User manual

RF Neulink NL6000 User Guide
45
Appendix A – Diagnosing and Correcting Performance
Problems
Factory technicians use the procedures in this section for initial modem
alignment. After installation, a qualified electronic technician can use these
procedures to diagnose and correct performance problems. Only an electronic
technician with training in RF radio alignment should perform these procedures.
Always perform these procedures using calibrated test equipment. Use the
following test equipment for these procedures:
• A calibrated service monitor (IFR) capable of generating and analyzing
narrow- band FM signals in the frequency band of the radio being tested.
• DC power supply capable of supplying at least 1 amp of current at 10-12V DC.
• A computer terminal capable of 9600 Baud wired as a DTE.
• A cable to connect the modem antenna output to the connector on the IFR.
Setting the Power Value
1. Set the IFR to receive at the radios transmit frequency.
2. From the terminal emulator, enter programming mode.
3. Select the active channel for the radio as follows:
• Select Radio ä Select Active Channel .
• Enter the active channel assignment for the radio. The value must
be a number in the range 01  64.
• Press ESC to return to the Main Menu .
4. Select Diagnostics ä Transmit Continuous Random Data .
5. Set the power value as follows:
• Select Power from the Diagnostics menu.
• While watching the power gauge, change the power value and
check the gauge to see that the power value registers correctly.
The value must be a number in the range 0  1023.
6. Select None from the Diagnostics menu to stop the data transmission.
Setting the Frequency Trim (includes setting Power)
The power setting affects the frequency trim in the NL6000, so part of
setting the frequency trim is setting the power.
1. Set the IFR to receive at the radi os transmit frequency.
2. From the terminal emulator, enter programming mode.
3. Select the active channel for the radio as follows:
• Select Radio ä Select Active Channel .