Harris Constellation, Installation & Maintenance

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Harris Corporation Constellation™
Transmitter Frequency Measurement 8-3
ROUTINE
MAINTENAN
C
E
Transmitter Frequency Measurement
The reason for performing these procedures is to ensure that the Transmitter
Assembly is operating on the correct frequency and power level to comply with
the license requirements. (Example: FCC Title 47, Part 101.107, 101.111,
101.113, and 101.217.) It also ensures that the residual BER floor and
acquisition time remain within specification.
1. Record the operating frequency of the Transmitter from the Keypad
(hidden menu).
CONFIGURATION > F1 + F3 or Ctrl B > TX FREQ
2. This frequency should match the one written on the Tx filter and the
station authorization.
3. Determine from the table in Appendix C , which multiplier-filter should be
used (or is in use).
The Transmitter Assembly should be plugged into the
rack and powered for at least 30 minutes prior to
adjusting the frequency. The position of the TX On/OFF
switch does not affect the measurement. The power
supply should be ON.
The Frequency Counter should be plugged in and
powered for at least 30 minutes prior to adjusting the
frequency.
4. Connect a frequency counter to the REF MON port on the Transmitter
Assembly (
Figure 8-1 ).
5. To adjust the frequency, use the hidden Keypad command
CONFIGURATION > F1 + F3 or Ctrl B > TX 100MHZ TUNE