Model DA64-63B from Narda Microwave-East is a switched bit attenuator with 50-percent TTL to 90-percent RF switching speed of 30 ns. It features rise and fall times of 10 ns. The attenuator controls an attenuation range of 0 to 63 dB in 1-dB (monotonic) steps over a frequency range of 2 to 6 GHz with insertion loss of 4.3 dB or less and better than 2.0:1 VSWR. The attenuation flatness is +/-0.5 dB for attenuation settings to 31 dB and +/-1 dB for attenuation settings to 63 dB. The attenuator can handle input power levels to +23 dBm. It requires 350 mA current from a +5-VDC supply and measures just 1 x 0.75 x 0.24 in. The rugged hermetic attenuator meets MIL-STD-202F requirements for humidity, shock, altitude, vibration, and thermal shock and is supplied with removable SMA female connectors.