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The Intelligent Reference/TM-4™ and TM4/OEM™ are multi- purpose, GPS
disciplined timing signal generators and frequency references in economical
off-the-shelf and custom configurations. Intended for use in a wide variety of timing,
synchronization and frequency reference applications, they are based on the
most advanced architecture Spectrum has ever offered, and include the most
popular features of Spectrum's core platform for current timing products. The
TM-4 is incredibly small in size, and yet is capable of achieving remarkable
performance. Incorporating a very high-quality OCXO, the TM-4 provides
Rubidium-like stability while retaining all of the benefits of quartz-based
designs. Our Intelligent Holdover™ technology learns the behavior of the
individual oscillator and uses that knowledge during periods of GPS
unavailability to more precisely control its stability. Our
FastStart™ technology, coupled with a state-of-the-art GPS
receiver can have the TM-4 up and running at very high precision in as little
as five minutes from startup.
The standard configuration has two BNC connectors that deliver the PPS output
and 10 MHz sine wave signals, and a high density 15-pin D-sub connector for all
other inputs and outputs. This makes the TM-4 very easy to integrate.
The Intelligent Reference/TM-4™ is highly customizable and offers a vast
and useful array of both standard and optional features. Standard features
include a high spectral-purity sine wave output, TTL frequency outputs, two
individually programmable multiplexer
outputs, 5ns timing accuracy, Programmed Output Pulse function, Event Time Tag,
1PPS output with separate ASCII serial time message, and included control
software that runs on most Windows-based computers. The standard TM-4 meets
MTIE requirements for a Stratum-1 primary clock source and is also available as
an OEM-style board-only product.
With optional IRIG-B output, the TM-4 and TM-4/OEM can act as highly accurate
time code generators, and are also available with IRIG-G (or other IRIG
variant) and/or NASA-36 modulated and TTL level time code outputs.
New features for 2007 include real-time sawtooth correction of PPS for our best
accuracy ever, user-selectable smoothed (jitterless) PPS and a new architecture
optimized for phase coherency, making it an ideal frequency reference for phase
coherent radio applications such as Time Difference of Arrival and simulcast.
Other options include a 1U rack mount adapter, a 13 MHz OCXO output for GSM and
other applications, Network Time Protocol output and an auxiliary clock output
that is factory set to any common frequency. Another unique optional feature is
the ability to generate a synthesized timing pulse that is coherent with the
primary output and synchronous to PPS. This pulse features ultra low jitter and
can be set to virtually any frequency up to 100 kHz, including unusual values
such as 2162/3 Hz. The addition of an
optional secondary analog output module generates four (two selectable at any
one time) CTCSS (PL) tones for simulcast and squelch control
applications.
Contact us for pricing and more
information about the Intelligent Reference/TM-4™ and
TM-4/OEM™.
TM-4 shown with optional rack-mount
adapter.
Dimensions:4.125"x4"x1.5" • Weight:13 oz • Power:
12-35 VDC, 24V nominal • Supplied accessories: Operation
software
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