Anritsu MT8802A - A16 AF Adjustments

Section 5 Total Adjustment
5-8
5.6 A16 AF
5.6.1 SG1 FM deviation adjustment
(1) Setting of measurement system
MT8802A
RF Input=“AUX”
Analog measure-RX measure
AF Osc.1=“off”, AF Osc.2=“off”, Ext. FM deviation=35 kHz
RF output level=–3 dBm
HP8903 Audio Analyzer
AF Frequency=“1 kHz”
AF Level=“1.414Vrms”
Output impedance=“600 Ω”
HP8901 Modulation Analyzer
HPF=“50 Hz”
LPF=“3 kHz”
De-emphasis=“off”
• Input the HP8903 AF output to the MT8802A Ext FM Input terminal.
• Connect the MT8802A RF output (AUX Output) to the HP8901 RF input ter-
minal.
(2) Adjust the R19 (FM1 variable resistor) so that the HP8901 measurement result
(FM deviation (p-p)/2) is within 35 kHz ±1%.
5.6.2 AF Osc.1 level adjustment
(1) Setting of measurement system
MT8802A
RF Input=“AUX”
Analog measure-RX measure
AF Osc.1 Freq.=“1 kHz”, Deviation=“35 kHz”
AF Osc.2=“off”, Ext. FM=“off”
RF Output level=–3 dBm
HP8901 Modulation Analyzer
HPF=“50Hz”
LPF=“3 kHz”
De-emphasis=“off”
• Connect the MT8802A RF output (AUX Output) to the HP8901 RF input ter-
minal.
(2) Adjust the R47 (DA1 variable resistor) so that the HP8901 measurement result
(FM deviation (p-p)/2) is within 35 kHz ± 1%.