Operator's Manual, Communication Instructions, US Navy (DNC 6, 1939)

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• Please send me e-mail if you have any more of this document, or info on its date, etc.

These two chapters came in an old cloth-covered binder imprinted with
      Operator's Manual
Communication Instructions
              1939
          U.S. Navy

At some point the "Communications Instructions" and "1939" got marked through and "DNC 6" got stamped on.
(Note - the January 1944 edition with Changes 1 and 2 instructs that this be done)
Through Change 4, the pages are not marked DNC 6 but all the Change 5 pages are marked DNC 6.
So I am guessing that the original designation was changed at that time, whenever that was.

It looks like interesting information is missing - pages I-IV might have told us a little more about date and intended use. 
And it would be nice to see:
Appendix I - shore station circuits and frequencies - F broadcast schedules, etc.
Appendix III - international procedure per General Radio Regulations
Appendix VI - shore-based aircraft procedures
Appendix VIII - communications with merchant ships

Please send me e-mail if you have any more of this document, or info on its date, etc.

Download 12 MB pdf

Chapter 6. RADIO

Section A. General

• Fleet communications
• Ship radio communications
• Radio silence
• Replies from ships at sea
• Shore radio communications
• Aircraft communications
• Communications with merchant ships
• International distress and calling frequency
• Authentication
• Radio watch-keeping

Section B. Introduction to Procedure

• Reasons, basis, and use
• Operating rules and instructions
• Use of serial numbers

Section C. Radiotelegraph Procedure

• Prosigns
• Description and use of prosigns
• Message addresses
• Precedence prosigns
• Counting of groups
• Calling and answering
• Shore radio stations and indefinite call signs
• Repetitions, corrections, verifications, and acknowledgements
• Plaindress, abbreviated form
• The executive method
• F and I method
• F method by a shore station
• I method by shore stations
• Sample messages 1-4

Section D. Radiotelephone Procedure

• Purpose
• Component parts of a message
• Prowords
• Calling, answering, and transmitting simple messages
• Operating rules
• Executive method
• Additional procedure for airways radio stations and control towers

Section E. Radio Frequencies and Transmitter Adjustments

• Assignments of frequencies
• Classification of frequency bands
• Naval employment of frequencies
• Skip distance and fading
• Interference to naval circuits
• Frequency adjustments
• Monitoring and related services

Chapter 7. VISUAL PROCEDURE

A. Flashing Light and Semaphore Procedure

B. Flashing Light

C. Semaphore

D. Flag-Hoist Signaling

E. Miscellaneous