AEROGRAPHER'S MATE 3 & 2 



given time. The recording speed of this facsimile 

 machine can be set at 60, 90, or 120 scans 

 per minute. The AN/UXH-2 automatically ad- 

 justs for the proper recording level phases, 

 records, and stops under control of the received 

 signals. The roll or recorder paper has mark- 

 ings on it to indicate when the roll should be 

 changed; a limit switch stops the recorder when 

 there is about 2 inches of paper left. 



With either the frequency carrier shift or 

 the audiofrequency shift methods of transmitting 

 facsimile signals, the output of the radio re- 

 ceiver at the receiving station is an audio- 

 frequency shift signal of constant amplitude. 

 The function of the frequency shift converter 

 CV-172( )/U (fig. 7-10) is to convert the re- 

 ceiver's output to an amplitude-modulated signal 

 that varies between 1200 and 2300 Hz which is 

 the signal required for proper operation of the 

 facsimile recorder. 



The CV-172( )/U is not the only frequency 

 shift converter used by the Navy in facsimile 

 installations, but is the one most commonly 

 found aboard ship. The other models you may 

 encounter are models CV-97/UX and the CV- 

 1066/UX. They all perform the same functions. 



The AN/UXH-2 Facsimile Recorder is being 

 used aboard naval ships and at selected Naval 



Weather Service Units primarily as a backup 

 to the Alden facsimile. 



RADIO RECEIVERS 



Modern Navy radio receivers are easy to 

 operate and maintain. They are capable of re- 

 ceiving several types of signals and can be 

 tuned accurately over a wide range of fre- 

 quencies. Their size is relatively small when com- 

 pared to the size of most transmitters because 

 they do not produce or handle large currents 

 and voltages. 



R-390A/URR 



Operating in the frequency range 500 kHz 

 to 32 MHz, radio receiver R-390A/URR (fig. 

 7-11) is a continuous tunable, high performance, 

 general purpose receiver for both shipboard 

 and shore station use. It can receive CW, MCW, 

 AM radiotelephone, and frequency shift radio- 

 teletype and facsimile signals. It is also an 

 excellent SSB receiver when used in conjunc- 

 tion with single- sideband converter CV-591( )/ 

 URR. 



The tuning knob turns a complex arrange- 

 ment of gears and shafts to indicate the fre- 

 quency, to which the receiver is tuned, on a 

 very accurate counter-type dial. The dial is 

 calibrated in kilohertz, and the frequency read- 

 ing accuracy of this tuning dial permits use 

 of the receiver as an accurate frequency meter. 



Figure 7-10. — Frequency Shift Converter CV-172 ( ) /U. 



132 



70.85 



