GAI-Tronics 4512-001 6-Channel Radio User and Installation Manual - Manual (Page 17)

Pub. 42004-387G
Model 4512-001, 4512-001FR, 4514-001, and 4514-001FR 6-Channel Radios Page 15 of 19
f:\standard ioms - current release\42004 instr. manuals\42004-387g.doc
02/15
Operation
Use the microphone to operate the radio in a standard push-to-talk/release-to-listen mode. Choose among
the six channels by rotating the channel selector switch. Keep transmissions short to avoid tying up the
channel. Continuous transmissions longer than 30 seconds will be terminated by a built-in transmit limit
timer (TOT).
N
OTE : This setting can be factory adjusted.
Note that units programmed with the CTCSS or DPL can only carry on two-way communications with
units which have identical CTCSS or DPL programming.
Initiating Calls
1. To initiate a call, press the microphone button. Always allow a short delay before speaking to allow
time for the radio channel to be established.
2. Speak directly into the microphone held approximately 1/2 inch from the mouth. The microphone
button must be held down while talking to the radio user and released to listen.
N
OTE : The speaker is muted during transmission. To un-mute, move the shorting jumper P4 from
P4-1/P4-2 to P4-2/P4-3.
3. When the transmission is completed, the radio returns to the receive mode.
Receiving Calls
When power is applied, the radio is in the receive mode, allowing receive audio to be heard through the
speaker. The radio is always in receive mode unless the microphone button is pressed. To reply to a call,
wait until the caller has finished speaking, then press the microphone button and reply.
Controls
Use the rotary frequency switch on the top of the unit to select the radio channel. The multi-color LED
indicates the radio channel status.
 Green: Indicates power is on/idle condition
 Flashing yellow: Indicates channel activity (in use)
 Red: Indicates transmitter on (PTT active)