Agilent Technologies HP8648A Manuale Utente Pagina 122

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AM Transmitters
121
Once the desired carrier is found:
8 From Controls, select Main.
9 Select Marker from the Choices field.
10 Use the Marker To field to select the desired carrier.
On the Test Set frequency and level are displayed as shown.
11 To demodulate the carrier:
a. With the marker on the desired carrier, select Marker To to Center
Freq.
b. From Controls, select Main.
c. Select Marker from the Choices field.
d. Decrease the Span to 1.5 MHz (or less).
e. Adjust the Volume and Squelch controls to listen to the demodulat-
ed carrier.
AM Off The Air Monitoring on a Known Transmitter Carrier Frequency
1 Press the PRESET key.
2 Press the TX key.
3 Set AF Anl In to AM Demod
4 Set Tune Mode to Manual
5 Set Tune Freq to desired frequency
6 Set Input Port to Ant
Lvl
Freq
SPECTRUM ANALYZER
Marker
Level & Frequency
displayed
MHz
dBm
101.12980
-99.92
BW= 3 kHz
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