Microwave Data Systems MDS 4310 Installation, Operation & Field Maintenance page 116

Radio RF TX Power Control
U10 is a 100-position 100k EEPOT that controls the radio's RF TX power. U10 is configured
as a ratiometric resistor that sources a voltage to control the transmitter power. The voltage
being sourced by the EEPOT is controlled by the micro-controller on the transceiver's main
circuit board. The setting is controlled by the firmware through the diagnostics channel, both
locally and remotely.
Radio Center Frequency Control
U9 is a 100-position 100k EEPOT that controls the radio carrier frequency. U9 is configured
as a ratiometric resistor that sources a voltage to control the carrier frequency. The voltage
being sourced by the EEPOT is controlled by the micro-controller on the transceiver's main
PC board. The setting is controlled by the firmware through the diagnostics channel, both
locally and remotely.
D-6 APPENDIX D MDS 05-2415A01, Rev. A