. Compendium of meteorology. Meteorology. 1680 MCS RECEIVER PULSE SHAPER 10-190 CPS ERROR VOLTAGE AMPLIFIER 30 CPS METEORO- LOGICAL RECORDER ANGLE RECORDER ELECTRONIC COMMUTATOR AZ ERROR SIGNAL! AZIMUTH SERVO AMPLIFIER EL ERROR SIGNAL AZIMUTH DRIVE MOTOR AND SELSYN ELEVATION SERVO AMPLIFIER ELEVATION DRIVE MOTOR AND SELSYN Fig. 1.—Block diagram of the latest automatic balloon-traclviiig direction finder. strips, each separated by an insulating segment. Every fifth conducting strip is in. wide; all other con- ducting strips are in. wide; while the insulating. Fig. 2.—An automatic b
. Compendium of meteorology. Meteorology. 1680 MCS RECEIVER PULSE SHAPER 10-190 CPS ERROR VOLTAGE AMPLIFIER 30 CPS METEORO- LOGICAL RECORDER ANGLE RECORDER ELECTRONIC COMMUTATOR AZ ERROR SIGNAL! AZIMUTH SERVO AMPLIFIER EL ERROR SIGNAL AZIMUTH DRIVE MOTOR AND SELSYN ELEVATION SERVO AMPLIFIER ELEVATION DRIVE MOTOR AND SELSYN Fig. 1.—Block diagram of the latest automatic balloon-traclviiig direction finder. strips, each separated by an insulating segment. Every fifth conducting strip is in. wide; all other con- ducting strips are in. wide; while the insulating. Fig. 2.—An automatic balloon-tracking direction tinder set up for operation. Rawin Set AN/GMD-1. segments are about in. in width. Each insulating segment is associated -svith a temperature measurement, each 5th and 15th conducting strip is associated with ured after the 104th contact, the remaining conducting strips being used for reference signals. The 150 con- ducting strips are printed on a polystyrene block to reduce fabrication costs, to avoid complicated wire connections, and to increase the uniformity of the segment alignment. Pressure Capsule. The pressure capsule employed in this new design is temperature compensated and con- structed so as to give approximately logarithmic re- sponse over the operating range—^the deflection per millibar at 50 mb being approximately five times the deflection at 1000 mb. Without affecting the useful sensitivity and accuracy at high pressure, these cap- sules provide an appreciable increase in accuracy and sensitivity at low pressures. The precision of pressure measurements depends upon such factors as repeatability of the mechanical motion of the aneroid and its lever system, the tem- perature compensation, the precision with which the surface pressure can be set on the commutator, and the reliability of the switching operation. It is esti- mated that the over-all probable error in pressure measurement of the present modulator units is: ±1 mb at
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