GAI-Tronics ICP9000 Navigator Series Console Installation and Service Manual - Manual (Page 19)

ICP9000 Navigator Installation and Service Manual Installation
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Line Level Settings
The ICP9000 Navigator Console allows the installer to adjust level settings through the on-screen
diagnostics. These procedures assume that the base stations have been properly adjusted.
Line Input (Receive Audio) Level Adjustment
The line input level adjustment allows the receive audio of each channel to be compensated for line loses
between the base station and console, ensuring the optimum audio performance of the console. It is
important to set this level properly as maladjustment can cause distortion or over-compression of the
receive audio.
1. Adjust the base station receive audio level to the console by applying an RF signal modulated with a
1000 Hz tone at rated system deviation to the base station receiver.
2. Adjust the base station output control for the desired level (e.g. –10 dBm) to the audio control line.
Do not exceed the line supplier’s recommended maximum operating level.
Navigator MCU Adjustment
1. Connect an ac voltmeter, or other appropriate measuring device, across the receive audio pair of the
console MCU according to Table 8. Make a note of the measurement.
2. Enter the Navigator Diagnostics. Select S ERVICE D IAGNOSTICS , then A UDIO . Enter the password 1490 ,
and select I NPUT L EVEL .
3. Use the channel VOL Up/Down buttons to select the proper input level settings. The level can be
changed in 3 dB increments. Select the setting that is closest to, but not higher than, the measured
level. For example, if the measured level is –11 dB, the console should be set at a –12 dB input
sensitivity setting.
4. Repeat this process for each channel.
5. Press the MODE button when the setting is complete. When prompted, press 1 to save, or 2 to
abandon changes.
Line Output (Transmit) Level Adjustment
The output of each channel can be adjusted to accommodate for line losses from the console to the base
station. Adjustment of the line out should be similar to that of the line input adjustment where the audio
level at the base station is measured while the output level of the console is adjusted to achieve the
optimum audio level at the base station.
1. Connect an ac voltmeter, or other appropriate measuring device, across the transmit audio pair at the
base station. Refer to Table 8 for the correct test connections.
2. Enter the Navigator Diagnostics. Select S ERVICE D IAGNOSTICS , then A UDIO . Enter the password 1490 ,
and select O UTPUT A DJUST .
3. The MCU will produce a 2175 Hz signal output on all channel audio pairs. Refer to Table 8 for the
correct connections.
4. Use the channel VOL Up/Down buttons to raise or lower the output level of the MCU channel.
5. Repeat this process for each channel.
6. Press the MODE button when complete. When prompted, press 1 to save, or 2 to abandon changes.