1-5
Operation
Quick Overview
7. Modulation Source
Press MOD ON/OFF to turn on or off the modulation source. Press INT 400 kHz or INT 1 kHz to
select one of the internal source tones for modulating the RF output signal. These tones
are also available as an output signal at the MOD INPUT/OUTPUT port when they are
selected. Press
EXT AC or EXT DC to ac- or dc-couple an external audio source via the MOD
INPUT/OUTPUT port.
Press
1kHz + EXT DC to frequency modulate the RF signal with the internal 1 kHz tone and
an external source at the same time. (Additional internal plus external modulation
capabilities are available for GPIB operation.)
1kHz + EXT DC will also amplitude or phase
modulate the RF signal with the internal 1 kHz tone but it will not be dc-coupled.
If Option 1EP is present, the
INT 1kHz (FREQUENCY) key, or if Option 1E2 is present, the
INT 1kHz (FREQUENCY/WAVEFORM) key scrolls between five states: a fixed 1 kHz
internal source and a variable-frequency internal source with four different waveform
selections. The four modulation waveforms are sine, triangle, square, and sawtooth (or
ramp).
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