AM Transmitters
132
7. Select SPEC ANL screen.
8. Set Span to 1.1 MHz.
9. Set Ref Level to place the carrier peak at the top graticule line.
To set Ref Level:
• From the Marker screen, select Marker To Peak
• Select Marker To Ref Level
10. Tune Center Freq in 1 MHz steps anywhere from 400 kHz to 1 GHz in
search of harmonics, subharmonics, multiples, or spurious emissions.
11. Un-key the Transmitter.
NOTE: If spurious emissions are suspect and verify that emissions are from the
transmitter and not another source.
To measure spurious emission of the transmitter under test:
• Place at center frequency.
• Or perform the following:
a. Select Main from the Controls field.
b. Select Markers from the Choices field.
c. Position the marker on the desired peak. (Position or Next Peak)
Marker frequency and level are displayed as shown.
Lvl
Freq
SPECTRUM ANALYZER
Marker
MHz
dBm
101.12980
-99.92
BW= 3 kHz
Spurious or Harmonic
Level & Frequency
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