INTRODUCTION TO SONAR 



71.71 

 Figure 8-2. — AN/UQC-1 control unit. 



sent, but indicate pauses the operator makes so 

 that his transmission can be understood more 

 easily. 



LONGSHOT — THIS IS WEASEL — OVER 

 WEASEL — THIS IS LONGSHOT — OVER 



With communication established, WEASEL sends 

 his message: 



LONGSHOT — THIS IS WEASEL — BREAK- 

 AM READY — AT REQUIRED DEPTH — 

 SPEED — AND COURSE — BREAK — OVER 



LONGSHOT gives a receipt, using an abbreviated 

 call: 



THIS IS LONGSHOT — ROGER — OUT 



Following is an example of a related series 

 of messages between ships conducting an ASW 

 exercise. 



at ranges out to 12,000 yards. Under the same 

 conditions, submarines achieve a greater range. 

 If the submarines are operating in a sound 

 channel (described in chapter 4), the communica- 

 tion range may be many miles greater than that 

 achieved by ships. 



Local noise, caused by ship's movement 

 through the water, machinery, screws, etc., can 

 reduce the range to less than half the normal 

 range. Severe reverberation effects may also 

 cause a reduction in range, but you can overcome 

 them by spealdng slowly, pausing after each word 

 to let the echoes die out. At very short ranges it 

 may be impossible to reduce the receiving gain 

 to a comfortable speaker output level. Then, 

 you must speak softly, holding the microphone 

 away from your lips. 



VOICE PROCEDURE 



As mentioned earlier, you will use the same 

 voice procedures for underwater voice communi- 

 cation as for radiotelephone transmissions. In 

 other words, you call the station for which you 

 have a message, identify yourself, send your 

 message, and end the transmission with either 

 OVER or OUT. 



Calling and Answering 



Here is an example of a call from a sub- 

 marine (call sign WEASEL) to an ASW ship (call 

 sign LONGSHOT). Dashes shown are not actually 



DOUGHBOY — THIS IS BIG BEN — BREAK- 

 CEASE ECHO RANGING DURATION MY 

 ATTACK — BREAK — OVER 



BIG BEN — THIS IS DOUGHBOY — ROGER- 

 BREAK— INFORM DOUGHBOY THIS CIR- 

 CUIT WHEN ATTACK COMPLETED - 

 OVER 



DOUGHBOY — THIS IS BIG BEN — ROGER- 

 OUT 



Correcting an Error 



If you make an error in transmission, send 

 the proword CORRECTION immediately. Go back 

 to the last correctly sent word, repeat it, and 

 continue with the correct version. Example: 



WEASEL — THIS IS LONGSHOT — BREAK — 

 ALLHERE— CORRECTION— ALL CLEAR 

 SURFACE — BREAK — OVER 



Walts 



When an operator finds it necessary to delay 

 transmission momentarily, he sends the proword 

 WAIT. If the delay is for longer than a few 

 moments, the transmission is WAIT OUT. A new 

 call is made when communication is resumed. 



Repetitions 



The request for a repetition is SAY AGAIN, 

 not "Repeat." Used alone, SAY AGAIN means 



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