User's Manual

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BK RADIO

Page 3-1

SECTION III

OPERATION

3.1 INTRODUCTION

This section contains information concerning the operation procedures of the GMH Series radio.

Information on programming and installation is contained in Section 2 of this manual.

3.1.1 Safety precautions

A. Do not operate the transmitter in close proximity to blasting caps.

B. Do not operate the radio in an explosive atmosphere (petroleum fuels, solvents, dust, etc.).

C. Do not operate the transmitter if a person outside the vehicle is within two feet of the antenna

or touching the antenna.

D. Do not install the radio in a closed compartment that contains an LP gas container or its

fittings.

E. The radio must be properly grounded.

F. The equipment must be installed and serviced by a qualified technician.

3.2 BASIC OPERATION

3.2.1 Receive

URN POWER ON

by turning the Volume knob clockwise past the OFF detent.

The radio will beep, indicating that it has passed its self test and is operational.

ET 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.

ELECT A CHANNEL GROUP

(if applicable) by pressing the GRP button and

turning the Channel Select knob. Press the GRP button again to return to

channel select mode. See “GRP” on page 3-5.

ELECT 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.

Summary of content (8 pages)

PAGE 1
SECTION III OPERATION 3.1 INTRODUCTION This section contains information concerning the operation procedures of the GMH Series radio. Information on programming and installation is contained in Section 2 of this manual. 3.1.1 Safety precautions A. Do not operate the transmitter in close proximity to blasting caps. B. Do not operate the radio in an explosive atmosphere (petroleum fuels, solvents, dust, etc.). C.
PAGE 2
Operation 3.2.2 GMH Series VHF Radio Transmit PRESS THE PTT (Push To Talk) switch on the microphone. The TX annunciator appears on the display and the red Transmit indicator glows 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).
PAGE 3
Operation 3.2.2 GMH Series VHF Radio Code Guard Transmit MONITOR THE CHANNEL, before transmitting on Code Guard channels, by lifting the microphone off hook or pressing the MON button. Listen to the channel for a few seconds to ensure that no communications are occurring on the channel. PRESS THE PTT (Push To Talk) switch on the microphone. The TX annunciator appears on the display and the red Transmit indicator glows while the PTT is pressed.
PAGE 4
Operation PA GMH Series VHF Radio Public Address Press the PA button to turn the Public Address system on or off. When PA is on, pressing the microphone PTT switch causes audio to be routed to the audio amplifier without enabling the transmitter. HOM Home Channel Press the HOM button to go to the pre-programmed Home Channel.
PAGE 5
Operation GSC GMH Series VHF Radio Group Scan Press the GSC button to enable or disable Group Scan operation. During Group Scan operation, the following features are disabled: Dual Priority Scan, User Code Guard, and Nuisance Channel Delete. Press the GSC button for 1 second or more to toggle the current channel’s group on or off the group scan list. SQL Squelch Adjust Press the SQL button to toggle between Squelch Adjust and Volume Adjust modes. Press the SQL button for Squelch Adjust mode.
PAGE 6
Operation GMH Series VHF Radio Scan Delay Scan delay allows the radio to receive a response to a transmission before scanning the other channels for activity. If you find that your scanner is restarting before message replies are heard, you can ask your dealer to increase the scan delay time. (0-7.5 seconds) Keyboard Microphone Operation If a keyboard microphone is used with the GMH radio, the following features may be enabled. Not all microphones support these functions.
PAGE 7
Operation GMH Series VHF Radio 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).
PAGE 8
Operation GMH Series VHF Radio Priority Mode C In priority mode C the priority channel is pre-programmed. This channel is displayed any time PRI is on, no matter where the Channel Select knob is set. Priority operation during scan operation is the same as with Priority Mode A, except that the priority channel is preprogrammed, not the selected channel. In priority mode C the transmitter always transmits on the priority channel when PR is on.