The 33000 series Absorptive Modulators combine 33600 coaxial switching modules, quadrature hybrid couplers, and internal loads to form non-reflective control elements. When the unit i s biased to attenuate some or a l l of the input signal, this unwanted power i s absorbed in one of the internal loads, rather than reflected t o the source. The modulators are available in six versions, covering three frequency ranges (1-4 GHz, 3.7-8 GHz, and 8-18 GHz) and two attenuation ranges (40 and 80 dB). The 33602A modules are used in the 40 dB version, the 33604A in the 80 dB version; and the characteristics of the modules are reproduced in the modulators. Video blocking filters and bias networks are integrated into the modulator.