CHAPTER 9: ALIGNMENT
Overview
The CS-540 is designed to operate in a wide range of the RF spectrum and the repeater is factory aligned to
work at any frequency within that spectrum. However, because the repeater operates on a single transmit
frequency at a time, you will likely want to optimize performance for that frequency. The CS-540 is equipped
with the ability to fine-tune the repeater’s operation at a specific transmit frequency.
If you ordered the CS-540 with custom programming, then it should already be aligned to operate at its
programmed frequency. If you ordered the CS-540 without custom programming, then it is advised that you
follow the alignment procedures in this section. In addition, anytime you change the transmit frequency for
any channel, it is necessary to fine-tune the alignment for that channel.
NOTE: Since the CS-540 is a multi-channel repeater with the capability to operate at a different
frequency on each channel, you will need to align each channel individually.
Parameters
During the alignment process, you will have the opportunity to fine-tune all of the listed parameters below.
The heading of each bullet (all caps in bold) is the abbreviated name of the parameter that you will see in the
CS-540’s display during the alignment process.
• DEFAULT: Allows for restoring factory defaults for all parameters listed below.
• AL-GAIN: This parameter controls the received audio gain. You need to adjust this parameter to attain optimum
audio deviation for the given channel spacing (12.5 kHz or 25 kHz). AL-GAIN ranges from -4.0dB to 3.5dB in 0.5 dB
steps, for a total of sixteen possible settings.
• AL-AMP: This parameter controls the gain before limiter. It used in conjunction with AL-GAIN to attain optimum
audio deviation for the given channel spacing (12.5 kHz or 25 kHz). AL-AMP ranges from 0.0 dB to 35 dB, with roughly
3.3-3.4 dB steps above 15 dB. There are eight possible settings, including 0.0 dB, 15.0 dB, 18.3 dB, 21.7 dB, 25.0 dB,
28.3 dB, 31.7 dB, and 35.0 dB.
• SUB DEV: This parameter controls the deviation level of the transmitted sub audible tone/code.
• TX-DEV: This parameter controls the overall TX deviation. It is highly recommended that prior to adjusting this
setting, AL-GAIN, AL-AMP, and SUB DEV have already been tuned. When adjusting this setting, be mindful of the FCC
regulations for the selected channel spacing so as not to over deviate.
• TX FREQ: This parameter controls the temperature-controlled crystal oscillator (TCXO) voltage. The TCXO is adjusted
at the factory to work across the repeater’s RF operating range. You can adjust the TX FREQ parameter to fine-tune
the TCXO voltage for the selected frequency.
• TX PWR: This parameter controls the power level. It is used in conjunction with the factory aligned settings for low
and high power to achieve the desired power level at the selected transmit frequency.
Restoring Factory Default Alignment
To restore the factory default alignment settings, perform the following procedure:
1) In repeater mode on the selected channel you wish to restore, press and hold the AUX button for
approximately two seconds. The word DEFAULT is displayed and the TX LED is illuminated. Note: No RF
power is emitted.
2) Press and release the UP or DOWN button. This restores the factory defaults. The CS-540 responds by
displaying DONE.
3) To exit, press and release the AUX button again. The selected channel’s name is displayed for
approximately two seconds and then a series of dashes is displayed.
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