A diverse family of reference products from the low cost TCXO to low noise atomic references disciplined to GNSS. 10 MHz to 100 MHz locked references. Modular references that can operate from -60 to +60 Vdc in remote towers to rack mount atomic multi-channel references offering high stability, low noise and reliability as well as SNMP for remote monitoring and control. Reverse polarity protection, transient and fault protection and conservative design practices enable a product that will provide years of service. Kits availble that include antenna, cables and power supply.