11.3 Radios, Phonetic Alphabet & 10-Codes

11.3 Radios, Phonetic Alphabet & 10-Codes

Quick answer: Security communications systems — two-way radios, telephones, PA, and intercoms — only help if the message is heard, understood, and actionable. Class D officers use professional radio etiquette, spell critical details with the NATO phonetic alphabet, understand common 10-codes when a site uses them, and shift to plain language when post orders or multi-agency response require it.

Why communications systems training matters

Observation without communication leaves a supervisor blind. Communication without discipline clogs the channel, broadcasts confidential information, or creates misunderstandings that waste response time. Florida Class D curriculum includes communications systems as its own topic because officers on patrol, at events, and during emergencies depend on shared radio discipline as much as on locks or cameras.

Two-way radio etiquette

Most posts use portable radios on a shared frequency or talkgroup. Professional habits include:

• Listen before you talk — wait for a break so you do not "step on" another transmission.
• Press, pause, speak — key the mic, wait a beat, then speak; release when finished so others can reply.
• Identify yourself — use your assigned call sign or post name ("Gate 2 to Base") rather than unnamed chatter.
• Be brief and plain — state location, situation, and what you need; avoid jokes, sarcasm, and long stories on an operational channel.
• Speak clearly — moderate pace, across the mic, not shouting; shield from wind when outdoors.
• Acknowledge — confirm you received instructions ("Copy" / "10-4" if that is site language) so the sender knows the message landed.
• Protect sensitive information — do not broadcast names of juveniles, medical details, alarm codes, Social Security numbers, or exact combinations of a safe over an open or easily monitored channel; switch to phone or face-to-face when required.
• Emergency traffic — when life safety is involved, keep the channel clear after the initial call so responders can coordinate.

A useful emergency radio format is: who you are, where you are, what is happening, what you need — for example, "Base, this is Patrol 3 at Dock Door B, smoke in the warehouse, request fire department and evacuate the east wing."

Telephone, PA, and intercom

Not every message belongs on the radio:

PA announcements during emergencies should give a simple instruction and a destination ("Attention: leave the building using the nearest exit and assemble in Parking Lot C") rather than graphic detail about the hazard. Intercoms are access-control tools: an officer who unlocks a door without verifying the visitor has defeated the system.

NATO phonetic alphabet

Spelling names, tag numbers, and license plates over a noisy radio fails when "B" sounds like "D" or "M" sounds like "N." The internationally standardized NATO phonetic alphabet assigns a distinct word to each letter:

Example: plate "BKG 472" becomes "Bravo Kilo Golf four seven two." Officers should use the standard words, not homemade substitutes ("B as in boy"), because mixed systems create the confusion the alphabet was designed to prevent. Numbers are spoken clearly; some systems teach "niner" for 9 to avoid confusion with German "nein" or muffled "five," following aviation/military practice when the site requires it.

10-codes: awareness and plain-language preference

10-codes (ten-codes) are shorthand radio signals once common in public safety. Class D officers need awareness of frequently encountered codes because some clients and older post cultures still use them, for example:

• 10-4 — acknowledgment / OK
• 10-7 — out of service
• 10-8 — in service
• 10-9 — repeat
• 10-10 — fight in progress (varies by list)
• 10-20 — location ("What's your 20?")
• 10-33 — emergency / help needed (varies)
• 10-99 — wanted person / emergency (highly variable by agency)

Critical teaching point: 10-code lists are not universal. The same number can mean different things in different jurisdictions, which is dangerous during multi-agency incidents. For that reason, many modern agencies and NIMS/ICS-oriented guidance prefer plain language ("I need backup at the south gate — fight in progress") so fire, EMS, police, and private security all understand the same words. Florida Class D officers should:

1. Learn the codes their specific post uses, if any.
2. Default to plain language when speaking with outside agencies, during major emergencies, or whenever post orders say so.
3. Never invent codes or assume a visitor from another company shares the same list.

Putting systems together on post

A professional Class D communicator chooses the right tool, keeps radio traffic short, spells critical identifiers phonetically, protects confidential data, and switches to plain language when clarity for mixed responders matters more than shorthand. Those habits turn radios and PA systems from background noise into reliable life-safety tools on everyday posts and special events alike.