After replacing the GPS-Antenna, The unit reports the whole sky full of satellites, most of them with good S/N values. The unit does not reset itself anymore. Furthermore, after some time, the display indicates "Frequency Lock" - But it is a false indication. It is nowhere near. The DAC output value starts at a low value, where the OCXO is 1 or 2 Hz below 10,000,000 Hz. Then slowly rises till it rushes all way up to 99,9% which is +2 Hz above 10,000,000 where it stays. No indication of the unit ever trying to correct this latch-up situation. Even in this state, the Front panel LED indicates that the unit is operating normally. There are no alarms, No error flags. Not having a service manual and no information about the GAIN-setting parameter, I have decided to spend no more time with it for now. Ulf Kylenfall