Operating instructions

Operation DMH Series VHF Radio
Page 3-20 BK RADIO
radio to transmit on the knob-selected channel with the emergency bit set, indicating
an emergency condition. If the Channel Selector is changed, the Emergency Mode
will follow to the newly selected channel. Cycle power to return the radio to normal
operation.
On channels programmed for analog transmissions, and channels programmed for
Mixed Mode transmissions with the ‘TX Digital’ switch OFF, pressing PTT in
Emergency Mode will result in a normal analog transmission.
3.15 USER SELECTED CHANNEL GUARD
User Selected Channel Guard is only available on radios equipped with a keypad
microphone. Not all microphones support this function. Contact your dealer to
determine which features are available with your microphone and have been enabled
in the radio.
When the radio is being programmed with transmit and receive frequencies for each
channel, a receive Channel Guard value and a transmit Channel Guard value can
also be assigned to each channel. If User Channel Guard Selection is enabled, the
Channel Guard values for any channel can be copied to another channel in the
radio. On channels programmed for Analog operation only, the CTCSS or CDCSS
guard values will be copied. On channels programmed for Digital operation only,
NAC’s only will be copied unless the radio is programmed to also copy the Talk
Group ID (TGID), Mode (Digital, Analog or Mixed) and Squelch setting (Normal or
Selective). On Mixed Mode channels, Analog or Digital values will be copied as
needed.
For example, to use the Channel Guard values of Channel 9 with the frequencies of
Channel 5:
1. Turn Scan and Priority Scan OFF.
2. Turn the Channel Selector knob to Channel 5.
3. Press the [9] key on the microphone keypad. The display shows CG.
The radio will now operate on the frequencies of Channel 5 with Channel 9
Channel Guard values. The display shows the Channel Guard channel (9), and
then the selected channel (5).
4. Press the microphone’s [#] key to display the Channel Guard channel briefly.
The display shows the group number, followed by the Channel Guard channel,
and then the selected channel.
5. Press the [0] key to reset all values to the original programming, or press
different number keys (1-16) to select a different set of Channel Guard Values.
NOTE:
During Scan or Priority Scan, the receiver does not use the user-selected
Channel Guard values. However, user-selected Channel Guard values
are used by the transmitter in Scan Mode.