Platinum Z5 CD - APC Factor; MAX HIGH, MAX LOW and UPS Power Levels

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WARNING: Disconnect primary power prior to servicing.
Overall System Theory
4.7.2.3 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 Z5, 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 = 5kW / 660 = 7.58
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.
4.7.2.3.1 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,D,C]
• 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 and is the factor calculated above. 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.
4.7.2.4 MAX HIGH, MAX LOW and UPS Power Levels
MAX HIGH, MAX LOW and UPS power levels are set using the Diagnostics
Display and stored in the EEPROM, U39.
MAX HIGH SET screen [HOME, MORE, CONFIGURATION B,B] sets the
maximum power level when the HIGH ON button is pressed.
MAX LOW SET screen [HOME, MORE, CONFIGURATION B,C] sets the
Maximum power level when the LOW ON button is pressed.
UPS SET Screen [HOME, MORE, CONFIGURATION B,D,A] sets the power level
when the transmitter is operating on a backup UPS or generator AC supply.