. Aerographer's Mate 3 & 2. United States. Navy; Meteorology; Oceanography. Chapter 7 —COMMUNICATIONS EQUIPMENT AND OPERATIONAL PROCEDURES. FREOUENCY SHIFT CONVERTER CV-483/URA-I7 unit is not required. The physical size of the AN/URA-17( ) is further reduced by using transistors and printed circuit boards. The com- plete equipment is less than half the size of the older AN/URA-8( ). Proper tuning of the receivers feeding these converters is important. Good communications are often the result of a properly tuned receiver. Each converter has a small oscilloscope mounted in the front which su
. Aerographer's Mate 3 & 2. United States. Navy; Meteorology; Oceanography. Chapter 7 —COMMUNICATIONS EQUIPMENT AND OPERATIONAL PROCEDURES. FREOUENCY SHIFT CONVERTER CV-483/URA-I7 unit is not required. The physical size of the AN/URA-17( ) is further reduced by using transistors and printed circuit boards. The com- plete equipment is less than half the size of the older AN/URA-8( ). Proper tuning of the receivers feeding these converters is important. Good communications are often the result of a properly tuned receiver. Each converter has a small oscilloscope mounted in the front which supplies the operator with a visual presentation of the input signal into the converter. Refer to figure 7-16 for ex- amples of how the correct scope presentation should appear when the receiver has been properly tuned. Figure 7-15. — Converter-Comparator Group AN/ URA-17 ( ). station use. In frequency diversity operation, the two receivers are tuned to different carrier frequencies carrying identical intelligence. In diversity reception, the audio output of each receiver is connected to its associated frequency shift converter, which converts the frequency shift characters into pulses. The (or mark-space) pulses from each con- verter are fed to the comparator. In the com- parator, an automatic circuit compares the pulses and selects the stronger mark and the stronger space pulse for each character. The output of the comparator is patched to the teletypewriter. The converter units can also be used individually with separate teletypewriters to copy two dif- j ferent FSK signals. The newest converter-comparator group, the AN/URA-17( ), is a completely transistorized equipment designed to perform the same func- tions as the AN/URA-8( ). Since present pro- curement of frequency shift converters is confined to the AN/URA-17( ), there are relatively few installations having AN/URA-8( ) converters. The AN/URA-17( ) consists of two identical converter units; each conv
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