[CW] List of prosigns

[Radio KØHB]

ACP 113 is the Allied Callsign Book for Ships.

ACP 124 is Radiotelegraph Procedures.  

It defines AA (overscored) as “Unknown station”
It defines AA (no overscore) as “All after”
It defines AR (overscored) as “End of transmission – no answer expected or desired”
It defines BT (overscored) as “Long break”
It defines K as “Invitation to transmit”

73, de Hans, KØHB
"Just a boy and his radio"™
Master Chief Radioman, USN

From: D.J.J. Ring, Jr.
Sent: Thursday, July 25, 2019 3:56 AM
To: CW Reflector
Subject: Re: [CW] List of prosigns

AA as a procedure sign (prosign) sent as one signal came from American Morse where it meant the character "comma" or ",".

The interesting one for me was BT which was from Western Union for "Begin Text" and what I always thought was "HERE" which fits the use but it's actually "HAND READY." That is, have your hand ready to write (or type.)

Prosign AR is cross or plus sign (+). And is used for "End of Message" or infrequently for addition sign, with minus sign being hyphen (-), multiplication (X) and division (/) slant sign.

I think HR and BT were explained in Allied Communications Procedures (ACP) book, maybe ACP 113 Radiotelegraph Procedures.

73

David N1EA 

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