Signal / Function Generators inc GPS Frequency Reference

Precision Test Systems manufacturers various signal generators.  We can also supply other manufacturers or used signal generators.  Our main signal generators are listed below.

• FSG Handheld, portable signal generators

• SG1640 0 - 1.64 GHz Signal Generator with GPS reference

• G5100A Function Generator

FSG Handheld, portable signal generators

The FSG series of portable signal generators are small handheld units.  Each unit generates a synthesized CW signal over a 100 MHz bandwidth.  For example the FSG500 operates over the 400 to 500 MHz frequency band.  The FSG900 operates over the 800 to 900 MHz band.

The output can be setting in 12.5 kHz to 100 kHz steps (depending upon the model) and the output is typically accurate to 1 ppm.

The FSG2170 is a special unit operating from 1710 MHz to 2170 MHz.

All these models are suitable for propagation testing in the field, or any application that needs a portable signal generator.

All models have internal rechargeable batteries giving up to five hours continuous coverage.  An AC wall adapter is also supplied allowing continuous use or charging of the batteries.

Below is a list of the models.  Click on any title for more information.

SG1640 Signal Generator

Key Features

• 10 µHz to 1640 MHz continuous coverage
• Frequency Steps: 10 µHz
• Internal GPS Synchronized Frequency Standard with UTC aligned 1 pps output
• Frequency Accuracy better  than  1 x 10^-10

• -40 dBm to +10 dBm 50 Ω RF Output (2-1640 MHz)
• DC to 398 MHz,  3.3 / 5V CMOS Outputs
• 10 MHz to 1.6 GHz LVDS Output
• Low Phase Noise and low spurious outputs
• RS232 Interface
• Frequency either CW or frequency sweep
• Broadband Mixer Included

General Description

The SG1640 is a 10 µHz to 1640 MHz signal generator with outstanding frequency accuracy.  The SG1640 has a built in GPS Disciplined frequency standard as its main frequency reference.  Frequency coverage is in three bands; DC to 400 MHz, 400 to 800 MHz and 800 to 1640 MHz.  The frequency can be set with 10 µHz frequency resolution.  Frequency accuracy, when locked to a GPS satellite signal, is typically 1 x 10E^-10 short term and better than 1 x 10^-12 long term.   Thus the SG1640 never requires calibration as it is locked to the GPS satellite service.

Outputs

There are multiple outputs.  The RF output is a 50 Ω,  2 MHz to 1640 MHz output.  This output can be adjusted in amplitude from +10 dBm to -40 dBm.  Logic outputs include a DC – 398 MHz CMOS output that can be set to either 3V3 or 5V output levels.  Dual LVDS/PECL outputs give > 300 mV p-p output level from 10 MHz to 1640 MHz.

Frequency Standard for Free!

The SG1640 has its own GPS synchronized frequency standard (requires GPS antenna – supplied). This GPS Synchronized timebase is available as a 10 MHz output on the rear panel.  This output can act as a laboratory’s frequency reference since it is locked to the global positioning service’s set of satellites.  Accuracy is 1 x 10^-10 in the short time (< 1 sec) and as good as 1 x 10^-12 in the long term (> 1 week).  This 10 MHz output can be connected to the PTS50 or DA series of distribution amplifiers to synchronize a complete workshop or factory.  Thus all the instruments in an entire factory can be synchronized by the SG1640.

Other Features

The SG1640 also has a general purpose, non-dedicated mixer available via BNC front-panel connectors.  RF and LO inputs are from 4.5 MHz to 2 GHz.  Filtered IF output bandwidth is 4.5 MHz to >350 MHz, with -20dBm RF input and -10 to 5dBm LO input sensitivity.  The conversion gain is 0 to -3.5 dBm conversion gain with +14  dBm damage level.

Front Panel Control and Serial Communication

The unit can be controlled via front panel keys with readout on a 20 x 4 character LCD display.  The unit can also be controlled by a RS232 interface (USB optional).  The internal GPS receiver also has its own RS232 interface allowing monitoring of all its settings and functions, such as the number of satellites tracked, etc.

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