APCO first proposed Morse code brevity codes in the Police radio 10 codes pdf 1935 issue of The APCO Bulletin, which were adapted from the procedure symbols of the U. 1937 to reduce use of speech on the radio at a time when police radio channels were limited. Experienced radio operators knew the first syllable of a transmission was frequently not understood because of quirks in early electronics technology.
4 of a second to “spin up” to full power. Preceding each code with “ten-” gave the radio transmitter time to reach full power. 10-20 for “where are you? For example, in the NYPD system, Code 10-13 means “Officer needs help,” whereas in the APCO system “Officer needs help” is Code 10-33. New Zealand Police ten-code 10-7, which means “Unit has arrived at job”. Beyond”, Leonardo uses the code 10-33 in a message to signal that he is in a situation beyond his control. While ten-codes were intended to be a terse, concise, and standardized system, the proliferation of different meanings can render them useless in situations when officers from different agencies and jurisdictions need to communicate.
Out of service–subject to call. Advise weather and road conditions. We have prisoner in custody. Complete present assignment as quickly as possible. Call this station by telephone. Take no further action last information. Trouble at station–unwelcome visitors–all units vicinity report at once.
Do you have contact with? Operator or officer on duty? Can you obtain automobile registration information? Does not conform to rules and regulations. Emergency traffic at this station–clear? Advise if Officeravailable for radio call.
Is wrecker on the way? Is ambulance on the way? What is your next message number? Unable to copy phone–use CW. The 80 series is reserved for assignment by nets for local use.