is busy. If the
operator attempts to transmit while receiving a call, the CS-540 will not acknowledge the attempt.
Busy Queuing: This setting will cause the CS-540 to queue the TX request if the operator attempts to
transmit while the selected channel is busy. If the TX attempt is queued, the busy system queue alert (three
700 Hz tones) will sound and QUEUED will be displayed on the LCD. When the channel becomes free, the CS-
540 will attempt to access the channel. If successful, the busy system access alert (five 700 Hz tones) will
sound and the CS-540 will begin transmitting. The CS-540 will hold the channel for the programmed System
Hold Time. If the operator fails to PTT before the System Hold Time timer expires, the CS-540 will stop
transmitting and the system not accessed alert (a two second 500 Hz tone) will sound and QUEUED mode will
be exited.
Busy Queue Timeout: If Busy Queuing is enabled, this timer determines how long a TX request will wait in
queue. If Busy Queuing is not enabled, this timer has no relevance. The Busy Queue Timeout has a range of
0 to 65,535 milliseconds.
System Hold Time: If Busy Queuing is enabled, this timer determines how long the CS-540 will hold the
channel once the transmit request is processed. If Busy Queuing is not enabled, this timer has no relevance
and it will not be used. The System Hold Time has a range of 0 to 65,535 milliseconds.
Marked Idle: Marked Idle permits the operator to transmit even if the CS-540 is receiving a valid call. If
valid signaling is not present, the call attempt will be either rejected or queued. This means Marked Idle must
be used in conjunction with Busy Lockout, or both Busy Lockout and Busy Queuing. If Marked Idle is used
with just Busy Lockout, the TX attempt will be rejected if the channel is busy but valid signaling is not present.
If valid signaling is present, the user may transmit. If Marked Idle is used with Busy Lockout and Busy
Queuing, the TX attempt will be queued if valid signaling is not present. Otherwise, the user may transmit.
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