More radar testing.
Contocte does not effect call out.
Contocte is not range either - it seem to be total power of contact signals from target.
I moved towards target until it read over 200 - then backed off
It continued to go up until I reversed out or range.
Contocte - ramained on radar even when out of range.
Switching radar off on will not reset it
Testing the data\Objects\Sensors\UBoot_Sensors.sim I changed ProbInsideArc = 0.95 to ProbInsideArc = 0
Contact was shown on radar screen but not seen by crew or drawn on map. (TCx1+8)
Changed it to ProbInsideArc = 1
Crew could see target and marked it on map. This happened at long range 6600m (TCx1+8)
Tested again on map view at TCx64 - crew did not find contact
Tested again at TCx32 - crew did find contact

Looks as if the radar is more effective at low TC and anything above 32 (animation limit?) - it will not see the target