Signal Generators
Important criteria of a Signal Generator are the spectral purity of RF carrier, the modulation capabilities and signaling encoders for applications in radio communications. A fast switching time between two frequencies is also a very important performance feature for RF signal sources. The use of DDS technique (Direct Digital Synthesis) allows ultra-fast and phase continuous frequency switching - the amplitude and phase at both - the old and new frequency - are exactly identical because discret values of the sine wave are stored in a ROM.
SG-1000 Synthesized Signal Generator
Signal Generator SG-1000
The SG 1000 series of synthesized signal generators cover a wide range of carrier frequencies from 9 kHz to 1000 MHz with excellent spectral purity and comprehensive modulation facilities. Two different models of the SG 1000 series are available, an economical version with a switching time of 1 ms (BN 86204.000) between any frequencies and a high performance version with 1 μs / 15 μs (BN 86204.001) high-speed switching. Frequency changes less than 1 MHz are phase-continuous.
The operation of signal generator is made very simple with a softkey menu selection of modes. All instrument settings and signal parameters can be entered by numeric keyboard, rotary control knob and increment-decrement keys. The step size may be varied by the user in a wide range. A backlit high-contrast LCD display presents all measurement setup menus. The SG 1000 signal generator stores up to 100 complete instrument settings in a non-volatile memory. Set up time is reduced by recalling previously stored settings.
The signals generated by the SG 1000 can be amplitude, frequency, phase and pulse modulated for testing all types of receivers. In addition to AM, FM and PhM modulation the SG 1000 also provides pulse modulation which is required for EMI applications. An internal modulation oscillator from 0 to 32 kHz (up to 100 kHz as option) in 0.01 Hz steps, an external signal or both of them can be used for modulation.
The internal LF source generates a variety of waveforms, sine-wave, square-wave, triangle and saw-tooth. The POCSAG signalling encoder (option) allows a one-box solution for pager testing with various modes, tone-only, numeric and alphanumeric. All ASCII characters are generated in the alphanumeric mode.
The high-speed switching version of SG 1000 synthesized signal generator includes a sweep & hopping option. Hopping programs - any kind of frequency sequences or high-speed digital sweeps - are running via a programable and addressable memory bank. Up to 16,384 hopping locations can be loaded with individual frequency data. Loading is possible via front panel operation or from the IEEE-Bus interface. These hopping programs with free selectable start and stop address are running with the internal clock or controlled from an external clock.
The user has direct access to the internal 14 address bus via the 50-pin hopping interface and can select any hopping address by remote control operation. This allows the user to program very complex and fast running frequency sequences required by production testing or in ATE applications. In the sweep mode the user is able to define up to 8192 steps. The step and pen-lift times are selectable in a wide range. The sweep is running in single or auto-continuous mode.
To compensate for the attenuation in connecting cables or other losses, it is possible to add a corresponding correction to the output level.
SG-1000 Synthesized Signal Generator |
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Frequency Synthesizers
Frequency Synthesizers are basically RF signal sources with variable output frequencies which are directly derived and generated from a precise reference frequency (internal or external) with no additional frequency error. The ideal output signal is a single spectrum line with no other unwanted frequencies. This can't be realized in practice and all RF-signals have a so-called spectral purity. This is a combination of harmonics, non-harmonics (discrete spurious), SSB phase noise, noise floor and residual FM.
ND-500D & ND-1000D Frequency Synthesizers
Frequency Synthesizer ND-1000D
The Frequency Synthesizers ND-500D and ND-1000D are the most advanced bench top instruments in the Schomandl frequency synthesizer line. With their technical data and ease of use, these frequency synthesizers are excellently suited to use in research, development, production, and calibration laboratories.
A high contrast LCD display shows all instrument settings which are stored in a non-volatile memory. Data entry to set frequency and output level is done via numeric keyboard, function keys, or rotary control knob. The ND-1000D frequency synthesizer is also available with a programmable output attenuator down to -137 dBm. The high spectral purity of the output signal (SSB-phase noise ≤ -126 dBc/Hz; residual FM ≤ 0.1 Hz) allows usage of the synthesizers as local oscillators in test setups.
ND-500D Frequency Synthesizer |
ND-1000D Frequency Synthesizer |
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ND-500S & ND-1000S Frequency Synthesizers
Frequency Synthesizer ND-500S
The Frequency Synthesizers ND-500S and ND-1000S are bench top instruments with manual control via front panel rotary switches. The controls prevent unintentional changes to the frequency settings. However, the ultra-fast switching of frequency changes less than 1 μs is only possible via BCD parallel control.
The RF-output level on the frequency synthesizers ND-500S and ND-1000S is set using a potentiometer on the front of the instrument. Two LED's on the front panel indicate stand-by mode and temperature status of the OCXO. An interface switch selects the operation modes, IEEE-Bus, RS 232, BCD or local control via rotary switches.
The frequency synthesizers ND-500S and ND-1000S can also be used for all ND-500 and ND-1000 applications.
ND-500S Frequency Synthesizer |
ND-1000S Frequency Synthesizer |
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ND-500 & ND-1000 Frequency Synthesizers
Frequency Synthesizer ND-500
The Frequency Synthesizers ND-500 and ND-1000 are remote-only units in a 19" rack-mount chassis with blank front panels. The ultra-fast switching time of less than 1 μs is only possible via BCD parallel control. Remote control via the optional IEEE-Bus or RS 232 interface delays the total switching time by the run-time of bus commands.
The output level of the ND-500 and ND-1000 frequency synthesizers can be set in a wide range by a potentiometer on the front panel. Two LED's on the front panel indicate stand-by mode and temperature status of the OCXO.
ND-500 Frequency Synthesizer |
ND-1000 Frequency Synthesizer |
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ND-D 500/500 & ND-D 1000/1000 Dual Channel Frequency Synthesizers
Dual Channel Frequency Synthesizer ND-D
The Dual Channel Frequency Synthesizers ND-D 500/500 and ND-D 1000/1000 have been designed specially for applications in ATE and NMR-systems. Two fully independent frequency synthesizers are fitted in a 19" rack-mount chassis. Both frequency synthesizers channels are supplied from a single reference oscillator with superior spectral purity and from a single power supply. This design concept reduces the costs and the size, becoming more space efficient. The technical specifications of each channel are the same as the single channel units ND-500 and ND-1000.
The output level ranges can be set in a wide range from 0 dBm up to +13 dBm by two potentiometers on the front panel. Each channel is controlled through its own 50-pin BCD parallel connector. Two LED's on the front panel indicate stand-by mode and temperature status of the reference oscillator (OCXO).
ND-D 500/500 and 1000/1000 Frequency Synthesizers |
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For orders, quotes, or tech assistance,
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Contact Byron Johnson, byron.johnson@lbagroup.com
Call 800-522-4464 or 252-757-0279
Accepted
LBA Technologies has partnered with industry leading Kathrein-Werke KG of Germany as the exclusive Western Hemisphere distributor for Schomandl Signal Generators and Frequency Synthesizers.
