Giga-tronics GT 9000, Operation & Maintenance Manual

Page: 29 / 238

1.3.10 FM Envelope Parameters (Wide or Narrow Mode)
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NOTE: Frequency Modulation (FM) specifications apply with Scan/AM and PM off.
FM may be operated simultaneously with AM or PM.
Distortion: <5%
Incidental AM: <+0.2%/MHz of deviation
Modulation Accuracy: +5%, at maximum deviation and a 1 kHz rate.
1.3.11 FM Envelope Parameters (Wide Mode)
Max Deviation: 2.5 MHz peak (<2 GHz);
10 MHz peak (>2 GHz).
For 2-26 GHz instruments: 10 MHz peak (>2 GHz).
Flatness: +2 dB for rates from 10 Hz to 1 MHz;
+3 dB for rates from 1 to 5 MHz.
Residual FM (50 Hz to 15 kHz
post-detection bandwidth): <750 Hz, typical (<2 GHz);
<3 kHz rms, typical (>2 GHz).
For 2-26 GHz instruments: <3 kHz rms, typical (>2 GHz).
1.3.12 FM Envelope Parameters (Narrow Mode)
Max Deviation:
The lesser of 25
×
F
mod
or 2.5 MHz, peak (<2 GHz);
the lesser of 100
×
F
mod
or 10 MHz, peak (>2 GHz).
For 2-26 GHz instruments: the lesser of 100 x F
mod
or 10 MHz, peak (>2 GHz).
Flatness: +2 dB for rates from 20 kHz to 1 MHz;
+3 dB for rates from 1 to 5 MHz.
Residual FM: The same as for an unmodulated RF output (see
Spectral Purity).
1.3.13 FM Indicator
Readout: 6 digits; displays deviation (also displays rate, if
Option 24 is installed).
1.3.14 Internally Generated FM Envelope (Option 24 only)
Waveform: Sine, square, or triangle wave.
Rate: 10 Hz to 1 MHz
Resolution: 1 Hz
Accuracy: +0.01 Hz
Introduction
Manual No. 120AM00250, Rev C, September 1998
1-9