Figure 1-25.Comparator-Converter group AN/URA-17(C).

Figure 1-25.—Comparator-Converter group AN/URA-17(C). called diversity. When the URA-17 is operating in diversity mode, the signal comparator circuits in the equipment compare’ the signal strength and clarity of each received signal, and allow only the better signal to be routed to a printer. A properly tuned signal should appear as an "X" pattern centered on the middle lines inscribed on the CRT window (fig. 1-27, view A). If the pattern is shifted above the bottom inscribed line (view B), the radio frequency needs to be lowered slightly. If the pattern is shifted below the top inscribed line (view C), the radio frequency needs to be raised slightly. Each converter may also be used independently. When you operate a CV-483 in the single mode, the comparator  circuits  are  not  used.  Separate  radio- teletype  broadcasts  may  be  routed  through  each converter  and  sent  out  to  separate  printers.  Operation  of When the "X" pattern is centered, but the top and bottom pattern lines do not touch the top and bottom lines inscribed on the CRT (view D), the CV-483 "level" control must be increased. If the "X" pattern extends both above and below the top and bottom inscribed lines (view E), the "level" must be decreased. each individual CV-483 is not difficult. Operator controls are all on the front of the unit (fig. 1-26). In order to successfully copy RATT data, you must complete  the  following  steps: 1. Using switchboards and antenna patch panels, connect  an  appropriate  antenna  to  your  receiver(s),  and then  connect  your  receiver(s)  to  the  CV-483(s). Optionally, you may also patch radio output to an audio speaker. A RATT signal has a distinctive sound. With experience, you may be able to properly tune a RATT signal by sound alone. 2. Turn the power on with the power switch, and then place the function switch to the "tune" position. 3.  Then  tune  a  radio  receiver  to  a  listed radioteletype frequency. You may have to tune to 1.5 to 1.9 kHz above or below the actual listed frequency if copying sideband transmissions. The wave pattern in the cathode-ray tube window is used to properly adjust the signal. Figure 1-26.—Frequency Shift Converter CV-483/URA-17 front panel controls. l-41


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