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TimeMachines®, Inc.

3-Channel Distribution Amplifier

January 21, 2026
tm2503B 10MHz amplifier

The 3-channel distribution amplifier is now available for purchase!

The TM2503B is a 3-channel distribution amplifier that can distribute 1PPS and 10MHz signals from other TimeMachines® time server products. It is well matched to the TM2500C when needing to distribute the 10MHz signal to distant equipment. It resides in the same form factor as the TM2500C and can be mounted in the same rack mount panels making for a clean installation.

The TM2503B contains filtering to turn the 3.3V square wave 10MHz signal into a low distortion sine
wave. 50Ohm outputs are standard. Clean sine waves travel much more reliably on coaxial cable
across longer distances. The 1PPS signal is not filtered, but having 3 separate drivers allows a wider
distribution of the 1PPS signal if required. The TM2503B has a selection switch that switches the
signal path between the 1PPS and 10MHz modes. It is powered from a single 12V supply and provides
isolated outputs. Front panel LED indications for 10MHz and 1PPS modes, as well as a power LED provide functional information with a quick glance. Input and output connections are made through standard BNC connectors located on the back of the device.

New Features:
Improved 1PPS drive outputs and reduced delay, now 33nS.
Improved output drivers for 10MHz sine waves, wider input signal range.

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