On 420 MHz 2 local beacons who GPS driven for mobitex, let it run for day, no drift.
Tetra also GPS driven beacons, no drift. Will put rf signal source on it, later to run for day see what bring.
Not buy or use this type receiver for HF, on HF use MB-1 of FLEX
Can somebody repeat above experiments with old unit running latest SW? If the drift is observed on such unit under similar conditions then that would be the final proof that problem was fixed on HW side (I doubt).