Radioddity DB25-D Service manual

© Radioddity 2023 page 1 of 252
V3.0, September 23rd, 2023
Extended Manual for
DB25-D, DB40-D & GD-88

Radioddity Extended manual for Radioddity DB25-D, DB40-D & GD-88 v3.0
© Radioddity 2023 page 2 of 252
Please note that some of the features described within this Extended Manual are
available in digital mode whereas other features are available in analog mode
only. Besides that, not all radios do have the very same features. Our flagship
radio, the Radioddity DB40-D does come with the most features. In order to easy
identify those differences, we do use the following icons throughout this manual:
Described functionality is only available for digital DMR channels
Described functionality is only available for analog channels
The described function/feature is only available for the
Radioddity DB25-D.
The described function/feature is only available for the
Radioddity DB40-D.
The described function/feature is only available for the
Radioddity GD-88.

Radioddity Extended manual for Radioddity DB25-D, DB40-D & GD-88 v3.0
© Radioddity 2023 page 3 of 252
Table of Contents
Table of Contents...................................................................................................3
About Radioddity .................................................................................................14
1Disclaimer ..................................................................................................15
2Revision history of this document..........................................................16
3Product safety and RF exposure for portable radios............................17
3.1 Notes on the use of the radio.............................................................................. 17
3.2 Maintenance and Cleaning.................................................................................. 18
3.2.1 Maintenance.............................................................................................. 18
3.2.2 Cleaning ..................................................................................................... 18
4What is in the box?....................................................................................19
4.1 Bill of materials for Radioddity DB25-D ..................................................... 19
4.2 Bill of materials for Radioddity DB40-D ....................................................... 21
4.3 Bill of materials for Radioddity GD-88 ............................................................. 23
5Prepare radio for operation.....................................................................25
5.1 Radioddity DB25-D Preparation ................................................................. 25
5.1.1 Radioddity DB25-D preparation and mounting .............................. 25
5.1.2 Radioddity DB25-D Antenna connection ......................................... 26
5.1.3 Radioddity DB25-D power supply options ...................................... 27
5.1.3.1 Mobile Operation ........................................................................................................ 27
5.1.3.2 Base Station Operation ............................................................................................. 28
5.1.4 Replace fuse ....................................................................................... 29
5.1.5 Connect Speaker Microphone .......................................................... 30
5.2 Radioddity DB40-D Preparation .................................................................... 31
5.2.1 Radioddity DB40-D preparation and mounting ................................ 31
5.2.2 Radioddity DB40-D Antenna connection ........................................... 32
5.2.3 Radioddity DB40-D power supply options ......................................... 33
5.2.3.1 Mobile Operation ........................................................................................................... 33
5.2.3.2 Base Station Operation ................................................................................................. 34
5.2.4 Replace fuse ......................................................................................... 35
5.2.5 Connect Speaker Microphone ............................................................ 36

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5.3 Radioddity GD-88 Preparation ......................................................................... 37
5.3.1 Mount GD-88 Antenna ........................................................................... 37
5.3.2 Charge Radioddity GD-88 battery pack ................................................. 37
5.3.3 Install Radioddity GD-88 battery pack ................................................... 38
5.3.4 Install Radioddity GD-88 hand strap and belt clip ............................... 38
5.4 Accessories connection......................................................................................... 38
5.4.1 External speaker/headset and microphone .................................. 38
5.4.2 Radioddity DB25-D Speaker-Microphone ........................................ 39
5.5 Radioddity DB25-D radio controls .............................................................. 39
5.5.1 Parts description & function applications ....................................... 40
5.5.2 Left side of DB25-D ............................................................................ 41
5.5.3 Rear panel of DB25-D ........................................................................ 42
5.5.4 Speaker Microphone of DB25-D ....................................................... 43
5.5.5 Radioddity DB40-D Speaker-Microphone .......................................... 44
5.6 Radioddity DB40-D radio controls ................................................................ 44
5.6.1 Parts description & function applications .......................................... 44
5.6.2 Rear panel of DB40-D .......................................................................... 46
5.6.3 Speaker Microphone of DB40-D ......................................................... 47
5.7 Radioddity GD-88 radio controls ...................................................................... 48
5.8 Radioddity DB25-D display .......................................................................... 50
5.9 Radioddity DB40-D display ............................................................................ 50
5.10 Radioddity GD-88 display .................................................................................. 50
5.11 Status Icons ........................................................................................................... 51
5.11.1 Transmit / Receiving Icons ....................................................................... 53
5.11.2 LED Indicators ........................................................................................... 53
5.12 Keypad operations................................................................................................ 54
5.12.1 Keys and ENC (channel Selector) operation ........................................... 54
5.13 Main functions description.................................................................................. 55
5.13.1 Common functions ................................................................................... 55
5.13.2 Analog Functions .................................................................................. 56
5.13.3 Digital Functions ................................................................................... 56
5.14 Using the numeric keypad ................................................................................... 57
5.14.1 Alphanumerical input of characters........................................................ 57
5.14.2 Programmable Function keys .................................................................. 57
6Basic Operation .........................................................................................58
6.1 Turning the radio On/Off ..................................................................................... 58
6.2 Adjust Volume ....................................................................................................... 58
6.3 Adjust Squelch .................................................................................................. 58
6.4 Switch VFOs............................................................................................................ 59
6.5 Busy Channel Lockout ..................................................................................... 60

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6.6 Wide/ Narrow Band ......................................................................................... 60
6.7 DTMF for analog mode ................................................................................... 60
6.8 CTCSS / DCS ...................................................................................................... 61
6.9 Channel Selection ................................................................................................. 62
6.10 Switch between VFO and Channel Mode ........................................................... 62
6.11 VFO Frequency Set ................................................................................................ 62
6.12 Zone / Channel Selection ..................................................................................... 63
6.13 Monitor ............................................................................................................. 63
6.14 Permanent Monitor ......................................................................................... 63
6.15 Promiscuous Mode .......................................................................................... 63
6.16 Repeater / Talk Around ................................................................................... 64
6.17 Emergency Alarm ............................................................................................. 64
6.18 Scan On/Off ........................................................................................................... 65
6.19 Roaming On / Off.................................................................................................. 65
6.20 Pilot tone / Burst tone ..................................................................................... 65
7Using the radio menu ...............................................................................66
7.1 Accessing the menus and operations................................................................. 67
8Placing a PTT Call.......................................................................................68
8.1 High / Low power .................................................................................................. 68
8.2 Select the transmitting VFO ................................................................................. 68
8.3 Receive and answer to a digital radio call ................................................... 68
8.4 Initiate a digital radio call .............................................................................. 70
8.5 Talker Alias ....................................................................................................... 70
8.6 Receive and answer to an analog radio call ................................................ 70
9Special DMR functions .........................................................................71
9.1.1 Remote monitor ................................................................................... 71
9.1.2 Remote Kill ............................................................................................ 71
9.1.3 Radio Detection .................................................................................... 71
9.1.4 Radio Revive ......................................................................................... 71
9.1.5 Call Alert ................................................................................................ 72
9.1.6 GPS ........................................................................................................ 72
9.1.7 Record ................................................................................................... 72
9.1.8 DTMF ..................................................................................................... 72
9.1.9 Encryption ............................................................................................. 72
10 The radio Menu functions in detail.........................................................73

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10.1 Contacts ....................................................................................................... 73
10.1.1 Contact list ....................................................................................... 73
10.1.2 New Contact .................................................................................... 74
10.1.3 Manual Dial ...................................................................................... 75
10.1.4 Ham Contacts .................................................................................. 75
10.1.5 Ham Group Contacts ...................................................................... 76
10.2 Message ....................................................................................................... 77
10.2.1 Network support for short messages ..................................................... 77
10.2.2 CreateMsg ........................................................................................ 78
10.2.3 Common Messages CommMsg ..................................................... 78
10.2.4 Inbox ................................................................................................ 79
10.2.5 Outbox ............................................................................................. 80
10.2.6 Draftbox ........................................................................................... 81
10.3 Call Log ........................................................................................................ 81
10.3.1 Dialed Calls (DialedNumbs) ............................................................ 81
10.3.2 Received Calls .................................................................................. 82
10.3.3 Missed Calls ..................................................................................... 83
10.4 Scan ................................................................................................................... 83
10.4.1 Scan ....................................................................................................... 83
10.4.2 Scan List ................................................................................................ 84
10.4.3 Scan Mode ............................................................................................ 85
10.4.4 Roam Setting ........................................................................................ 85
10.4.5 Precautions for roaming........................................................................... 88
10.5 Zones & Channel .............................................................................................. 88
10.6 Local Set ............................................................................................................ 89
10.6.1 Language ....................................................................................... 89
10.6.2 Keypadlock ............................................................................................ 89
10.6.3 Backlight ................................................................................................ 89
10.6.4 LED indicator (LEDs) ............................................................................. 90
10.6.5 DisplayMode ......................................................................................... 90
10.6.6 VOX ........................................................................................................ 91
10.6.7 Channel Sw ........................................................................................... 92
10.6.8 ABRepeat ....................................................................................... 92
10.6.9 SemiRepeaterMode ........................................................................ 93
10.6.10 Factory Reset ........................................................................................ 94
10.7 Parameters ....................................................................................................... 95
10.7.1 TOT ........................................................................................................ 95
10.7.2 Power .................................................................................................... 95
10.7.3 Slot/Repeat ...................................................................................... 96
10.7.4 Sleep Mode ......................................................................................... 97
10.7.5 Encryption (ENC Level) .................................................................... 98
10.7.6 Squelch Level (SQ level) .................................................................. 98
10.7.7 Wide / Narrow Band (Bandwidth) .................................................. 98
10.7.8 Busy Channel Lockout (BCLO) ........................................................ 99

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10.7.9 Signaling ........................................................................................... 99
10.7.10 CTCSS Phase Reverse (Ctcss Tail) ................................................. 100
10.8 Tone Set ........................................................................................................... 100
10.8.1 Profiles ................................................................................................ 100
10.8.2 Key Tone (KeyTone) ............................................................................ 101
10.8.3 Power Tone ....................................................................................... 101
10.8.4 Message Tone (MsgTone) ............................................................. 101
10.8.5 Private Call Ring Tone (PCallTone) ............................................... 102
10.8.6 Group Call Ring Tone (G Call Tone) .............................................. 102
10.8.7 Alert Ring Tone (AlertTone) .......................................................... 102
10.8.8 FM Call Tone / Power On Tone ..................................................... 103
10.9 Appendix ......................................................................................................... 103
10.9.1 GPS ...................................................................................................... 103
10.9.2 FM Radio ............................................................................................. 104
10.9.3 Time ..................................................................................................... 105
10.9.4 DMR DTMF ..................................................................................... 106
10.9.5 Headset+Speaker / HandMic+ Speaker ........................................... 106
10.9.6 APRS .................................................................................................... 107
10.9.7 BlueTooth ..................................................................................... 109
10.10 Record ........................................................................................................ 109
10.11 Device Info ...................................................................................................... 110
10.12 Channel Edit ................................................................................................... 112
11 Prepare for using the CPS.......................................................................114
11.1 Install device driver............................................................................................. 114
11.2 Install CPS ............................................................................................................ 115
11.3 Start CPS .............................................................................................................. 118
11.3.1 Special functions ..................................................................................... 119
11.3.2 Safe factory settings to a file.................................................................. 119
11.3.3 Connect to the radio............................................................................... 119
11.3.4 Read codeplug from DB25-D, DB40-D or GD-88 .................................. 120
11.3.5 Safe codeplug to file (Safe as) ................................................................ 121
11.3.6 Safe codeplug to same file as before (Safe).......................................... 121
11.3.7 Write codeplug to DB25-D, DB40-D or GD-88 ...................................... 121
11.3.8 Open existing codeplug.......................................................................... 122
11.3.9 Factory Reset ........................................................................................... 122
12 Using the CPS to make changes to your settings................................124
12.1 Device Info ........................................................................................................... 124
12.1.1 Factory Number ...................................................................................... 124
12.1.2 Serial Number ......................................................................................... 125
12.1.3 Model Number ........................................................................................ 125
12.1.4 Firmware Version.................................................................................... 125
12.1.5 Version Data ............................................................................................ 125

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12.1.6 Frequency Range..................................................................................... 125
12.1.7 The Latest Update................................................................................... 125
12.2 Basic Parameters................................................................................................ 126
12.2.1 Radio Name ............................................................................................. 126
12.2.2 Language ................................................................................................. 126
12.2.3 TOT ........................................................................................................... 126
12.2.4 Busy Channel Lockout ............................................................................ 127
12.2.5 VOX........................................................................................................... 127
12.2.6 VOX Sensitivity......................................................................................... 127
12.2.7 Power-saving ......................................................................................... 127
12.2.8 Power Saving Ratio ............................................................................... 128
12.2.9 Save power startup time ...................................................................... 128
12.2.10 Scanmode ................................................................................................ 128
12.2.11 End-tone types ........................................................................................ 129
12.2.12 Squelch (A) Level ................................................................................. 129
12.2.13 Squelch (B) Level ................................................................................. 129
12.2.14 Radio ID ............................................................................................... 130
12.2.15 Rolling Code............................................................................................. 130
12.2.16 Backlight ON/OFF.................................................................................... 130
12.2.17 Keylock..................................................................................................... 130
12.2.18 Roaming................................................................................................... 131
12.2.19 Roaming Mode ........................................................................................ 132
12.2.20 RSSI Set .................................................................................................... 132
12.2.21 Connect Check Timer.............................................................................. 133
12.2.22 Connect Repeater Check Timer ............................................................. 133
12.2.23 Connect Time .......................................................................................... 133
12.2.24 Record Set ........................................................................................... 134
12.3 Common Menus.................................................................................................. 134
12.4 Prompt Tone........................................................................................................ 135
12.4.1 Profiles ..................................................................................................... 135
12.4.2 SMS prompt ........................................................................................ 135
12.4.3 Private Call Tone ................................................................................ 135
12.4.4 Group Call Tone ................................................................................. 136
12.4.5 Roaming restart prompt......................................................................... 136
12.4.6 Repeater lock prompt............................................................................. 136
12.4.7 Keytone .................................................................................................... 136
12.4.8 Keytone volume ...................................................................................... 136
12.4.9 Low Battery Alert tone .......................................................................... 137
12.4.10 Low Battery Alert volume ..................................................................... 137
12.4.11 Boot ringtone .......................................................................................... 137
12.4.12 Call hang up ........................................................................................ 137
12.5 Indicator............................................................................................................... 138
12.5.1 All Indicators............................................................................................ 138
12.5.2 TX Indicator.............................................................................................. 138
12.5.3 RX Indicator ............................................................................................. 139

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12.5.4 Scanning Indicator .................................................................................. 139
12.5.5 Low battery Indicator.............................................................................. 139
12.6 Preset Keys (programmable function keys) ..................................................... 140
12.6.1 Long Press Duration ............................................................................... 140
12.6.2 Available Function for the Preset Keys.................................................. 141
12.7 Mic Gain ............................................................................................................... 143
12.7.1 MIC Gain 1 ON/OFF................................................................................. 143
12.7.2 MIC Gain 1 ............................................................................................... 143
12.7.3 MIC Gain 2 ON/OFF................................................................................. 143
12.7.4 MIC Gain 2 ............................................................................................... 144
12.8 Quick Msg ....................................................................................................... 144
12.9 DMR Service .................................................................................................... 146
12.9.1 Remote monitor duration ................................................................. 146
12.9.2 Remote Monitor Decode ................................................................... 147
12.9.3 Remote Kill Decode ............................................................................ 147
12.9.4 Radio Detection .................................................................................. 147
12.9.5 Radio Revive ....................................................................................... 148
12.9.6 Call Alert .............................................................................................. 148
12.9.7 Group Call Hang Time ........................................................................ 148
12.9.8 Private Call Hang Time ....................................................................... 149
12.9.9 Import Delay ....................................................................................... 149
12.9.10 DTMF Duration (On-time) .................................................................. 149
12.9.11 DTMF Interval (Off-time) .................................................................... 149
12.9.12 DTMF Volume ..................................................................................... 150
12.9.13 DTMF code .......................................................................................... 150
12.9.14 GPS ...................................................................................................... 150
12.9.15 GPS interval ........................................................................................ 150
12.9.16 GPS channel ........................................................................................ 151
12.9.17 Mandown .......................................................................................... 151
12.9.18 Mandown Interval ............................................................................ 151
12.9.19 Mandown Angle ............................................................................... 151
12.9.20 Mandown Alarm Duration .............................................................. 151
12.9.21 Inactive Time ........................................................................................... 151
12.9.22 Pre-alarm Time........................................................................................ 152
12.9.23 Response transmission interrupt .......................................................... 152
12.9.24 Scrambling frequency............................................................................. 152
12.9.25 Keylock Password On/Off....................................................................... 152
12.9.26 Keypad Password.................................................................................... 152
12.10 APRS...................................................................................................................... 152
12.10.1 Analog APRS ........................................................................................ 153
12.10.2 Digital APRS ........................................................................................ 153
12.10.3 Manual TX Interval[s] ......................................................................... 153
12.10.4 APRS Auto TX Intervals[s] ....................................................................... 154
12.10.5 Beacon ..................................................................................................... 154
12.10.6 Latitude (degrees) ................................................................................... 155

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12.10.7 Longitude (degrees) ................................................................................ 155
12.10.8 TX Freq [MHz] ..................................................................................... 156
12.10.9 TX QT/DQT .......................................................................................... 156
12.10.10 Transmit Delay .................................................................................... 157
12.10.11 Prewave Time ..................................................................................... 157
12.10.12 Transmit Power .................................................................................. 157
12.10.13 APRS Tone ........................................................................................... 157
12.10.14 Destn SSID ........................................................................................... 158
12.10.15 Destn Call Sign .................................................................................... 158
12.10.16 Your SSID ............................................................................................. 158
12.10.17 Your Call Sign ...................................................................................... 159
12.10.18 APRS Symbol Table ................................................................................. 159
12.10.19 APRS Map Icon ........................................................................................ 159
12.10.20 APRS Signal Path ................................................................................. 161
12.10.21 Your Sending Text .............................................................................. 161
12.10.22 No ........................................................................................................ 161
12.10.23 Report Channel .................................................................................. 161
12.10.24 APRS TG ............................................................................................... 162
12.10.25 Report Slot .......................................................................................... 162
12.10.26 Call Type .............................................................................................. 163
12.10.27 PTT ....................................................................................................... 163
12.11 Encryption ...................................................................................................... 163
12.12 Contacts .......................................................................................................... 164
12.12.1 Contact list .......................................................................................... 164
12.12.2 Ham contacts ...................................................................................... 166
12.12.3 Ham groups ........................................................................................ 168
12.13 Digital Alarm List ........................................................................................... 170
12.14 Scan List ............................................................................................................... 170
12.14.1 Scan List ................................................................................................... 171
12.14.2 Talkback ................................................................................................... 171
12.14.3 Scan TX Mode .......................................................................................... 172
12.14.4 Appointed Channel ................................................................................. 172
12.14.5 Optional Channel .................................................................................... 172
12.14.6 Selected Channels................................................................................... 172
12.15 RX Group ......................................................................................................... 173
12.16 Zone [Channel] .................................................................................................... 174
13 Setup of channels....................................................................................175
13.1 Import channels from CSV-file .......................................................................... 175
13.2 Export channels into CSV-file............................................................................. 175
13.3 Add channels....................................................................................................... 176
13.4 Z-1......................................................................................................................... 176
13.5 CH mode .............................................................................................................. 176

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13.6 CH Name.............................................................................................................. 176
13.7 RX Freq ................................................................................................................. 177
13.8 TX Freq.................................................................................................................. 177
13.9 Power.................................................................................................................... 177
13.10 RX Only ................................................................................................................. 177
13.11 Alarm.................................................................................................................... 177
13.12 Prompt ................................................................................................................. 178
13.13 PCT (Private Call Type) .................................................................................. 178
13.14 RX TS ................................................................................................................ 178
13.15 TX TS ................................................................................................................ 179
13.15.1 DMR use with a simplex hotspot ...................................................... 179
13.16 RX CC (Color Code) ........................................................................................ 179
13.17 TX CC (Color Code) ......................................................................................... 180
13.18 Msg Type ......................................................................................................... 180
13.19 TX Policy .......................................................................................................... 180
13.20 RX Group ......................................................................................................... 181
13.21 Encryption List ............................................................................................... 181
13.22 Scan List ............................................................................................................... 181
13.23 Contact ............................................................................................................ 181
13.24 EAS (Emergency Alarm System) .................................................................... 182
13.25 Relay Monitor .............................................................................................. 182
13.26 Relay mode .................................................................................................. 182
13.26.1 Crossband analog to analog .................................................................. 182
13.26.2 Crossband digital to analog ................................................................... 183
13.26.3 Crossband analog to digital ................................................................... 185
13.26.4 Crossband/Crossmode digital/analog to analog.................................. 186
13.26.5 Crossband/Crossmode analog/digital to digital................................... 187
13.26.6 Crossband digital to digital ................................................................ 188
13.26.7 Same Frequency Repeater digital to digital .............................. 189
13.27 Bandwidth ...................................................................................................... 190
13.28 CTCSS sub audio and DCS signaling ............................................................ 190
13.28.1 Supported CTCSS frequencies ............................................................... 190
13.28.2 Supported DCS codes ............................................................................. 191
13.28.3 Supported DCS-I values (reverse DCS) .................................................. 191
13.29 RX SQ ............................................................................................................... 192
13.30 RX QT/DQT (RX CTCSS/DCS) ........................................................................... 192
13.31 TX SQ ................................................................................................................ 192

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13.32 TX QD/DQT (TX CTCSS/DCS) ........................................................................... 193
13.33 APRS...................................................................................................................... 193
14 Firmware Update ....................................................................................194
14.1 Firmware update ................................................................................................ 194
14.2 Install program for firmware update............................................................... 194
14.3 Perform Firmware update ................................................................................. 194
14.4 White or scrambled screen after firmware update ...................................... 199
14.5 Update failed....................................................................................................... 199
14.6 Perform Flash update......................................................................................... 200
15 Release notes...........................................................................................203
15.1 Firmware Release notes for DB25-D................................................................. 204
15.1.1 DB25-D firmware as of July 6th, 2023..................................................... 204
15.1.2 DB25-D firmware as of November 23rd, 2022 ...................................... 205
15.1.3 DB25-D firmware as of October 25th, 2022........................................... 205
15.1.4 DB25-D firmware as of December 11th, 2021....................................... 206
15.1.5 DB25-D firmware as of September 2nd, 2021 ....................................... 206
15.1.6 Initial DB25-D firmware as of May 12th, 2021 ....................................... 206
15.2 Firmware Release notes for DB40-D................................................................. 207
15.2.1 Initial DB40-D firmware as of August 5th, 2023..................................... 207
15.3 Firmware Release notes for GD-88 ................................................................... 208
15.3.1 GD-88 firmware as of September 12th, 2023 ........................................ 208
15.3.2 GD-88 firmware as of March 30th, 2023 ................................................ 209
15.3.3 GD-88 firmware as of November 21st, 2022 ......................................... 210
15.3.4 GD-88 firmware as of October 28th, 2022 ............................................. 210
15.3.5 Initial GD-88 firmware as of June 6th, 2022 ........................................... 210
15.4 CPS Release notes ............................................................................................... 211
15.4.1 CPS software as of August 1st, 2023 ...................................................... 211
15.4.2 CPS software as of November 11th, 2022.............................................. 211
15.4.3 CPS software as of October 20th, 2022.................................................. 211
15.4.4 CPS software as of July 1st, 2022 ............................................................ 212
15.4.5 CPS software as of September 6th, 2021 ............................................... 212
15.4.6 CPS software as of August 17th, 2021.................................................... 212
15.4.7 Initial CPS software as of June 1st, 2021 ................................................ 213
16 Quickstart for common use cases ........................................................214
16.1 Simplex analog FM operation with other station ........................................... 214
16.2 Duplex analog FM operation with a local analog FM-repeater .................... 215
16.3 Analog FM operation including analog APRS .................................................. 216
16.4 Simplex digital DMR operation with other station ......................................... 217

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16.5 Simplex digital DMR operation with a Single-HAT hotspot............................ 218
16.6 Duplex digital DMR operation with a Dual-HAT hotspot ............................... 219
16.7 Digital DMR operation with digital repeater ................................................... 221
17 Connectivity.............................................................................................223
17.1 Power connector of DB25-D and DB40-D........................................................ 223
17.2 Battery connector of GD-88............................................................................... 223
17.3 HF Antenna connector........................................................................................ 223
17.4 GPS antenna connector of DB25-D and DB40-D ............................................ 224
17.5 K1 connector of DB25-D and GD-88................................................................. 224
17.6 RJ45 Speaker-Microphone connector of DB25-D and DB40-D...................... 224
18 Technical specifications .........................................................................225
18.1 General specifications of the DB25-D............................................................... 225
18.2 Receiver of the DB25-D....................................................................................... 226
18.3 Transmitter of the DB25-D................................................................................. 226
18.4 General specifications of the DB40-D............................................................... 227
18.5 Receiver of the DB40-D....................................................................................... 227
18.6 Transmitter of the DB40-D................................................................................. 228
18.7 General specifications of the GD-88................................................................. 229
18.8 Receiver of the GD-88......................................................................................... 229
18.9 Transmitter of the GD-88................................................................................... 230
19 Certification .............................................................................................231
19.1 CE certificate for DB25-D ................................................................................... 231
19.2 FCC part 90 approval for DB25-D..................................................................... 232
19.3 CE certificate for DB40-D ................................................................................... 233
19.4 CE certificate for GD-88...................................................................................... 239
19.5 FCC part 90 approval for GD-88 ....................................................................... 243
20 Common problems and how to solve them.........................................245
21 Where to find support material ............................................................251

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About Radioddity
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buy from a reputable website at a high price, or try to save money by choosing a
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seasoned amateur radio operator, we always hope that with our products, prices,
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Radioddity has better met the needs of wireless device buyers by creating a
secure shopping experience. We do this by offering the highest quality products
at an affordable price and providing you with first-class service. You deserve no
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Our promise: to give you the best shopping experience
Strong partnerships enable us to offer you the latest technology and outstanding
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responsive customer service teams help us deliver on our promise to you and
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Whether providing you with the latest and greatest DMR and analog radios,
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Copyright© 2021-2023 by Radioddity
All rights reserved. This manual or any portion thereof may not be reproduced or
used in any manner whatsoever without the written permission of the publisher,
except for the use of brief quotations embodied in critical reviews and certain
other noncommercial uses permitted by copyright law. For permission requests,
write to the publisher.

Radioddity Extended manual for Radioddity DB25-D, DB40-D & GD-88 v3.0
© Radioddity 2023 page 15 of 252
1 Disclaimer
This document is intended as an enhanced version of the manual that comes with
the radio. It does describe all those details, that are required to know in order to
get the most out of your Radioddity DB25-D, DB40-D or GD-88.
For those new to DMR we advise to look at the document our engineers prepared
for them. Check the corresponding blog-entry for more details.
https://www.radioddity.com/blogs/all/radioddity-getting-on-air-with-your-dmr-radio
Those of you already familiar with analog and DMR operations, may just jump to
chapter 16 Quickstart for common use cases starting on page 214. However, and
although this manual is quite comprehensive, we do advise you to read it all
through. Especially DMR-operations may fail very easy if not all needed
parameters are set up as required.
In case something does not work as you´d expect it to, restart with a fresh and
new codeplug that only contains the minimum data required for the functionality
you think that is failing. If you still cannot get it working as expected, such minimal
codeplug and precise step by step instructions on how to reproduce your issue
makes it much easier for our support staff to get your issue sorted out. Our
support is available via [e-mail] only. If you find anything that
needs correction or should be added, please let us know via the very same email
address.
Windows™, Linux™and OS X™are the properties of their respective owners.
Should any trademark attribution be missing, mistaken or erroneous, please
contact us as soon as possible for rectification.
Not all functionality is available in both operating modes of the radio and for both
radios. For easier identification of those functionality, we used the following icons:
Parameter names, as displayed on the screen of the Radioddity DB25-D, DB40-D
or GD-88 are written bold&italic.
Described functionality is only available for digital DMR channels
Described functionality is only available for analog channels
The described function/feature is only available for the
Radioddity DB25-D.
The described function/feature is only available for the
Radioddity DB40-D.
The described function/feature is only available for the
Radioddity GD-88.

Radioddity Extended manual for Radioddity DB25-D, DB40-D & GD-88 v3.0
© Radioddity 2023 page 16 of 252
2 Revision history of this document
We are constantly trying to update our manuals according to changes resulting of
new firmware or CPS versions. If you miss any aspect in this document or believe
that something has been described incorrectly or in a misleading way, please feel
free to give us feedback at [e-mail]. We will try our best to make
the next version of this document of even more added value for you.
Revision
Changes
released
V3.0
•Added chapter for the Radioddity DB40-D
•Updated Firmware Release Notes for Radioddity
DB25-D, DB40-D and Radioddity GD-88
•Minor Additions and updates
2023-09-23
V2.2
•Updated Firmware Release Notes for Radioddity
DB25-D and Radioddity GD-88
•Description of new features (such as Talker Alias
and analog DTMF)
•Minor Additions and updates
2023-07-12
V2.1
•Updated Firmware Release Notes for Radioddity
DB25-D, Radioddity GD-88 and CPS
•Description of new features (GD-88 only)
•Minor Additions and updates
2022-10-26
V2.0
•Additional chapters and parameters for the
Radioddity GD-88
•Differentiation between Radioddity DB25-D and
Radioddity GD-88 wherever required
•Rearrangement of some chapters/parts
•Minor additions and corrections
2022-07-01
V1.1
•Added release notes for new firmware
•more precise description on how to use the
promiscuous mode
•replaced ‘band’ by ‘VFO’ to be more precise
when referring to one of the two VFOs (A and B)
•Minor additions and corrections
2022-03-11
V1.0
•Initial version which now has the original manual
(that comes with the radio) merged with our
previous Addendum resulting in this extended
manual for the Radioddity DB25-D
2022-02-01

Radioddity Extended manual for Radioddity DB25-D, DB40-D & GD-88 v3.0
© Radioddity 2023 page 17 of 252
3 Product safety and RF exposure for portable radios
Before using the radio, please read this manual carefully.
It contains important instructions for the safe and proper
use of the radio and operating instructions for
compliance with the limits of RF energy exposure in
accordance with applicable national and international
standards.
3.1 Notes on the use of the radio
Please read the following quick start guide, as failure to comply with these rules
can be dangerous or in violation of the law.
1. Observe local regulations before using this radio, as improper use may
violate the law.
2. Turn off the radio before approaching flammable or potentially explosive
atmospheres.
3. Do not charge or replace the battery in flammable or potentially explosive
atmospheres.
4. Turn the radio off before you come near any areas with explosives.
5. Do not use a radio whose antenna is damaged, as touching the damaged
antenna may result in injury.
6. Do not try to disassemble the radio; any maintenance work should be
carried out by qualified technicians.
7. To prevent electromagnetic interference issues, turn the radio off in
locations that have signs displaying similar instructions to ‘Do not use
wireless devices’or ‘Turn cell / mobile phones off’such as inside hospitals
and healthcare facilities.
8. Do not place the radio in the area of airbag deployment in vehicles so
equipped.
9. Do not store the radio in direct sunlight or hot areas.
10. When transmitting with the radio, keep the antenna at least 5cm away from
your body or face.
11. If the radio emits any smoke or burning smells, switch the radio off
immediately and disconnect it from the car’s battery and contact your
dealer.
12. Do not transmit for long periods as this may damage the radio or cause it to
become hot enough to cause injury.

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© Radioddity 2023 page 18 of 252
3.2 Maintenance and Cleaning
To ensure the best performance and prolong working life, please acquaint
yourself with the following for maintenance and cleaning.
3.2.1 Maintenance
1. Please do not scratch or puncture the device with hard or sharp object.
2. Please do not place the device under direct solar radiation or in an
environment which can corrode electronic circuits.
3. Please do not carry the device by its antenna, headset or programming cable.
4. Please make sure the Speaker-Microphone / K1 plug is covered when not in
use.
5. Opening or modifying the device will void any warranty.
6. Any firmware not intended to be used with the device will void any warranty.
3.2.2 Cleaning
1. Please clean your device regularly by using a dry clean cloth or soft brush to
wipe the dust off the surface.
2. The keypads, control knob and housing of the device may become dirty from
use. Please use nonwoven wipes to clean them. Do not use chemicals to clean
it such as detergent, alcohol, spray, or petroleum products, on the device
surface or printed labels. Chemicals can damage the housing, display, and
remove the printing on the labels. Before powering on the radio, please make
sure the device is dry completely.

Radioddity Extended manual for Radioddity DB25-D, DB40-D & GD-88 v3.0
© Radioddity 2023 page 19 of 252
4 What is in the box?
Thank you for choosing a Radioddity DB25-D, DB40-D or GD-88 radio. We
recommend that you first check the delivery contents listed in the following tables
and keep the packaging for later storage. If something is missing or damaged,
please contact your dealer immediately.
4.1 Bill of materials for Radioddity DB25-D
Item
Picture
Radioddity DB25-D
Mobile Radio
DC Power-cable
Speaker Mic
Mini GPS Antenna
Remark: active GPS-antennas are not
supported

Radioddity Extended manual for Radioddity DB25-D, DB40-D & GD-88 v3.0
© Radioddity 2023 page 20 of 252
Item
Picture
Mounting Bracket
Rack mounting Screws (2)
Programming Cable
Box manual