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Analog Out
The "Analog Out" connector (SMB) is located at the analyzer's front panel. It is a multi-purpose output, whose
function depends on options and operating mode (active application). When the N9063A Analog Demod
application is active, this output carries a voltage waveform reconstructed by a real-time hardware demodulator
(designed to drive the "Demod to Speaker" function for listening). The processing path and algorithms for this
output are entirely separate from those of the N9063A application itself; the Analog Out waveform is not
necessarily identical the application's Demod Waveform.
Description
Output impedance
a
Output range
FM range
FM scaling
Analog out scale adjust
FM offset
a.
For AM, the output is the "RF envelope" waveform. For FM, the output is proportional to frequency-deviation;
note that Carrier Frequency Error (a constant frequency offset) is included as a devi- ation from the analyzer's
tuned center frequency, unless a HPF is used. For PM, the output is proportional the phase-deviation; note that PM
is limited to excursions of +pi, and requires a HPF on to enable a phase-ramp-tracking circuit.
Most controls in the N9063A application do not affect Analog Out. The few that do are:
* choice of AM, FM, or PM (FM Stereo not supported)
* tuned Center Freq
* Channel BW (affects IF filter, sample rate, and FM scaling)
* some post-demod filters and de-emphasis (the hardware demodulator has limited filter choices; it will attempt
to inherit the filter settings in the app, but with constraints and approximations)
90
Specifications
Supplemental Information
14 W (nominal)
0 V to +1 V (typical)
Deviation up to 40 MHz
Rate: between 20 Hz and 20 kHz
(1 / Channel BW) V/Hz (nominal), + 10% (nominal),
where the Channel BW is settable by the user.
User-settable factor, range from 0.5 to 10, default =1,
applied to above V/Hz scaling.
If HPF is off: 0 V corresponds to SA tuned frequency, and
Carrier Frequency Errors (constant frequency offset) are
included (DC coupled);
If HPF is on: 0 V corresponds to the mean of peak-to-peak
FM excursions.
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