Skydel releases precise clock for GNSS systems

September 6, 2018  - By
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Skydel has released a new clock distribution module for the GNSS industry.

Photo: Skydel

Photo: Skydel

Designed in a PCIe card format, the CDM-5 is a compact and precise clock intended for use with GNSS and other RF systems. It can synchronize up to five devices and can be integrated into custom hardware systems.

Skydel’s CDM-5 provides 10-MHz and 1-PPS signals for up to five devices that need tight and precise synchronization. It is suitable for PCIe-based software-defined radios (SDR) installed in rackmount or desktop PCs, and also can be used for any other applications that require a precise PC-based timing reference.

Skydel’s CDM-5 clock distribution module features two operating modes—internal or external— that are selected with the bracket-mounted switch.

In internal mode, the CMD-5’s internal clock signal is extracted from the onboard high-grade oven-controlled crystal oscillator (OCXO).

When operating in external mode, CDM-5 accepts input signals in the form of 10-MHz and 1-PPS, which are then redistributed via five matched-length traces. Split signals are amplified to maintain the power level across all distributed paths.

Additionally, CDM-5 will regenerate 1 PPS from an external 10-MHz-only source if a 1-PPS source is not available.

The CDM-5 can be integrated into a custom assembly by removing the bracket plate and powering the board through its 12V DC connector. When the bracket is removed, the operating mode can be toggled using the onboard switch.

Key features:

  • Timing and frequency source with five-way distribution of 10-MHz and 1-PPS signals
  • PCIe form factor for rackmount or desktop PC
  • Two operating modes: internal clock (OCXO) or external clock (10MHz and 1PPS)
  • Supports standalone operation with 12V DC power supply

About the Author:


Tracy Cozzens has served as managing editor of GPS World magazine since 2006, and also is editor of GPS World’s sister website, Geospatial Solutions. She has worked in government, for non-profits, and in corporate communications, editing a variety of publications for audiences ranging from federal government contractors to teachers.

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