BK Radio DMH APCO Project 25 Operation & User’s Manual
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BK Radio DMH APCO Project 25, 38 BK Radio NOTES: DMH Owner’s Manual 3 TABLE OF CONTENTS Features..................................................................... Inside Front Cover FCC Requirements .................................................................................4
4 BK Radio INTRODUCTION This section contains information concerning the operational procedures for BK Radio DMH APCO Project 25 digital mobile radios. To meet backwards compatibility as defined by the APCO Project 25 standard, the DMH digital mobile radio provides us
BK Radio DMH APCO Project 25, 36 BK Radio CHANNEL LABELS You can program the radio with a label for each of the 25 channel groups and a label for each of the 16 channels within each group. To display the channel number associated with a channel label: 1. Press the microphone’s [#] key to display the group number. 2. Press the [#] key again to display the channel number. 3. Press and hold the [#] key to display the channel label. 4. Press the [ENT] key or wait for about 5 seconds to revert to normal radio operation. Ea
6 BK Radio FEDERAL COMMUNICATIONS COMMISSION REGULATIONS The FCC rules require manufacturers to comply with the FCC RF energy exposure limits for mobile 2-way radios before they can be marketed in the U.S. When 2-way radios are used as a consequence of employment, the FCC req
BK Radio DMH APCO Project 25, 34 BK Radio BUSY CHANNEL INDICATION The yellow Busy Channel Indicator glows if there is carrier activity on the selected channel. If the selected channel is a Channel Guard channel and the proper Channel Guard value is not detected, the Busy Channel Indicator remains on for the duration of the carrier activity and no message is heard. During Scan and Priority Scan operation, the Busy Channel Indicator glows when activity is detected on any channel on the Scan List. When scanning or priority scanning Channel Guard channels with the CG (Channel Guard Disable) button OFF an
BK Radio DMH APCO Project 25, 8 BK Radio BK RADIO SCN PRI GRP SQLMON VOL OFF - CH GMH Transmit Indicator Priority Indicator Busy Channel Light Function Button On/Off Indicators Display Dimming Sensor Function Buttons Channel Selector Knob On/Off Volume Knob Microphone Connector RADIO CONTROLS BASIC OPERATION RECEIVE 1. 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. 2. Set volume by pressing the [MON] button to hear squelch noise. Turn the Volume knob to set a comfortable volume level.
BK Radio DMH APCO Project 25, 32 BK Radio 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
BK Radio DMH APCO Project 25, 10 BK Radio APCO PROJECT 25 SQUELCH CONTROL Network Access Codes (NACs) provide the digital equivalent of analog sub-audible signaling (CTCSS/CDCSS) allowing a group of radios to be selectively called within a system. Users in the same area (using the same NAC) can be further divided into Talk Groups, with each group having its own Talk Group ID (TGID). Group Calls are made by designating both the users’ NAC and TGID. Each radio also has an individual P25 unit ID. A Unit- to-Unit call contains the addressee’s NAC, and uses the addressee’s P
BK Radio DMH APCO Project 25, 30 BK Radio 1. Press the [#] key to toggle a decimal on or off to the right of the character in position 7. The decimal moves left with the number in position 7 as new numbers are entered. 2. Use the following steps to enter a number in position 8 or characters in positions 1-8: a. Press the [PRI] key repeatedly to cycle through characters 0-9, A-Z, -, *, $, /, +, %, \, |, _, <, >, h, blank, then back to the start again. If you pass the desired character, press the [PRI] key repeatedly until you return to the start and reach that ch
BK Radio DMH APCO Project 25, 12 BK Radio CHANNEL GUARD TRANSMIT 1. Monitor the channel, before transmitting on Channel 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. 2. 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 m
BK Radio DMH APCO Project 25, 28 BK Radio If Unit-To-Unit Mode is entered when the RTX channel is programmed for analog-only transmissions, pressing PTT will cause the radio to beep until PTT is released. The user must select a channel capable of digital transmissions before placing a Unit-To- Unit call. If the RTX channel is programmed for Mixed Mode transmit, transmissions will be made as digital Unit-To-Unit calls while the radio is in Unit-To- Unit Mode, regardless of the position of the ‘TX Digital’ switch. INITIAT
BK Radio DMH APCO Project 25, 14 BK Radio The display indicates Secure Operation as follows: 1. In Standby Mode, if the radio will transmit in Secure Mode when PTT is pressed, the encrypt icon flashes in the display. 2. When receiving or transmitting an encrypted signal, the encrypt icon flashes in the display. TRANSMIT KEY SELECTION The radio can hold up to 32 DES or AES encryption keys. Each channel is assigned a default key for transmit. The key can be locked to the channel, or if programming allows, a transmit key other than the default key can be selected from the radio’s Key Pick List. If a key is selec
BK Radio DMH APCO Project 25, 26 BK Radio To reply to a message heard on the priority channel, press the PTT switch. The radio transmits only on the priority channel when Priority Scan is on. Once activity has ceased on the priority channel, the radio returns to scan operation. CHANGE THE PRIORITY 1 CHANNEL The fixed Priority 1 channel can be permanently set or can be changeable. If the radio has a changeable priority channel, use the following steps to make this change. 1. Turn Scan and Priority Scan off. 2. Turn the Channel Selector knob to the channel you want to enter as the new Priority 1 chann
16 BK Radio Standard Functions Optional Functions MON Monitor Squelch Noise TA Repeater Talk Around GSC Group Scan SCN Channel Scan CG Channel Guard Disable PA Public Address PRI Priority Scan HOM Home Channel SEC Transmit Secure GRP Group Select SPK Remote Speake
BK Radio DMH APCO Project 25, 24 BK Radio Dual Priority Scan is automatically disabled when Group Scan is on. OLD-STYLE BK PRIORITY SCAN The radio can be programmed with one of three Priority Modes: A, B, or C. The table below shows how the priority channels and the transmit channels are selected in each mode. Mode A Mode B Mode C Priority Channel Channel Knob Preset Preset Transmit Channel Channel Knob Channel Knob Priority Channel Priority Mode A With Scan In Priority Mode A, the pr
BK Radio DMH APCO Project 25, 18 BK Radio Press the [SQL] button for Squelch Adjust Mode. Turn the Volume knob to adjust the squelch setting. Turning the knob counter- clockwise tightens the squelch setting, allowing only stronger signals to open the squelch and be heard. In the absence of a held channel, the receiver will be tuned to the main channel. Guard qualification will be disabled during squelch adjustment. Return to Volume Adjust Mode by waiting 5 seconds, or by pressing the [SQL] button again. Pressing the [SQL] button and holding f
22 BK Radio CHANGE THE SCAN LIST The radio can be programmed to enable the user to add or remove channels from the scan list. If user changes are enabled, follow these steps to change the scan list: 1. Turn Scan and Priority Scan off. 2. Select a channel to be added or removed from the
BK Radio DMH APCO Project 25, 20 BK Radio PA 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. ACC Accessory Press the [ACC] button to turn the installed accessory on or off. Up to three ACC buttons may be installed for different accessories. SCAN OPERATION RECEIVE Scan operates only while the radio is not transmitting. The radio checks for signals on channels in the preset scan list, as well as the channel selected by the Channel Selector knob.
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