User Manual

Table Of Contents
RF-Orchestra!™ Transmitter Installation and Operation Operation
July 2000 6880493G02-C 5-27
actual power output. The calibration factor ranges from 0.8 to 1.2. See paragraph , "Check
Front Panel Indications" in Chapter 6, "Maintenance" for detailed instructions on wattmeter
calibration.
Amplitude Alignment
Once the wattmeters are calibrated, the power output can be aligned. Power amplitude
alignment allows the transmitter to output the desired per-subchannel power, based on a
known power output with a single FM subchannel.
When amplitude alignment is performed, the RF-O! transmitter software creates two tables of
values: one for AM (voice) and one for FM transmissions. When the RF-O! transmitter receives
a control command from the RF-B! transmitter controller defining the next keyup modulation
and number of subchannels, the correct values are sent to the various DSPs and the Exciter to
assure that the power output per-subchannel is at the desired level. To view these values,
enter the RFO FIPS: a 87 0 (FM) and a 87 1 (AM) commands (See Figure 5-15).
Figure 5-15: Power Amplitude Control Parameters
RFO FIPS: a 87 1
RFO FIPS: RA 87
<<< AM AMPLITUDE CONTROL PARAMETERS >>>
Number of Subchannels
Align 1 2 3 4
-------------------------------------------------------
Power 150 69 69 0 0
K-Factor 990 1.000000 0.678233 0.959166 0.000000 0.000000
Fdback Atten 996 255 229 229 0 0
Phase Trng 982 -10000 -14000 -14000 0 0
Txlin Reg2 954 84 84 20 0 0
Txlin Reg1 953 14 14 14 0 0
Txlin Atten 974 0 0 0 0 0
Mod Dev 2053 4800 4800 4800 0 0
FM Power Lvl 2054 28000 28000 28000 0 0
AM Pilot Pwr 2055 1600 1600 1600 0 0
AM Sdbd Pwr 2056 12426 12426 12426 0 0
-------------------------------------------------------
=============================================
RFO FIPS: a 87 0
RFO FIPS: RA 87
<<< FM AMPLITUDE CONTROL PARAMETERS >>>
Number of Subchannels
Align 1 2 3 4
-------------------------------------------------------
Power 150 50 50 50 0
K-Factor 990 0.408269 0.235714 0.471428 0.707168 0.000000
Fdback Atten 996 255 255 255 255 0
Phase Trng 982 -10000 -14000 -14000 -14000 0
Txlin Reg2 954 84 84 20 20 0
Txlin Reg1 953 14 14 14 14 0
Txlin Atten 974 0 0 0 0 0
Mod Dev 2053 4800 4800 4800 4800 0
FM Power Lvl 2054 28000 28000 14000 9333 0
AM Pilot Pwr 2055 1600 1600 1600 1600 0
AM Sdbd Pwr 2056 12426 12426 12426 12426 0
-------------------------------------------------------
=============================================