Most of the styles 1 - 10 are windup clocks, but some electric clocks were made in styles 5, 7, and 8.

Pay attention to the shape of the case and not the color (your clock might have a different case or dial color). To identify a Big Ben or Baby Ben, find out which case style it matches. The most important is that the GPGGA and GPRMC message output once per second.The pictures below show the 10 'mainstream' case styles ofīig and Baby Bens and when they were made. The minimum NMEA sentence requirements matter.

Supports Windows 7, 8, 8.1 and Windows 10.

The Big Ben Time Server will use digital filtering (the red line you see in the Time Difference Plot - see below) and discipline the PC clock to this reference. As you would expect, there are delays between the 1PPS epoch and the RS-232 causing software jitter. The Big Ben Time Server will use the NMEA string (GPGGA) transmitted from the GPS, time tag the first character of the that command and use this as a timing reference.

In the USB world, it’s referred as a CDC (communication device class) device. However, the modern USB GPS looks to the PC as a USB to Serial driver that emulates the serial port. The majority of the USB GPS receivers will look to the PC as if it is a serial port. It’s getting more difficult to find a PC with a native RS-232 serial communication port, most GPS receivers that interface to a PC use a USB. Specifically, the rate output of NMEA message GPGGA and GPRMC. By charactering the arrival of NMEA messages, The Big Ben Time Server uses advanced digital filters to minimize communication jitter and achieve the best reference to train the PC clock to.īecause of this, there are some requirements that need to be met. The control loop uses the same techniques in disciplining OCXO oscillators and atomic Rubidium clocks.

The Big Ben Time Server is set up as a system service where the PC clock is disciplined to the NMEA string from the GPS. The Big Ben Time Server is PC time synchronization software that synchronizes the PC clock to the time from a GPS receiver. Big Ben Classic and Big Ben Pro v3 on sale.

Download big ben clocks for sale