Hi Andy,

The project is already working, I just wanted more information displayed on LCD. The LCD board piggybacks the LCD display. It has a 16F818 which deals with the NMEA string and ADC functions.

It's a GPS Disciplined Oscillator producing 10MHz to 10-12 signal. For accuracy of frequency and timing for MS and EME.

It remains extremely stable but I am slightly improving it by logging the PLL control voltage and the TCXO temp swing.
By logging I can get a mean control position for either start up purposes or short term 'dropout' from gps. Thus it will keep accuracy for short term outage. If the unit is turned off then on, I can apply the correct PLL control voltage until the gps locks again. Although watching the PLL voltage swing whilst trying to lock was fascinating.

It also produces a very accurate 1PPS output. I later intend to use this to trigger the NMEA sentence display. You may be aware that the sentence suffers from lag or slight offset depending if the gps module decides to send another, other, information sentence. In my case at the moment it is 1.635 secs BEHIND actual time as my module occasionally sends out the powerID string which puts the timing RMC sentence out.
I will be turning all off except the RMC sentence. At the moment it is testing phase.

I get a very strong signal from the 60kHz time signal from Anthorn in the UK so I can actually compare the second epoch via SpecLab software visually.