Oops.. the Res-T emulates a 12 channel Motorola receiver (with a few differences), not an 8-channel. One big difference is that you cannot stop a self-survey when in Motorola mode. Also, I have seen it occasionally report that is in survey mode when it is not (could be related to the stopping a survey issue). The TEP reports satellite tracking status is either TRACKING or SEARCHING... real Motorola 12-channel receivers have eight possible tracking states. The TEP always reports the satellite fractional clock offset as 0 whereas the Motorola reports a value from 0 to 1E9 nanoseconds (or 2^31 nanoseconds in some of the tracking modes). There are probably other minor differences... Also, if you switch a TEP to TSIP mode but do not send the command to update EEPROM, a power cycle with get you back to Motorola mode... and a survey.