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GENERAL INFORMATION
1-4
FREQUENCY MODULATION
Deviation range
0 to 100 kHz.
Resolution 3 digits or 1 Hz.
Accuracy ±5% at 1 kHz modulation rate.
Bandwidth (1 dB) DC to 100 kHz (DC coupled),
10 Hz to 100 kHz (AC coupled),
20 Hz to 100 kHz (AC coupled with ALC).
Group delay:
Less than 5 µs to 100 kHz.
Carrier frequency offset Less than 1% of the set frequency deviation when DC coupled.
Distortion Less than 3% at 1 kHz rate for deviations up to 100 kHz.
Typically <0.5% at 1 kHz rate for deviations up to 10 kHz.
Modulation source Internal LF generator or external via front-panel BNC.
FSK
Modes 2 level or 4 level FSK.
Note that 4 FSK is not available with Option 11 Fast Pulse fitted.
Data source External data connected to TRIGGER INPUT connector (2 level) or TRIGGER INPUT
and PULSE INPUT connectors (4 level).
Frequency shift:
Settable up to ±100 kHz.
Accuracy As FM deviation accuracy.
Timing jitter
±3.2 µs
Filter
8
th
order Bessel, −3 dB at 20 kHz.
PHASE MODULATION
Deviation 0 to 10 radians.
Resolution 3 digits or 0.01 radians.
Accuracy at 1 kHz ±5% of indicated deviation excluding residual phase modulation.
Bandwidth (3 dB) 100 Hz to 10 kHz.
Distortion Less than 3% at 10 radians at 1 kHz modulation rate. Typically <0.5% for deviations up
to 1 radian at 1 kHz.
Modulation source Internal LF generator or external via front-panel BNC.
AMPLITUDE MODULATION (for
carrier frequencies <500 MHz, usable
to 2 GHz)
Range 0 to 99.9%.
Resolution 0.1%.
Accuracy
±5% of set depth at 1 kHz rate at +17°C to 27°C ambient temperature.
Temperature coefficient <0.02% per °C.
Bandwidth (1 dB) DC to 30 kHz (DC coupled),
10 Hz to 30 kHz (AC coupled),
20 Hz to 30 kHz (AC coupled with ALC).
Distortion Less than 2.5% at 1 kHz rate for modulation depths up to 80%,
Less than 1.5% at 1 kHz rate for modulation depths up to 30%.
Modulation source Internal LF generator or external via front-panel BNC.
PULSE MODULATION
Carrier frequency range 32 MHz to 2.4 GHz, usable to 10 MHz.
RF level range Maximum guaranteed output is reduced to +20 dBm, +14 dBm above 1.2 GHz.
RF level accuracy When pulse modulation is enabled, adds ±0.5 dB to the RF level accuracy.
Control
TTL/CMOS compatible pulse input is on front-panel BNC connector with 10 kΩ input
impedance.
A logical ‘1’ (3.5 V to 5 V) turns the carrier on, a logical ‘0’ (0 V to 1 V) turns the carrier
off. Maximum safe input is ±15 V.
ON/OFF ratio Better than 45 dB below 1.2 GHz.
Better than 40 dB above 1.2 GHz.
Rise and fall time
Less than 10 µs.