User's Manual

Operation GMH Series VHF Radio
BK RADIO
Page 3-7
In numeric mode, the display shows the selected channel (Ch 5) with the Code Guard value
channel (9) to the right. The CG annunciator appears on the display to indicate that the Code
Guard has been changed from its original programming.
In alphanumeric mode, the display shows the label for the Code Guard value channel
(ALPHA 9) briefly when changing to Channel 5, then the display shows the label for the
selected channel (ALPHA 5). The CG annunciator appears on the display to indicate that the
Code Guard has been changed from its original programming.
CHANNEL SCAN
Press the SCN button to start or stop scanning channels in the scan list. Scan operation occurs only
while the radio is not transmitting. Scan operation is indicated on the display by the flashing SCN
annunciator (alphanumeric mode) or two flashing bars (numeric mode).
The radio scans all channels in the scan list for activity. When activity is detected, the radio receives
the active channel, and the channel name or number appears on the display.
Channels in the scan list are pre-programmed. To determine which channels are in the scan list,
select a channel with the channel knob. If it is in the scan list the SCN annunciator appears in the
display.
To add or delete the current channel from the scan list, press the SCN button and hold it down for 1
second or more. A beep sounds when the scan list change is executed.
PRIORITY SCAN
Press the PRI button to start or stop priority scanning. Priority scan operation occurs only while the
radio is not transmitting. Priority scan operation is indicated on the display by the PR annunciator and
either the flashing SCN annunciator (alphanumeric mode) or two flashing bars (numeric mode).
To make the current channel the fixed priority channel, press the PRI button and hold it down for 1
second or more. A beep sounds and the PR annunciator appears when the priority channel change is
executed. This occurs in priority scan modes B, C, and D, but not A.
The GMH radio can be programmed with one of four priority scan modes: A, B, C, and D.
Priority Mode A
The channel selected with the Channel Select knob becomes the priority channel as well.
When scanning with the PRI button on, the receiver checks the priority channel for activity. If
activity is detected by scanning and the receiver stops on a channel other than the priority
channel, the receiver continues to check the priority channel for activity. If, in this condition,
activity is detected on the priority channel, the receiver receives the priority channel activity
for the duration of the transmission, then returns to scanning operation. The yellow Priority
Indicator glows during the priority reception. The radio transmits on the channel selected with
the Channel Select knob.
Priority Mode B
In priority mode B the priority mode is fixed in programming and indicated by the PR
annunciator when the priority channel is selected. Priority operation during scanning is the
same as with Priority mode A, except that the priority channel is pre-programmed, not the
selected channel. However, with any channel selected other than the fixed priority channel
with SCN off and PRI on, the receiver checks the priority channel while receiving on the
selected channel. If activity is detected on the priority channel, the receiver switches to
receive the priority channel for the duration of the transmission, then returns to the selected
channel. The transmitter transmits on the knob-selected channel while operating in priority
mode B.