GENERAL INFORMATION
1-2
Introduction
2023A, 2023B and 2025 are portable and lightweight synthesized signal generators covering the
frequency range 9 kHz to 1.2 GHz (2023A), 9 kHz to 2.05 GHz (2023B), and 9 kHz to 2.51 GHz
(2025). A dot matrix display with a comprehensive set of utility menus allows flexibility of
operation and ease of use. The RF output can be amplitude, frequency, phase or pulse modulated.
An internal programmable AF source is capable of generating simultaneous two-tone modulation.
All parameters can be entered from a front panel keyboard, and a rotary control can be used to
adjust most settings. Microprocessor control ensures that the instrument is flexible and easy to use
and allows programming by either the General Purpose Interface Bus (GPIB) or by RS-232. The
GPIB is designed to IEEE Standard 488.2. The interfaces allow remote control of all functions
except the supply switch, and allow the instrument to be used either manually or as part of a fully
automated test system.
Main features
Operation
Selection of parameters on the screen may involve one or more of the numeric, hard or menu
selection keys or the rotary control knob. Parameters may be set to specific values by numeric key
entry, while values may be varied in steps of any size using the DOWN/UP keys or altered by
moving the control knob, set to a particular sensitivity.
Display
The display is a dot matrix liquid crystal panel, with backlighting. Display contrast may be varied
to accommodate differing lighting conditions, and the setting saved in memory. A graphical
display test is available to the user.
Frequency selection
Carrier frequency is either selected directly via the keyboard or remotely via the interfaces.
Frequency resolution is 1 Hz across the band. A series of carrier frequencies can be stored in
non-volatile memory for recall when required.
Output
RF output up to +13 dBm can be set by direct keyboard entry with a resolution of 0.1 dB over the
entire range. For instruments fitted with the high power option, RF output is increased to
+25 dBm. A carrier ON/OFF key is provided to completely disable the output.
A choice of level units is available to the user and provision is made for the conversion of units
(for example, dBm to μV) by a simple keypress.
An electronic trip protects the generator output against reverse power of up to 50 W. This prevents
damage to output circuits when RF or DC power is accidentally applied to the RF OUTPUT
connector.
To facilitate testing of receiver squelch systems, an attenuator hold function allows control of the
RF output without introducing RF level drop-outs from the step attenuator.
The RF output level can be offset by up to ±5.0 dB to compensate for cable or switching losses, or
to standardize a group of instruments.
A maximum RF output level can be set, to protect sensitive devices connected to the RF OUTPUT
socket.
Spectral purity
With an SSB phase noise performance of typically −121 dBc/Hz at 20 kHz offset from a 1 GHz
carrier, this instrument can be used for both in-channel and adjacent channel receiver
measurements. Harmonically related signals and non-harmonics are typically better than −25 dBc
and −60 dBc respectively.
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