Then a signal producing an 0.60 ma deflection on the coding rééorder is introduced and R-36 adjusted until the receiving recorder reads 0.80 ma. The signal producing 0.20 ma is injected again and R-38 | readjusted to bring the receiving station to the .20 ma reading. Then the 0.80 signal is injected and R-36 adjusted to bring the receiving recorder to the proper level. This process is repeated until the Receiving Station recorder indicates the correct reading when the voltages are alternated. A linearity oheck is then made by. introducing signals of various amplitudes from 0 to 1 volt on the bridge oirouit. The coding and receiving station recorders should agree within 5% of full soale. . 4.1 TBLEPULSE RECEIVING STATION General Description The Receiving Station telepulse unit (Fig. 17) decodes the information transmitted from the aircraft and records a signal, proportional to the radiation intensity at ground level on a strip chart recorder. ‘The number of pulses in each pulse train transmitted from the remote station are eounted and converted to a signal suitable for driving the recorder. The unit operates on 110 wolt 60 cycle power. 4.2 Cirowit Description Several sections of the telepulse receiving station circuit (Fig. 18) are used in a telephone telemetering systen, which obtains data from fixed ground-monitoring stations. These will be described first to separate them from the cirouit operation in the aerial systen. - 38 =