HP 8920A Application Handbook page 62

FM Transmitters
Measurement Procedure:
1 Connect the Transmitter Under Test as shown.
CAUTION: The RF present at the Test Set RF IN/OUT connector must not exceed 60W
continuous (or 100 Watts for 10 sec/minute).
On the Test Set:
2 Press the PRESET key.
3 Press the TX key.
On the Radio:
4 Key the Transmitter and keep keyed until the remaining steps are complete.
On the Test Set using the knob and data entry keys:
5 Set AFGen1 Lvl so that displayed FM deviation is 60% of the Transmit-
ter's specified maximum frequency deviation (typically 3 kHz).
On the Test Set measured FM Deviation is displayed as shown.
To measure FM symmetry on the Test Set:
6 Set Detector to Pk−.
7 Record the displayed FM Deviation as Pk−.
8 Set Detector to Pk+.
60
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
TX TEST
TX Frequency FM Deviation
kHz
144.680040
TX Power W AF Freq
0.591 1.00007
AFGen1 Freq
Tune Mode Input Port AF Anl In
Auto/Manual RF in/Ant FM Demod
Tune Freq AFGen1 Lvl
IF Filter Filter 1
145.280000 15 kHz 300Hz HPF
MHz Filter 2
3kHz LPF
TX Pwr Zero Ext TX Key De-Emphasis
Zero On/Off 750 us/Off
Detector
Pk+-Max
Deviation
kHz
2.971
kHz
To Screen
1.0000 RF GEN
MHz
RF ANL
AF ANL
-45.5 SCOPE
dBm
SPEC ANL
ENCODER
DECODER
RADIO INT
More