INSTALLATION AND DISASSEMBLY
1.Monitor the transmit signal with a communications monitor. Set it for HPF = Off, LPF = 20 kHz, De- emphasis = Off, and Level =
2.Select a channel near the center of the band and turn a long tone on (see preceding “NOTE”) by pressing the appropriate front panel key.
3.Adjust potentiometer R18 (DEV) on the module for the following deviation:
25 kHz Channel Spacing - ±3.5 kHz
20 kHz Channel Spacing - ±2.8 kHz
12.5 kHz Channel Spacing - ±1.7 kHz
4.Check channels on each end of the operating band to make sure deviation is within the following limits. If not, repeat preceding adjustment.
25 kHz Channel Spacing - ±3.0 to 5.0 kHz 20 kHz Channel Spacing - ± 2.4 to 4.0 kHz 12.5 kHz Channel Spacing - ±1.5 to 2.5 kHz
NOTE: It is recommended that scanning not be used with these options because in may cause part or all of the tone burst to be missed.
November 1998 |
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Part No. |
