What is the AM IRIG-B Ratio and the high and low voltage levels? Alex Lippitt August 03, 2020 04:25 Updated High voltage Level: 8.32Vp-p Low Voltage Level 2.56Vp-p Ratio 3.25V As measured on a TCG 01-G with no load connected. Related articles Can the NTS and TCG synchronise to an IRIG-B input signal? Available Syslog Notification Messages on Tekron Clocks How to calculate the maximum number of IEDs that an AM IRIG-B output can support