GPSTM Nortel Trimble hack.

Background of the GPSTM Conversion

I have several Symmetricom time references all of which are large.  I really needed something compact for my newest bench area. I fumbled upon a Nortel card (GPSTM). It is basically a Trimble Thunderbolt. It has a few minor differences, utilizing the same software for configuration. It has a 10mhz output (SMB Connectors). I used a Symmetricom Distribution Amp to sync all my equipment on the bench (Signal Gen, HP 8935 Spectrum Analyzer, HP Frequency Counter). The only modification required is a 48V(24-48VDC) DC power supply. It is very straightforward to get one of these up and running as a repurposed GPSDO. It is small, compact, and won’t break the bank. I completed this project for well under $200.  A photo of the DC connection is below and a video as well.

Video

Power Supply Modification

Nortel GPSTM Hack DC connection.
Nortel GPSTM DC Connection point.

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