orating wheels and quick disconnect RF, electrical, and plumbing fittings. The assembly shall incorporate a positive wheel locking mechanism to prevent accidental movement while in operation. 7 SPECIFYING EQUIPMENT AND SERVICES Electrical, Electronic Characteristics, and Performance Power Rating-Each transmitter shall be designed for and be capable of operation at the average DTV power specified in the test and acceptance specification. Metering to permit proper maintenance and roubleshooting, including: Collector or Cathode Current Collector or Collector-to-Cathode Voltage Body Current Coolant Temperature Output Power Reflected Power Filament Voltage Filament Current Focus Magnet Current High-Power Amplifier Characteristics And Performance Protection circuitry shall be incorporated to protect the IOT by removing high voltage and drive power from the IOT in the event of an internal tube arc or beam current overload. Any overload condition shall cause the control circuits to remove and automatically reapply high voltage to the amplifier. Three overloads within a short period shall shut down the amplifier and activate the appro- priate overload fault indicators. Over-current protection devices shall comply with all specifications of all tube manufacturers ap- proved for the transmitter to avoid violating the manufacturer's warranty. The protective circuitry shall also protect the IOT from other faults that may cause damage to the tube or the tube's circuitry including but not limited to extreme collector temperature, VSWR, and body or grid currents. Supplier shall describe its method of IOT protection and the means by which its tube protection circuitry complies with each approved tube manufacturer's warranty requirements. PRACTICAL IP AND TELECOM FOR BROADCAST ENGINEERING AND OPERATIONS IPA/Driver The IPA/Driver meeting the following requirements: Modular design and easily serviceable Designed for optimum linearity and fully compliant with ATSC transmission standards Rated for at least 120 percent drive power outp