We had to wait long enough for some RF filters. Half a hour after receiving them, the Maxim MAX2769 which is fitted on our NSL USB dongle tuned correctly on Glonass frequency. I had to quickly make up a bit of Matlab code, and off I went acquiring Russian birds over Nottingham skies.
Result: 8 satellites. Pictures attached.
Fig. 1: The signal characteristics show some interference peak, and the gain should to be increased a bit.
Some details of the channels:
I hope the MAX2769 has no secrets any more :)
The next post will be something new, about a new exciting Software Defined Radio GNSS receiver!