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FM Transmitters
75
Measurement Procedure:
1 Connect the Transmitter 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) or permanent instrument damage
may result.
On the Test Set:
2 Press the PRESET key.
3 Press the TX key.
Using the knob and data entry keys:
4 Set Filter 1 to 300 Hz HPF.
5 Select the AF Freq Meter.
6 Select Distn from the Choices field.
7 Set AFGen1 Lvl so that displayed FM deviation is 100% of the Transmit-
ter’s specified maximum frequency deviation.
NOTE: Do not exceed the specified input level that causes maximum frequency
deviation, or the Transmitter’s modulation limiting circuits will cause added
distortion. Refer to the input level/deviation specifications for the Transmitter
being tested.
On the Radio:
8 Key the Transmitter and keep keyed until reading displays.
Distortion (in percent, or dB) is displayed on the Test Set as shown.
TX TEST
FM Deviation
TX Frequency
TX Power
Distn kHz
kHz
W
kHz
Distortion
145.279974
2.05 3.4
4.847
Deviation