The NorCal 40B is a compact and efficient 40-meter CW transceiver. No other QRP transceiver offers its combination of extremely low current drain, high performance, reliability, and ease of assembly. These and other features have led many operators to choose the NorCal 40 radios, both for home station and lightweight field use. Originally a project of the Northern California QRP Club, the NorCal 40B and its predecessors, the NorCal 40 and 40A have been field-tested by thousands of QRP enthusiasts world-wide. With the NorCal 40B, the classic design has been further revised, making it easier than ever to build and operate. We’ve retained an essential ingredient that has made this rig so successful: the flexibility to adapt the’40B to your own needs. There’s plenty of extra front- and rear-panel and interior space. Numeric values given are typical; your results will be somewhat different. All measurements were made with a 13.8V supply and 50? Load at the antenna. 1.3″ (H) x 4.6″ (W) x 4.5 (D). 2.1 x 5.5mm coaxial plug, center positive. 10 to 16 VDC; reverse-polarity protection. 15 to 20 mA. 400 mA – 500 mA at 3.0 watts output. 2.085 MHz nominal. Any 40 to 45 kHz segment of the 40m CW. Band (7.0-7.15MHz). 100Hz total from cold start at 65°F. 1.0 to 3.0 W. 1.5:1 SWR, brief operation into high SWR. No PA damage when transmitting into open. Better than 0.2uV for 10dB S+N/N. 4.915MHz, 4-pole Cohn crystal filter. +/- 2kHz at center of VFO tuning range. 8? Or higher (headphones or speaker). (3.5mm headphone plug required – see Operation).