a) Connect the equipment as illustrated. Trigger the oscilloscope on the trailing edge of the PTT signal and adjust it to capture the recovered signal from the test receiver.b) Adjust the transmitter per the manufacturer's procedure for full rated system deviation.c) Set the test receiver to measure peak positive deviation with de-emphasis off.Set the audio bandwidth for ≤0.25 Hz to ≥15,000 Hz and pretune the instrument to the transmitter frequency.d) Set the oscilloscope to capture the last 250 milliseconds of the transmitted modulation and measure the period of the CTCSS reverse burst or the CDCSS turn off code.e) The value recorded in step d) is the transmitter squelch tail elimination burst.