13
CHAPTER 7: AUXILIARY MODE
Overview
By entering auxiliary (AUX) mode, the repeater's internal controller is disabled and the CS-540 may be
controlled by an external peripheral. In addition, while in AUX mode, you can adjust the display illumination
level, enable/disable the TX power amplifier, enable/disable the front panel speaker, enable/disable the
internal LTR Decoder.
Auxiliary Settings
While in auxiliary mode, you have the option of adjusting the following settings:
LCD illumination level:
To adjust the display illumination level simply press the up (
) button to cycle
through the varying degrees of illumination. Once the desired setting is achieved, press the AUX button to
exit and save the setting. Turning the illumination off will increase battery life in battery powered
applications.
TX power setting:
The RF power out can be disabled. Pressing the down (
▼
) button for approximately two
seconds will toggle the RF power amp setting. If the RF PA has been disabled, a right arrow icon (
►
) will be
displayed in the LCD. This setting is stored immediately after pressing the button. Pressing AUX again will
return to repeater mode. Please note, if the RF PA is disabled, the cooling fan will be disabled as well.
LTR Decoder:
For those who are using the CS-540 with an LTR controller, the CS-540 supports an internal
LTR decoder for diagnostic purposes. This feature is enabled/disabled by simply pressing the BASE button
while in AUX mode. The LTR Decoder is active when the LCD displays ‘d-------‘. The LTR Decoder will display
the home channel and ID of the call being repeated. For Example: ‘d-05-001’ indicates the CS-540 is
repeating user ID 001 whose home channel is 05. To deactivate the LTR Decoder, simply press the BASE
button and ‘AUX’ will be re-displayed.
Composite Input Enable/Disable:
Certain external controllers may mix the data and voice. In the event
the CS-540 is required to transmit a composite data/voice input, it will need to be set up to support the
composite signal. The composite output from the external controller is to be connected to
PIN 21
of the
ACCESSORY connector. While in AUX mode, press and hold the BASE button for approximately two seconds.
The left arrow icon (
◄
) will be displayed indicating the CS-540 is processing a composite input. Once this
input is enabled, make sure your controller is aligned for the proper TX data and voice deviations. To disable
the composite input, simply press-and-hold the BASE button for approximately two seconds. The left arrow
icon (
◄
) will disappear.
External Controllers
When in AUX mode the CS-540’s internal tone panel is disabled and total control of the repeater is
surrendered to an external peripheral such as an LTR controller or another tone panel. Please refer to
Appendix A: for the pin-out description of the CS-540 to help you make your custom cable.
When AUX
mode is entered, the circuit path is set up to where the DATA or Composite output of the external
controller has DC access to the transmitter. The CS-540 requires the DC input of the DATA or
Composite output be centered at 2.5 V DC otherwise the external peripheral could cause a DC shift
to make the CS-540 transmit off frequency. To help achieve this 2.5 V DC input requirement, the
CS-540 incorporates a DC level shifting Trim Pot (P1) on the internal accessory board. Open the
unit to access the accessory board. This is the board the accessory connector is on. With your
external controller connected, use a DC voltmeter to measure the DC input voltage on TP1. (
Located in center of board) Preferably while the controller is sending data, Adjust P1 until 2.5
Volts DC is achieved.
