The Bird 4314B Wattmeter is similar to the Bird Model 43 Thruline Wattmeter but also contains electronic circuitry to accurately measure peak envelope power which is present in amplitude modulated signals such as AM broadcast, single sideband and TV video transmitters. The circuitry operates from 2 standard 9V alkaline batteries or an optional A.C. adaptor. Specifications: Accuracy: ±5% of full scale CW, ±8 PEP Battery: Two 9-Volt alkaline transistor batteries Connector: QC Type (Female N normally supplied) Finish: Light gray powder coat Frequency Range: 450 kHz to 2.7 GHz (depending on elements) Insertion VSWR: with N connectors 1.05 max. to 1000 MHz Nominal Size: 6 7/8" H x 5 1/8" W x 3 5/8" D (175 x 130 x 92 mm) Power Range: 100 mW to 10 kW using Bird Plug-In Elements Pulse Parameters: (min.) Pulse width 0.4µs (100-2300 MHz), 1.5µs (26-99 MHz) and 15µs (2-25 MHz); repetition rate 30 pps and duty factor 1 x 10^4min. Weight: 3 lbs. (1.4 kg)