OPTION 11 FAST PULSE AND HIGH POWER
Annex-B-2
General description
Option 11 increases the maximum output from the normal +13 dBm and adds the ability for the
instrument to internally generate a fast pulse modulated waveform at a high power level from logic
levels applied to the PULSE INPUT socket. The pulse modulator is suitable for generating fast
pulses with high isolation for applications in radar and EMI. It may be used in conjunction with
other forms of modulation to form composite signals. Familiarity with normal operation of the
signal generator is assumed.
The functions of the EXT MOD INPUT and LF OUTPUT sockets for the standard instrument are
combined in the MOD I/O socket. The PULSE INPUT socket replaces the standard rear-panel
PULSE I/P socket. This relabeling should be taken into consideration throughout the manual,
especially in regard to the connections made for Acceptance Testing in Chapter 7.
Performance data
The specification is the same as for the standard instrument with the following exceptions:
RF output
RF output range:
−140 dBm to +25 dBm (output power above +19 dBm is uncalibrated for carrier
frequencies above 1.2 GHz and above +14 dBm above 2.4 GHz).
Maximum output level is reduced by 3 dB when pulse modulation is selected.
RF level accuracy (above
+7 dBm):
Over a temperature range 17°C to 27°C:
±1 dB 9 kHz to 1.2 GHz <23 dBm
±1.5 dB 9 kHz to 1.2 GHz <25 dBm
±2 dB 1.2 GHz to 2.51 GHz.
Temperature coefficient <±0.02 dB/°C 9 kHz to 1.2 GHz, and <±0.03 dB/°C 1.2 GHz to
2.51 GHz.
Harmonics:
Typically better than −25 dBc for levels 6 dB below the maximum specified output.
Pulse modulation
Frequency range: 100 kHz to 2.51 GHz (usable to 9 kHz).
RF level accuracy:
Additional ±0.01 dB/°C temperature coefficient when pulse enabled.
On-off ratio: >80 dBc below 1.2 GHz;
>70 dBc up to 2.05 GHz (typically >80 dBc);
>65 dBc up to 2.51 GHz (typically >70 dBc at 2.51 GHz).
Rise and fall time: Less than 20 ns, typically 10 ns.
Maximum repetition frequency 10 MHz.
Control:
TTL levels into 50 Ω input impedance. An HCT logical ‘1’ (2 to 5 V) turns the carrier on, a
logical ‘0’ (0 to 0.8 V) turns the carrier off. Maximum safe input is ±10 V.
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