Skydel Releases New CDM-5 Clock Distribution Module - Inside GNSS - Global Navigation Satellite Systems Engineering, Policy, and Design

Skydel Releases New CDM-5 Clock Distribution Module

Skydel’s new CDM-5 clock distribution module is a PCIe card that provides 10MHz and 1PPS signals for up to five devices that need tight and precise synchronization. The clock distribution module is said to be ideal for PCIe-based Software-Defined Radios (SDR) installed in rackmountor desktop PCs, and can also be used for any other applications that require a precise PC-based timing reference.

Key features include:

  • Timing and frequency source with 5-way distribution of 10MHz and 1PPS 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

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 10MHz and 1PPS, which are then re-distributed via five matched-length traces. Split signals are amplified to maintain the power level across all distributed paths.

Additionally, CDM-5 will regenerate 1PPS from an external 10MHz-only source if a 1PPS source is not available. The module can be integrated into a custom assembly simply 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.