9/15/06
888-2586-001
4-47
WARNING: Disconnect primary power prior to servicing.
Section 4 Overall System Theory
Platinum Z16HD+
4.8.2.3
APC Factor
APC_Factor is also calculated during the Forward power calibration. APC_Factor
allows the micro to calculate the necessary DAC_APC_REF number to obtain any
specific power level. For the Z16HD+, APC_Factor is calculated as Forward calibration
power divided by the DAC_APC_REF number or:
APC_Factor = FWD PWR (kW) / DAC_APC_REF
APC_Factor = 7000W / 660 = 10.61
Once the APC_Factor is known, the controller uses this number to calculate the
DAC_APC_REF necessary to obtain the MAX HIGH, MAX LOW and UPS power
levels in the Diagnostics Display.
4.8.2.3.1 Operating APC versus Calibrated APC
There are actually 2 APC_Factors due to the fact that the directional coupler outputs are
not flat across the entire FM band. They are:
[HOME, MORE, CONFIGURATION, C, A, A, D]
•
CAL_APC_Factor (Calibrated APC_Factor)
•
OP_APC_Factor (Operating APC_Factor)
The Operating APC Factor is frequency compensated based on the slope of the coupler
output (1.8dB across the FM Band 88-108MHz). If the transmitter is operating at the
same frequency at which it was calibrated then the two numbers will be the same.
If the operating frequency is changed, the OP_APC_Factor will be higher or lower
depending on whether the frequency went down or up compared to the calibrate
frequency. This means that if the exciter frequency is changed the transmitter
calibration can be maintained by simply changing the OPERATING_FREQUENCY in
the Diagnostics Display.
4.8.2.4
MAX HIGH, MAX LOW and UPS Power Levels
•
MAX HIGH, MAX LOW and UPS power levels are set using the Diagnostics Dis-
play and stored in the EEPROM, U39.
•
MAX HIGH SET screen [HOME, MORE, CONFIGURATION, B, C] Then choose
the desired modulation format to set the maximum power level when the HIGH ON
button is pressed.
•
MAX LOW SET screen [HOME, MORE, CONFIGURATION, B, D] Then choose
the desired modulation format to set the Maximum power level when the LOW ON
button is pressed.
Summary of Contents for Platinum Z16HD+
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