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GV5/GV3.5 OPERATIONS & MAINTENANCE MANUAL OPERATING THE TRANSMITTER
PAGE 3.2.106 VERSION 0.2 2014-07-23
IBOC Settings
The IBOC Settings page (see Figure 3.2.90 ) allows users to establish Forward Tap Delay, FM+HD Low Inj
Gain, FM+HD High Inj Gain and HD only system Gain levels. It also allows for an IBOC power
calibration. Changes apply to the active exciter (A or B) only. To calibrate the other exciter, switch to the
other exciter and repeat the change.

Forward Tap Delay
- Displays the time delay (in unit taps) between the forward path signal from the
exciter and the reverse path signal into the exciter, fed back from the output of the transmitter. This
value is factory set (to synchronize the phase of the forward and reverse signals so that pre-
correction can operate properly) and should not require any adjustment in the field.

Auto-Find Gain
- Press the Start button to automatically find the optimized gain while the
transmitter is RF On and in the applicable preset mode/injection level.

FM+HD Low Inj Gain
- Applicable for FM+HD mode only (at -20 dBc to -15.1 dBc injection levels)
and represents the starting/default gain applied to the forward path signal within the exciter at
initial turn on/ramp-up.

FM+HD High Inj Gain
- Applicable for FM+HD mode only (at -15 dBc to -10 dBc injection level) and
represents the starting/default gain applied to the forward path signal within the exciter at initial
turn on/ramp-up.

HD Gain
- Applicable for HD mode only and represents the starting/default gain applied to the
forward path signal within the exciter at initial turn on/ramp-up.

IBOC Power Calibration
- This calibration occurs at the factory and should not require any
adjustment in the field. This calibration is performed in FM mode.

Calibration Value
- Displays the calibration of the exciter’s measurement of the transmitter power.