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34970A Refresh UG.book Page 313 Wednesday, February 17, 2010 12:34 PM Chapter 7 Tutorial RF Signal Multiplexing Sources of Error in RF Switching Impedance mismatching can cause a variety of errors in an RF multiplexing system. These errors can cause distorted waveforms, overvoltage, or undervoltage conditions. To minimize RF impedance mismatching: • Use the correct cable and connector for the circuit impedance (50 or 75). Note that it is difficult to visually differentiate a 50 connector 4 from a 75 connector. • Be sure that all leads and signal paths are properly terminated. Unterminated sections of line can appear as near shorts at RF frequencies. Note that the 34905A and 34906A do not automatically terminate open channels. Insertion Loss (50) Insertion Loss (75) Direct to Module Using provided adapter cables VSWR (50) VSWR (75) 7 313
