Dear all, So far I have described mostly the power side of things. I thought I would cover more of the GNSS side of things, as I think there might be interest in that. Besides continuous operation, measuring the clock is an important part of the mission. This has it's own set of challenges. The normal way of operating for ORB is to use common view, and in particular the PPP tool of Pascale Defraigne, which is one of the most distringuished experts in the field. She has been a great supporter for this. So, already from my home outside Stockholm Sweden, I had prepared to operate my Septentrio Mosaic-T. However, I did not have time to mount an antenna on the roof of my car, so that only happend at my summerhouse 600 km and 4 degrees south. On the car I mounted a Leica AT504 choke ring antenna with a radome. I was a bit worried about the mounting holding up for the trip, by now 4300 km later and at speeds up to 167 km/h, it just sits there untouched. Since I was not used to the Mosaic-T, I was unable to figure out how to enable logging, so Bruno had to do that for me later. A particular problem I had is that the RxTools software run on Windows and Linux, and naturally I only got my Mac with me and I did not get it to run under Wine. I managed to do a few things using the web-page and commands in command window. Ah well. I knew that Bruno would bring a Septentrio PolaRx4TR, so I had installed a GPS Source antenna-splitter. I brought two Leica antennas, one for which the radome was not mounted. Futher I had brought a Sokkan SK702 pin-wheel antenna. A varity of cables and adaptors was also brought. Turns out that this was needed. As we transfered car in Saint Veran village, I realized that it would be too much work to transfer the antenna on my roof, but since I had the same antenna as spare we used that. Similarly, the pin-wheel was better adapted to record the climb from Saint-Veran village to the Observatoir de Saint Veran. That I had a suitable cable available resolved that problem. Bruno held the pin-wheel antenna out the window, doing his best Hamlet "To be or not to be" interpretation, but without the text. As we did the climb, we where honoured to see plenty of marmots. They are very unafraid, so they move away a few meters. As we climbed up to the observatory, we transfered the clock. Then we took the other choke ring and placed on the roof. The room suggested for us was ideal, as there where pre-existing holes in the wall for cables. Bruno had brought a new temperature stable version of the LMR-400, and we had to extend it just a little to reach from the ideal antenna location over to the clock assembly. Using vulcanizing tape and black isolation tape, I secured the connectors. We only had a little rain. There can be quite a bit of wind, but we saw no trace of the antenna movement, and I had made only a poor attempt at securing the antenna, but it turns out the efforts done was sufficient this time. For next time I will improve on that. On our way down, we just did the same thing in reversal, with the exception that we moved the clock over to the observatory van the evening before, just to avoid stress in the morning. We kept the choke ring and just dropped the antenna cable down so it would be reconnected in the van, along with "house power". That location exposed it to more temperature variations, which is a risk, but that risk is much lower than the risk of stressing the other things. So, both the recievers was getting GNSS signals. The primary goal was to have them running redundantly in parallel and log onto their internal disks. This keeps their dependence to external things to a minimum. Both receivers god a 10 MHz reference from the cesium. An auxillary PPS also provided. This should be enough to measure the frequency of the cesium throughout the experience. We got early results, showing the 1 ms steps I talked about. Resetting the PPS on the cesium resolved that issue, and does not change the frequency of the 10 MHz, as also explicitly stated in the manual. A curious thing is that my Mosaic-T lost the ability to provide PNT solution, yet being able to log track all signals as normal. I have yet to resolve that, but we concluded it could log things and we can post-process the data. In addition I pulled the PPS out of the PolaRx4TR to a TADR TICC, also fed a 10 MHz from the cesium to the TICC. I had intended to time-stamp both the PPS from receiver and clock, but my TICC did not time-stamp many of the PPS pulses from the cesium ever, and none while on the mountain. Because of power failure issues, I pulled the TICCs out in Grenoble and re-installed later in Saint Veran, but the output was not useful, essentially looking at delay noise and such a small slope that no real frequency can be given. I have therefore chosen to ignore the data. I will see if I god more data as we decended. Because we failed to get a good clock charcterization before going up, we do that now afterwards. The cesium now sits in the wellcontroled environment on ORB and receives signal from their antenna in parallel with their clock system. We want a long reference trace to draw conclusions. Also, key personal is on holliday. This is why you do not get any nice plots right now. I had intended to have the TICC trace fill that purpose as a preliminary analyis. It would have even cooler to do realtime display, but I simply did not have the time. I should add that the TADR TICC has phenomenal performance per W power. This is very relevant for setups like these. Data is recorded. Data will be analyzed. More lessons to be learned. We learned immensly about how difficult it is to do this. I could forsee many obsticles, but not all. Once home, I aim to setup my time-lab properly, and to be honest, part of this setup is more or less what I need to setup in the lab. Cheers, Magnus