Simplex Channels
The M.F.S. use the SA-GRN for all voice communications. This consists of trunked communications for command and control, and simplex frequencies for some fire-ground operations. The simplex frequencies are generally used with low power portable radios so they cannot be heard from a long distance.

K Code	Usage
K0	Not available to respond
K1	Responding to Incident
K2	Arrived at Incident
K3	At Incident available to run
K4	Mobile and available in home area
K5	Off and clear at home station
K6	Available in another stations area
K7	At another station...
K8	(Appliances) = Delayed response
K8	(On call) = Available at home
K9	(Appliances) = Vehicle unattended
K9	(On call) = On pager

K24	Dangerous goods info required
K24 - 2	Dangerous goods info to follow
K30	Received stop for Incident
K31-1	Respond Priority 1
K31-2	Respond Priority 2
K32	Request alarm status
K32 - 2	Alarm has cleared
K32 - 3	Alarm has not cleared
K33	Alarm details to follow
K34	Details to follow
K37 - (CH)	Change to channel xx
K38	Initial control
K38 - 2	Initial control centre
K38 - 3	Incident control centre
K39	Change of command (Name)

K40	Bomb alert
K41	Fatality/ies
K42	Persons reported...
K43	Persons accounted for
K44	Appliances involved for extended time
K45	No further developments

K55	Arrived on scene, Special services incident (Vehicle accident, storm damage etc)
K66	Arrived on scene, Rubbish, grass etc. fire
K77	Arrived on scene, No sign of fire
K88	Arrived on scene, Small property fire
K99	Arrived on scene, Well Involved

Channel	Frequency	NAC
181	462.0375	181
182	415.475	182
183	422.6375	183
184	422.8875	184
185	426.0375	185
186	426.2875	186
187	415.475	187
188	422.6375	188
189	422.8875	189
190	426.0375	190
191	426.2875	191