For software-specific issues or remote operation, you should refer to the R2600 Programming Reference , which details RS-232 and IEEE 488.2 command sets. Repeater Builder® specific troubleshooting procedure
Your spectrum analyzer marker reads accurate frequency but low power. The manual solution: The RF leveling loop. The manual directs you to test the "Detector Diode" on the A1 board and the "Log Amp" at TP-403. It gives expected DC voltages (e.g., 1.2V at -10 dBm output). You learn it's not a software issue; it's a blown surface-mount resistor in the attenuator path. motorola r2600 service manual