DAMPS (IS-54) and DCCH (IS-136) mobile phone test adapter ?/4 DQPSK signal generator ?/4 DQPSK analyzer Bit Error Rate (BER) meter Adjacent/alternate channel power measurements The 83206A TDMA Cellular Adapter adds TDMA DAMPS/DCCH (IS-136) mobile measurement capability to the Keysight 8920B RF Communications Test Set. The 83206A TDMA Cellular Adapter (8920B-800) provides a complete ?/4 DQPSK signal generator, ?/4 DQPSK modulation analyzer, data source, and BER analyzer for TDMA measurements on DAMPS (IS-54) and DCCH (IS-136) phones. The 83206A replaces the 83201B TDMA cellular adapter (8920B-500) for making measurements on TDMA dual-mode DAMPS phones, adding digital control channel test features to fully characterize DCCH phones.