Agilent Technologies HP8648A Manuale Utente Scaricare il pdf (Pagina 56)

100

101

FM Transmitters

Once the desired carrier is found:

7 From Controls, select Main.

8 Select Marker from the Choices field.

9 Use the Marker To field to select the desired carrier.

On the Test Set frequency and level are displayed as shown.

10 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.

FM Off The Air Monitoring on a Known Transmitter Carrier Frequency

1 Press the PRESET key.

2 Press the TX key.

3 Set Tune Mode to Manual.

4 Set Tune Freq to known frequency.

5 Set Input Port to Ant

6 Set IF Filter to 230 kHz (if necessary).

Lvl

Freq

SPECTRUM ANALYZER

Marker

Level & Frequency

displayed

MHz

dBm

101.12980

-99.92

BW= 3 kHz

1 2 ... 51 52 53 54 55 56 57 58 59 60 61 ... 319 320

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Agilent Technologies HP8648A Manuale Utente Pagina 56

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