Spectrum Instruments TM-4 Intelligent Reference Time & Frequency System

Spectrum Instruments TM-4 Intelligent Reference Time & Frequency System

Condition:
* New surplus stock, in sealed OEM packaging. As pictured.

Additional Notes:
* High spectral-purity 10 MHz sine wave output.
* MTIE Stratum-1 compliance with frequency accuracy of 1x10-12 (long-term).
* Standard one pulse-per-second (1 PPS) output with separate Spectrum ASCII Serial Time Message.
* Sawtooth-corrected timing accuracy of ±5 ns.
* User-selectable PPS source and output mode
* GPS-disciplined ovenized oscillator with very low phase noise.
* Unit-to-Unit Phase Coherency optimization.
* State-of-the-art 12 channel GPS technology.
* Spectrum's exclusive FastStart technology offers high accuracy within just minutes of start-up.
* Intelligent Holdover function provides near-Rubidium stability during GPS unavailability.
* Static and dynamic timing modes.
* Auto Survey position averaging mode.
* Timing information derived from all satellites tracked with only one satellite required in Static Timing Mode.
* RS-232 control interface for control by a host computer.
* Alternative oscillator choices available to meet unique application requirements, including low-cost VCXO, low-power OCXO, and ìRubidium Rivalî DOCXO.
* Two multiplexer outputs. Mux output 1 supplies one of six selectable TTL outputs slaved to the primary frequency reference: 1, 10, and 100 kHz, and 1, 5, and 10 MHz. In addition, Mux1 can also supply a TTL level PPS output or optionally be configured to supply baseband IRIG time code. Mux output 2 can supply 10 MHz or PPS at TTL levels, mirror Mux1ís output, or may optionally supply baseband IRIG or a custom
output.
* NMEA 0183-format message capability (subset).
* Optional very wide range frequency synthesizer output slaved to primary reference. Consult factory for
specific application.
* Optional second sine wave output, either identical to or independent of primary frequency, up to 200 MHz.
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* Optional auxiliary frequency output such as 1.544 MHz or 2.048 MHz slaved to the primary frequency reference. Virtually any common frequency may be chosen.
* Optional synthesized timing pulse output coherent with 10 MHz output and synchronized to 1 PPS. This may be virtually any frequency up to 100 kHz, including frequencies such as 216 2/3 Hz.
* Event Time-Tag (ETT) time stamp with 100 ns resolution.
* Programmed Output Pulse (POP) with selectable pulsewidth and polarity. One-Shot and Repeat Modes.
* Optional Type 11 Network Time Protocol (NTP) output.
* Optional IRIG B (or other time code) serial time code output (TTL and modulated). IRIG G and other IRIG formats also available.
* WindowsÆ-based Control/Display software.
* Front panel indicators for power status, reference ready, and alarm status.
* 9 to 35 VDC operation with rechargeable lithium battery back-up for GPS data.

Spectrum Instruments
TM-4
20020-001