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This is a Tektronix Microwave Comb Generator, that occupies one slot in a TM500 frame. The unit is fitted with a SMA output.
The comb generator is commonly used as an accessory to the 2790 series of spectrum analyzers.
The Type 067-0885-00 Microwave Comb Generator is a calibration fixture for microwave spectrum alnalyzers. It consists of a signal source, a coaxial cable, 3 dB attenator, and a comb generator module. The signal source is powered by a TM500 series power module. The output of the signal source is applied to the comb generator module via the coaxial cable. The 500 MHz signal source can be frequency or pulse-modulated externally. When the output of the signal source is applied to the comb generator, a omb line (spectrum) of markers is generated, which are harmonics of the fundamental 500 MHz. The crystal controlled source provides an accurate reference to chack frequency readout accuracies up to 20 GHz.