FM Transmitters
77
Measurement Procedure:
1Connect 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:
2Press the PRESET key.
3Press the TX key.
On the Radio:
4Key the Transmitter and keep keyed until the remaining steps are complet-
ed.
On the Test Set using the knob and data entry keys:
5Set AFGen1 Lvl so that displayed FM deviation is 50% of the Transmit-
ter’s specified maximum frequency deviation (typically 2.5 kHz).
6Set AFGen1 Lvl units to dBm.
7Increase (more positive) AFGen1 Lvl by 16 dB.
8Select SPEC ANL.
9Set Span to 1.1 MHz.
10 Set Ref Level to place the carrier peak at the top graticule line.
Test Set Options Required Spectrum Analyzer/Tracking Generator (option 102)
Special Test Considerations
Cable and adapter mismatch must be considered when
measuring harmonics and spurious emissions of a trans-
mitter. If an external attenuato r is used, special care must
be taken to ensure the attenuator is not causing any spuri-
ous or harmonic emission. Also, if spurious emissions are
located, verify that the transmitter is the source, and not
another object radiated emissions near the test site.