Monthly Archives: June 2015

Decoding the signal The specification for the NPL time signal (previously Rugby Time signal) is described at http://www.npl.co.uk/science-technology/time-frequency/products-and-services/time/msf-radio-time-signal with each second of transmission encoding two bits (A&B) except for the minute marker which encodes zero bits but instead marks the epoch. Time information … Continue reading →

Comparing samples from clean and noisy environment I have a highly accurate time source in the form of a Motorola VP Oncore GPS which emits a short pulse every second which is within microseconds of UTC and hence can use … Continue reading →

Comparing signals from two receivers I have two receivers so thought it would be interesting to put one in a good reception position, approx 2 metres away from any electrical equipment, and another on my lab desk and compare the … Continue reading →

At the start of every minute Each  minute starts with a minute marker comprising 500mS carrier off and 500mS carrier on with the details of this minute having been encoded in the 58 (negative leap second), 59 (normal), or 60 … Continue reading →

Looking at the MSF received signals… Having established a receiver away from the computer equipment that was causing all my noise issues it was time to investigate the signals so wired up the trusty Rigol oscilloscope and see what we … Continue reading →

I have been far too busy recently with real work to be able to dabble in any hardware design but there has been a project that has been nagging away at the back of my brain for many decades and … Continue reading →