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RF OUTPUT
Range
-140 dBm to +13 dBm, 0.1 dB resolution. When AM is selected, the
maximum RF output level decreases linearly with increasing AM depth
to +7 dBm at 99.9% depth.
RF Level Units
Units may be set to ìV, mV, EMF or PD; dB relative to 1 ìV 1 mV EMF
or PD; or dBm. Conversion between dB and linear units may be
achieved by pressing the appropriate units key (dB or V, ìV, mV.) The
output level can be normalized for 75 Ù operation with an impedance
converter.
Level Accuracy(1)
Frequency >-127 dBm >-100 dBm Temp
Coefficient
9 kHz to 1.2 GHz ±0.8 ±0.8 ±0.02 dB/°C
1.2 GHz to 2.05 GHz ±1.4 ±1.2 ±0.03 dB/°C
2.05 GHz to 2.51 GHz ±1.6 ±1.6 ±0.03 dB/°C
(1) Over range +17°C to +27°C
Attenuator Hold
Selection of Attenuator hold provides for uncalibrated level reduction of
at least 10 dB without the Mechanical Attenuator operating.
VSWR
For output levels less than -5 dBm, output VSWR is less than 1.3:1 for
carrier frequencies up to 1.2 GHz and less than 1.5:1 for carrier frequencies
up to 2.51 GHz.
For output levels greater than -5 dBm output VSWR is less than 1.5:1
for all carrier frequencies.
RF Output Connector
50 Ù type N connector to MIL-PRF-39012
Output Protection
Protected from a source of reverse power up to 50 W from 50 Ù or 25
W from a source VSWR of 5:1. Protection circuit can be reset from the
front panel or via the GPIB/RS-232 interfaces.
SPECTRAL PURITY
At RF levels up to +7 dBm:
Harmonics
Typically better than -30 dBc for RF levels up to +7 dBm.
Typically better than -25 dBc for RF levels up to +13 dBm.
Sub- and Non-Harmonics (for offsets >3 kHz)
Better than -70 dBc to 1 GHz, better than -64 dBc between 1 and
2.05 GHz better than -60 dBc above 2.05 GHz.
Residual FM (FM off)
Less than 4.5 Hz RMS deviation in a 300 Hz to 3.4 kHz unweighted
bandwidth at 1 GHz.
SSB Phase Noise
Better than -124 dBc/Hz at 20 kHz offset from a carrier frequency of
470 MHz, typically -121 dBc/Hz at 20 kHz offset from a carrier frequency
of 1 GHz.
Carrier leakage
Less than 0.5 ìV PD at the carrier frequency in a two turn 25 mm
diameter loop, 25 mm from the surface of the
signal generator.
ÖM on AM
Typically 0.1 radians at 30% depth at 470 MHz.
MODULATION MODES
Internal and external modulation can be simultaneously enabled to
allow combined amplitude and frequency (or phase) modulation.
Pulse modulation can be used in combination with the other forms of
modulation.
FREQUENCY MODULATION
Resolution
1 Hz
Deviation
CW Range (MHz) Max Deviation (kHz)
1200 - 2510 12800
600 - 1200 6400
300 - 600 3200
150 - 300 1600
75 - 150 800
37.5 - 75 400
18.75 - 37.5 200
0.009 - 18.75 100
Accuracy at 1 kHz
±4%
Bandwidth (1 dB)
DC to 275 kHz (DC coupled)
10 Hz to 275 kHz (AC coupled)
20 Hz to 275 kHz (AC coupled with ALC)
Group delay
Less than 5 ìs to 100 kHz
Carrier frequency offset (DC coupled)
Less than 1% of the set frequency deviation
Distortion
<1% at 1 kHz rate for deviations up to 20% of max available deviation,
typically 0.1% for deviations of 2% of max available deviation and
<3% at max available deviation
Modulation source
Internal LF generator or external via front panel BNC
FSK
Modes
2 level or 4 level FSK
Data source
External data connected to TRIGGER connector (2 level) or TRIGGER
and PULSE connectors (4 level)
Note with option 7 fitted, rear panel PULSE input is labelled FSK2
Frequency shift
Settable up to ±100 kHz
Accuracy
As FM deviation accuracy
