Description
Model 75P-135 is a 75 Ohm relay programmable attenuator with attenuation range 0 to 25.5dB by 0.1dB steps. It operates DC-1000 MHz and is rated for 0.5 Watts of RF input power. This step attenuator is available with 75 Ohm BNC, F, N or TNC coaxial RF connectors. The attenuator has eight individually controlled steps: 0.1dB, 0.2dB, 0.4dB, 0.8dB, 1.6dB, 3.2dB, 6.4dB and 12.8dB.
TTL Controlled
Each of the attenuation steps has a corresponding TTL control line. There are eight TTL control lines for this model. See the outline drawing for the control pinout. TTL high will turn on an attenuation step. TTL low will turn off an attenuation step. Use multiple control lines simultaneously to set combinational attenuation values. To activate the 0.7dB setting, the 0.1dB/0.2dB/0.4dB control lines must all be TTL high. To activate the 2.4dB setting, the 0.8dB/1.6dB control lines must be TTL high. To set the attenuator to the insertion loss state (i.e. 0dB setting), all control lines must be set to TTL low.
