The SD Model 6053/3 is a portable, half-rack, microwave counter capable of automatically measuring signal frequencies ranging from 20Hz to 3GHz. Extensive use of integrated circuits and other solid-state components ensures excellent reliability and trouble free maintenance. The Model 6053/3 microwave counter provides the following operating features: 1. An easily read storage-type display which permits the initial reading to be observed while another is being made. 2. Direct reading of frequency with no front panel adjustment necessary. 30 Automatic units of measure and decimal point location. 4. Completely remote programmable! programming inputs for all front panel controls and attenuator switch (optional). 5. BCD recorder output (optional). 6. Unit can be operated on either 115V or 230V ac line. 1o2 FUNCTIONAL DESCRIPTION The Model 6053/3 features the Automatic Computing Transfer Oscillator (ACTO ) technique in conjunction with a new high-sensitivity, high input impedance . 2GHz amplifier to offer unparalleled performance. The basic seven-digit instrument receives its input on one of two input connectors„ 1. BNC - This 20Hz to .2GHz input channel features lOmV rms sensitivity and one megohm impedance. Input signals may be attenuated by factors from 1 to 1000, in decade steps. 2. "N" type connector - Frequencies from ~2GHz to 3GHz can be measured with sensitivities of 50mV rms into 50 ohms.