Agilent Technologies HP8648A Manuale Utente Scaricare il pdf (Pagina 79)

100

101

FM Transmitters

To set Ref Level:

• From the Marker screen, select Marker To Peak

• Select Marker To Ref Level

11 Tune Center Freq in 1 MHz steps anywhere from 400 kHz to 1 GHz in

search of harmonics, sub-harmonics, multiples, or spurious emissions.

NOTE: If spurious emissions are suspect, un-key the Transmitter, 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

1 2 ... 74 75 76 77 78 79 80 81 82 83 84 ... 319 320

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Agilent Technologies HP8648A Manuale Utente Pagina 79

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