|IFR 2026 Generator|
Introduction The 2026 is a multisource signal generator offering as standard two signal sources in one instrument. Up to three sources may be fitted, each of which is a fully functional modulated signal generator. Each source can either be routed to its own individual RF output or switched to the input of an RF combiner network before being fed to a separate combined RF output. All sources cover the frequency range 10 kHz to 2.4 GHz. An additional RF input is provided to enable the output from an external RF signal generator to be combined with the signals from up to two internal sources. Each signal source can be controlled independently in frequency and level, and each has its own amplitude, frequency, phase, FSK and pulse modulation capability. All parameters can be entered from the front-panel keyboard and a rotary control can be used to adjust most settings. The instrument includes a GPIB interface which allows remote control of all standard signal generator functions except the supply switch. The instrument is provided with built-in tests specifically for use with two or three combined sources such as for amplifier and receiver intermodulation tests and receiver selectivity tests. The sources may be locked together, offset in frequency (additionally with a harmonic or sub-harmonic relationship) as well as level. Microprocessor control ensures that the instrument is flexible and easy to use and allows programming by the General Purpose Interface Bus (GPIB) or RS-232 serial bus. The GPIB is designed to IEEE Standard 488.2 and is a means of sending commands to an instrument, via a data bus. from a remote controller or personal computer. The instrument can therefore be used manually or as part of a fully automated test system. GENERAL INFORMATION 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 [O']['fr] 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 and brightness may be varied to accommodate differing lighting conditions and the setting saved in memory. Frequency selection Carrier frequency is either selected directly via the keyboard or remotely via the interfaces. Frequency resolution is 1 Hz across the complete frequency range of 10 kHz to 2.4 GHz. A series of carrier frequencies can be stored in non-volatile memory for recall when required. Output Peak RF output levels from each signal source of up to -1-24 dBm can be set up to 1.2 GHz (+20 dBm up to 2.4 GHz) by direct keyboard entry with a resolution of 0.1 dB down to -137 dBm. The peak output level from the combiner is +4 dBm up to 1.2 GHz (0 dBm up to 2.4 GHz). RF ON/OFF keys are provided to disable each individual output as well as the combined output. A choice of level units is available to the user and provision is made for the conversion of units (for example, dBm to μν) by a simple keypress. An electronic trip protects each independent signal source output against reverse power of up to 50 W. This prevents damage to output circuits when RF transmitter or DC power supply is accidentally applied to an 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. Modulation Comprehensive amplitude, frequency and phase modulations are available. Pulse modulation can be applied to the carrier from an external pulse source. The instrument also produces FSK modulated outputs. An internal modulation oscillator is provided, having a frequency range of 0.01 Hz to 20 kHz. Sine, triangle and square waveforms are available. The oscillator is capable of generating one or two modulation tones simultaneously in one modulation channel. A BNC connector on the front panel offers access to the internal LF signal as well as providing an input for external modulation signals to be combined with the internal signals. These sources can be combined to give a number of modulation modes. The pulse modulation can be used in combination with the other forms of modulation. The frequency modulation range provides a 1 dB bandwidth of typically 100 kHz and provides FM deviation of 0 to 100 kHz. AC or DC coupled FM can be selected. Phase modulation is provided with a 3 dB bandwidth of 10 kHz and deviation range of 0 to 10 radians. Amplitude modulation with a 1 dB bandwidth of typically 30 kHz and with modulation depths of up to 99.9% is available with a resolution of 0.1%. Pulse modulation is available as standard with typical rise and fall times of less than 10 μβ and 40 dB on/off ratio. The instrument also accepts one or two logic level inputs to produce a 2-level or 4-level FSK modulated output. The required FM deviation is set by keyboard entry. The external input voltage required for specified modulation is 1 V RMS (1.414 V peak). To accommodate other signal levels, Automatic Level Control (ALC) can be selected which provides correctly calibrated modulation for inputs between 0.75 and 1.25 V RMS. A modulation ON/OFF soft key simplifies the testing of signal-to noise-ratio.
These manuals are available for the above equipment:
|IFR -- 2026 -- User Manual|
|Manual Type||User Manual|
|Size||8.61 Mbytes (9028211 Bytes)|
|Date||27 September 2000|
|Quality||Scanned document, all readable.|
|Upload date||24 May 2015|
|Downloads||154 since 24 May 2015|
This manual applies to instruments with software issues of 10.00 and higher. This manual explains how to use the 2026 Multisource Generator. Intended audience Persons who have a need for accurately generated signals in the VHF and UHF spectrum. It is assumed that the reader will be familiar with telecommunication terms used in modem communication systems. Structure Chapter 1 Main features and performance data Chapter 2 Installation details Chapter 3 Local operation Chapter 4 Source configuration, coupling and selected applications Chapter 5 GPIB operation with keywords and sample programs Chapter 6 Brief technical description Chapter 7 Instructions for doing acceptance testing Document conventions The following conventions apply throughout this manual: RF OUTPUT Titles marked on the instrument panel are shown in capital letters. [SET UP] Key titles are as shown on the key-caps in square brackets. /Carrier Freq] Soft key titles are shown in italics in square brackets; for example, /Carrier Freq] means the soft key adjacent to the Carrier Freq title box at the side of the menu. RF Level Messages on the display are shown in italic letters. Associated pubSfcations Other publications covering specific aspects of this equipment are: Maintenance Manual (46882/295) Covers maintenance and repair. Service Manual (46880/094) Consists of operating manual (this document) plus maintenance manual.
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