User's Manual

Operation DMH Series VHF Radio
BK RADIO Page 3-5
3.5 BASIC OPERATION
3.5.1 RECEIVE
Turn power on by pushing and releasing the Volume knob. The radio will beep,
indicating that it has passed its self test and is operational.
Set volume by pressing the [MON] button to hear squelch noise. Turn the Volume
knob to set a comfortable volume level. Press the [MON] button again to stop
squelch noise.
Select a channel group (if applicable) by pressing the [GRP] button and turning the
Channel Selector knob. Press the [GRP] button again to return to Channel Select
mode.
Select a channel by turning the Channel Selector knob. After reaching the highest
number, the radio wraps to Channel 1.
The display can show channel numbers (numeric mode), channel labels
(alphanumeric mode), or receive and transmit frequencies. The Display mode and
Channel Labels are programmed by the technician along with group labels (if
applicable) and channel frequencies. The display shows slightly different indications
during Channel Scan and Priority Scan operation in alphanumeric and numeric
modes.
3.5.2 TRANSMIT
Press the PTT (Push To Talk) switch on the microphone. The TX annunciator
appears on the display and the red Transmit indicator illuminates while the PTT is
pressed. Talk in a normal voice with the microphone approximately one to two inches
from your mouth. Release the PTT switch to stop transmitting.
If the TX annunciator does not appear and a tone is heard, you are on a receive-only
channel or the channel is busy (if Busy Channel Lockout is enabled). Turn the
Channel Selector knob to an authorized transmit channel or wait until the channel is
clear (if Busy Channel Lockout is installed).
If the length of your transmission exceeds the preset Time-Out Timer setting, the
transmitter automatically shuts off and a tone sounds. To continue the transmission,
release the PTT switch, and then press it again and continue talking.
3.6 CHANNEL GUARD OPERATION
Channel Guard allows one radio or group of radios to be selectively called within a
system. If the radio has been programmed with Channel Guard, use the following
receive and transmit instructions.
3.6.1 ANALOG SQUELCH CONTROL
Sub-audible signaling (CTCSS/CDCSS) is used to allow a group of radios to be
selectively called in a system. Programming the receive guard equal to zero allows
for Carrier Squelch operation, where the radio will unmute whenever a carrier is
detected.