Radioddity GD77 Quick Start Guide by Joseph Stephen VK7JS 25 October 2021 To contact Joseph Stephen, email joestephen@skymesh.com.au Please note. Turn on word wrap to read this document in a text editor. This Guide assumes you are running the forked version of OpenGD77 produced by Joseph Stephen VK7JS and Jan Hegr OK1TE now called AccessibleGD77. It assumes the version dated 25 October 2021 or later. See the bottom of this document for links to the original and forked branches on Github. To install the CPS software required to communicate with your radio in order to upload Firmware, voice prompts and a code plug, please run the file called: OpenGD77CPSInstaller.exe in the root folder of this archive. To upload firmware, see the file called Firmware Upload.txt. To learn how to create and upload a code plug, see the file called Creating and Uploading a Code Plug.txt. Physical Description Front panel: Top third speaker grill. Middle third screen. Bottom third keypad. Top edge, left to right: Power/volume knob, Orange button, Antenna socket (female SMA) Keypad Description, left to right, top to bottom: Green/menu (ok), Up Arrow, Red/cancel. Left Arrow, Down Arrow, Right Arrow. 1, 2, 3, *. 4, 5, 6, 0. 7, 8, 9, #. Left side, top to bottom: PTT (Push to Talk.) SK1 (Side Key 1, also called Black button.) SK2 (Side Key 2, also called Blue Button.) Right Edge, top to bottom: Mic cover. To remove battery: 1. Place thumb in middle of top edge of speaker grill. 2. Place forefinger top middle of back edge (there is a recess). 3. Press forefinger toward thumb. 4. With other hand, slide battery downward (toward bottom of radio). Be careful because belt clip is attached to radio, not battery. To install the battery, just place it on the back of the radio behind the belt clip and push upward and it wil click in place. quick Overview. Once you install the firmware and voice prompts, the first time you turn the radio on it will be set to Voice Prompt mode level 3. The radio always boots up in Channel Mode (unless Scan on boot is enabled, which I do not recommend you enable). At this level, the radio will speak with the most verbosity. You may wish to reduce the verbosity once you are used to the various functions. To do this: 1. Press Green. 2. Arrow to Sound Options. 3. Press Green to select. 4. Press up arrow thrice to Voice Prompt. 5. Press Left Arrow once to choose level 2. 6. Press Green again to confirm. 7. Press and hold Red (cancel) until you exit the menus. You can adjust the relative voice volume in the event that the default volume of the voice is disproportionately louder than your received signal. The volume can be adjusted from the Sound Options menu using the option after Voice Prompts called Voice Volume. You can set the volume from 10%to 100% of the normal volume. You can also adjust the voice rate from the "Voice Rate" option in the Sound Options menu. You can choose from ten voice rates starting with the default rate of the installed voice pack file and increasing in rate in increments of 10%. On the GD77S, there is a Voice menu just prior to Options. Press Orange until you hear Voice, then use SK1 to increment volume or SK2 to increment speed. The values will wrap around after their maxima. This was more efficient than adding two different menu options. Note that whenever you go to the menus, the radio will take you to the last top level menu you selected. If you choose it, you will be taken to the last option in that menu you selected. In general, you select a menu item with Up and Down Arrow, and change its values with Left and Right Arrow. You go into a submenu with Green and you exit one level with Red. Press and hold Red to exit from any level back to the main channel or VFO screen as was in use prior to entering the menus. If you share the radio with a sighted person who may turn off voice prompts, you can always enable them by holding down # while powering on the radio. If they were off, they'll be set to voice prompt level 3. If they were already enabled, the level will not be changed. To repeat the last voice prompt spoken, press and release SK1. If you wish to hear a summary of the current channel or VFO settings, press and hold SK1 for more than half a second. The Orange button is used to go to the Channel or VFO Quick Menu. To change between Channel and VFO mode, pres the Red button from the channel or VFO screens. To change between VFO A and VFO B, press and hold the Red button for more than half a second when in VFO mode. (You can also press the orange button twice quickly from VFO mode.) You can save any menu option to a Quick Key so that you can invoke that function without having to find it in the menus. To do this: 1. Go to the menu/submenu or quick menu option. 2. Press and hold SK2 and press a digit from 0 to 9. 3. You'll hear a message: Set Quick Key x to y, where x is the number and y is the function name. 4. Press Green to confirm or Red to cancel. 5. Then, from the channel or VFO screen, to invoke that function, simply press and hold SK2 and press the digit. 6. Then when the radio announces the function, press Green to confirm or Red to cancel. 7. to clear a quick key, from the Channel or VFO screen, press and hold SK2 and the digit for more than half a second. 8. The radio will confirm the clear with a melody. 9. You can't assign a 2nd function to an assigned quick key unless you first clear it. You can now set default repeater offsets for the 2 m and 70 cm bands. The defaults are 600 kHz for 2 m and 5 mHz for 70 cm. The VHF offset can be set from 100 to 1000 kHz in steps of 100 kHz. The UHF offset can be set from 100 to 9900 kHz in steps of 100 kHz. Change these from the Options menu. From the VFO screen, in analog fm mode, you can then enter a frequency from the keypad and just hit # to cycle (and force the tx frequency) to the correct setting, i.e. add the appropriate offset, subtract the appropriate offset, or force to be the same (for simplex). The radio will announce plus, minus or none at voice prompt level 2 and higher. If you wish to set the offset for DMR, (since # in DMR mode allows the entry of TG, PC or contact, simply set the offset in FM mode then toggle to DMR mode using SK2+*. Note # works in the channel screen too for consistency, however it is advised to set your offset prior to saving a channel to avoid confusion. SK2 Latch. If you have trouble pressing and holding SK2 while pressing another key, you can enable the SK2 Latch function. To enable SK2 Latch: 1. Go to the menus with Green. 2. Arrow to Options and hit Green to select. 3. Arrow to SK2 Latch and hit right arrow to select the desired timeout time. A value of 1.5 to 2 seconds will allow you sufficient time to use the radio one handed. The timeout values are from 1 to 10 seconds in increments of half a second. 4. Press Green to confirm. 5. Press and hold Red until you exit the menus. There is also a PTT Latch feature which works similarly. When enabled, (from the Options Menu,) press PTT and release it and it will stay latched until you press and release it again or until the TX times out. The radio will now emit the same beep as the DMR start/stop beeps to indicate when TX has been enabled or disabled. Note that for PTT Latch to work, you must define a TOT (Timeout Timer) value either in the Options Menu (which affects all channels and VFO mode), or you can set it on an individual channel via the Channel Details Screen (SK2+Green from Channel or VFO screens). I recommend using the global TOT option in the Options Menu to avoid having to set the TOT value on every channel if you intend to use the PTT latch feature. Other Keypad Functions: * changes between time slots in DMR mode. A long hold of * in digital mode resets the timeslot to the channel's default timeslot. In FM mode it toggles between narrow and wide FM modes, i.e. between 25 kHz and 12.5 kHz. A long hold of * in analog mode will reset the channel's bandwidth to its default bandwidth. # in DMR mode allows you to cycle between Talk group entry, private call entry and contact. For the two entry modes, enter the ID using the keypad and hit Green to confirm. In contact mode Up and Down Arrow will select different contacts from the TGList. From Contacts mode, SK2+# will allow you to enter a different DMR ID into the radio. Confirm with Green for a temporary change, or SK2+Green to make the change permanent. Note that if you receive a DMR signal on a different talk group to your current talkgroup, pressing SK2 will change your current talk group to the received talk group. This is important, otherwise if you attempt to respond to the caller, they would not hear you. Note that if the DMR signal is from a different talk group to your current one, you are alerted with a double beep when the reception begins. In Analog mode, Left and Right Arrow control the squelch level for the current channel. SK2+Left and Right allow you to change the power level for the current channel between 50 MW and 5 W. SK2+Orange announces the current battery level. SK2+* toggles between FM and DMR mode. SK2+# goes to the Quick contacts list relevant for the current radio mode. Note that this is a cut-down version of the same contacts list you can access via the main menu. From this quick Contacts menu, Up and Down arrow will select a contact and Green will either dial the DTMF code (for an analog contact), or choose the contact if it is a digital contact. If you choose DTMF or DMR Contact List from the Contacts menu system, the Green button will bring up a submenu for creating, editing, deleting or selecting (dialing) the contact. You can also choose a dialer screen which allows you to enter digits to be dialled and then press Green to dial the entered digits. (This is the DTMF Entry screen). From the main Contacts menu, for DMR contacts, # will cycle the list between showing group call contacts, private call contacts and all call contacts. Scanning: Long hold Up Arrow to start scanning. While scanning, if the radio stops on a nuisance channel, you can hit Right arrow to add it to the nuisance list to skip it during that scan only. Press Red to stop scanning. Channel Details. If you press SK2+Green from the channel mode screen, you are taken to the Channel Details screen, which is the same screen you'd reach if you chose Channel Details from the main Menu. From this screen you can press Up and Down Arrow to move between fields, and Left and Right Arrow to change most values. If you wish to edit the channel name, the keypad may be used like a mobile phone keypad. Press a key to cycle between its letters, and then pause to enter the digit. the radio will announce the previewed character when you cycle, and the character inserted when you pause. You can backspace a character using SK2+Left arrow. In fact, when editing most fields, the following keys/functions are available: a. Arrowing left and right in the field will move to and speak the character; b. SK2+Left backspace and speak backspaced character; c. SK2+Right toggles between numeric and alphanumeric text entry in fields which may accept both numbers and letters. This means that when you are editing a DTMF contact, and you start off in numeric mode, where the majority of your entry is numbers, but then you wish to add a letter, you can press SK2+Right to switch to the keypad preview mode for entering alphanumerics. This works like the normal telephone alphanumeric keypad where multiple presses of a key cycles between letters and number and then a delay inserts that character into the field. You can then toggle back to numeric mode using the same key combination, SK2+Right. This works in DTMF fields and normal alphanumeric fields. It does not work in purely numeric fields by design. Note that when a field gains focus, it always starts off in the most appropriate mode. E.g. the DTMF code field always starts off in DTMF mode where numbers, * and # insert their number or symbol. Name fields always start off in alphanumeric mode where multiple presses of the keys cycle between letters and numbers. Frequency and DMR ID fields are always in numeric mode, where only numbers are valid and you can't toggle the input mode. d. Long hold Left, home (speak first character in field); e. Long hold Left+SK2 delete to start of field; f. Long hold Right, end (moves to last character and speaks it if it is not blank); g. Long hold Right+SK2 delete to end of field; h. Proper character insertion until the field is full at which point characters will be overwritten; i. Proper alphanumeric preview and speaking for alphanumeric fields; j. Simple digit input for numeric fields; k. Simple DTMF support for DTMF fields; l. SK1 will repeat the content of the edit field. PLEASE NOTE! If you wish to make the changes permanent, you must hit SK2+Green. If you simply hit Green, the changes will be saved only until you change the channel or reboot the radio. SK2+Green will write the changes to the Flash memory. The Red button can be used to cancel changes and exit the Channel Details screen. Creating a new channel. 1. Press Red from the Channel Screen to go to VFO. 2. Enter the receive frequency. 3. If you wish to enter a different transmit frequency, press SK2+Down Arrow to go to the transmit field (SK2+Up Arrow will go back to the Receive field). 4. Note that there is a Bind Transmit and Receive mode accessible from the Orange Quick Menu which sets the distance between the receive and transmit frequency to your current difference. Then, if you change the receive frequency, the transmit frequency will be changed by the same difference. To clarify , if you have set your receive and transmit frequencies such that there is a 600 KHz split, changing the receive frequency will maintain that split and change the transmit frequency accordingly. 5. Use the Channel Details screen (SK2+Green) from the VFO screen to set the tone and other parameters. 6. Finally, use the Orange button to go to the Quick Menu and select Copy VFO to new channel option and press Green to confirm. 7. go back to channel mode with Red button. 8. You can then use the Channel Details screen (SK2+Green) to edit the name of the channel. 9. Remember, if you wish to make the change permanent, use SK2+Green to save, do not just press Green. There is currently no way to delete a channel from the radio. The best you can do is reuse it by changing its details. Dual Watch. There is a Dual Watch mode available from both the channel and VFO screens. In VFO mode, the Dual Watch uses the details of VFO A and VFO B, so you need to set these to the frequencies, modes, and other parameters first before enabling the mode from the Orange button Quick Menu. This option is not a toggle. As soon as you press Green to confirm it after selecting it, it is on. To turn it off, press Red to cancel and go back to channel mode. The Channel Mode Dual Watch operates in a similar manner, however it allows you to change the channel on the fly. Firstly, from the channel screen, choose the channel you wish to monitor. Then, enable Dual Watch from the Orange button Quick Menu from the Channel Screen. Finally, you can then arrow to another channel. After a short delay, the Dual Watch will begin monitoring your watch channel and your current channel. If you cancel with Red or Green , you will be guaranteed to be on the channel you last arrowed to. If a received signal is detected, transmitting will be on that channel. While in Channel Dual Watch mode, the long hold of SK1 to read the channel summary will simply say the names of the two channels currently being monitored. After PTT is released, Dual Watch in channel mode will automatically be re-enabled unles you explicitly cancel it with the Red or Green buttons. (This is not the same in VFO mode, where the dual Watch is canceled when you hit PTT.) Priority Channel and Priority Watch You can now set a Priority channel in the Options Menu, or from the Channel Details screen (SK2+Green). If you set a priority channel, pressing and holding the Red button from the channel screen will toggle you between the priority channel and the last selected channel. If you set or unset the priority channel from the Channel Details Screen, like all changes made on that screen, the Green key only saves changes temporarily (until the radio is rebooted). If you wish to make changes permanent from that screen, press the SK2+Green button to save the changes permanently. You can also start a Priority Channel scan from the channel Quick Menu (orange button). This is essentially a dual channel watch using the priority channel as the watch channel. If you are performing a Priority Channel Scan, the Summary key long hold SK1 will indicate if it is a Priority Channel Scan or standard dual watch. You can also enable a Priority Channel Scan on boot. Set the Scan On Boot Options Menyu item to Priority Channel Scan. (The Scan On Boot option has three values in our firmware, Off, on (normal Scan) and Priority Channel Scan). Note as of 22 June 2021, the priority channel may now be in a different zone. If you switch to the priority channel using long hold Red from the current zone when the priority channel is not in the current zone, the summary will not announce the number of the priority channel since it doesn't exist in the current zone, and its number relative to the AllChannels zone is irrelevant to the current zone. DTMF Latch When transmitting a DTMF string, if not using the contacts list, this radio has a latch similar to the Kenwood TH-D74a. How it works is as follows: 1. You press PTT and begin dialing the DTMF code. 2. You can let go of PTT and continue dialing the DTMF digits. 3. They'll continue to be transmitted until you leave a long enough pause after the last digit. After about 1.5 seconds, the latch will be released and you'll be back in receive mode. If you do not like this feature, or wish to change the length of the timeout, you can do so via the DTMF Latch option in the Options Menu. Note that if you need to dial a 1750 Hz tone, press SK2+ptt. Last Heard screen. There is now a new submenu accessible from the Last Heard screen, thanks to OK1TE. If you hit the green key when an item is selected in the Last Heard list, you will now be presented with a submenu with two items containing the ID of the individual who last spoke, and the talk group on which they were talking. If you choose the ID of the individual, you will invoke a private call with the selected last heard station. If you choose the talk group, it will be as if you hit SK2 in reception mode, i.e. your TX will be set to the Talk Group of the last heard station. AutoZones feature. An AutoZone is a pseudo zone created on the fly based on channelized frequencies calculated via a formula with heuristics applied. I.e. these zones do not take up any memory for the channel data. An Auto Zones menu has been added to the main menu Use up and down to select an AutoZone to enable or disable. Enable or disable an AutoZone using the left and right arrows. The following autoZones are available: * Mrn (The international VHF Marine band), * UHF CB (The Australian 80 channel UHF cb band), * GMRS (General Mobile Radio Service) band, * FRS (Family Radio Service) band, * MURS (Multi-use Radio Service) band, * NOAA ()(National Oceanic and Atmospheric Administration) band, * PMR446 (Personal Mobile Radio) band, and, * US Rail (US Railway band). When you enable an AutoZone, it is added to the zones through which you may cycle using SK2+up/down, or via the Zones menu. When disabled, the AutoZone will disappear from the zones through which you may cycle. When an AutoZone is active, the rules for that band are adhered to, for example: In the Australian UHF cb band, channels 22, 23, 61, 62 and 63 are receive only, and duplex (hash key) may only be enabled on channels 1 through 8 and 41 through 48. The correct repeater offset (750 kHz) is automatically applied when duplex is toggled. When NOAA or US Rail are active, all channels are receive only. When GMRS is active, duplex (hash key) may be used on channels 15 through 22 and the correct repeater offset is applied. all other channels only allow simplex operation. For the marine band, use # to cycle between simplex and deuplex for supported channels. While you can change things like CTCSS, the values cannot be saved permanently since the channels don't really exist. Thus, you may only change these settings temporarily via the Channel Details screen. You may use long hold Red to jump to that band's priority channel if one is defined (e.g. ch5 for UHF CB, and ch16 for Marine). Currently, Priority Channel scan does not work in autoZones. Please note that transmission withihn AutoZones is subject to the Band Limits menu option in the main Options Menu, as well as the restrictions of the specific AutoZone. If you think you should be able to transmit and can't, check that your Band Limits options Menu value is appropriately set. If set to CPS, make sure you have set the correct band limits in your Ccodeplug. It goes without saying that you must hold the relevant license for transmission in any of these bands not governed by a class licence. Autozones support for the GD77S Autozones are also now available on the GD77S. 1. Cycle to the AutoZones mode with the Orange key. 2. Use SK1 to cycle through the names of the AutoZones and use SK2 to enable or disable an AutoZone. 3. Once you've enabled or disabled all the autozones that you want, you can then choose them from the Zones mode. 4. If an AutoZone has more than 16 channels, use long hold SK2 to select the next channel bank. Each time you long hold SK2, you'll move up by 16 channels. (This is because the GD77S has 16 physical channel positions.). Once you've reached the last bank, long hold SK2 will return you to bank 0. 5. If an AutoZone has duplex available for a particular channel, such as a UHF CB channel, an extra long hold of SK1 will toggle between simplex and duplex mode. (You'll hear none for simplex and either plus or minus for a plus or minus repeater offset as defined by the AutoZone). Resetting the radio's settings to default. If you need to reset the radio's settings to their default values, power off the radio, hold sk2, then power on the radio. You'll hear "Update Settings". You'll then need to reset all of your favorite options. Occasionally, due to changes in the firmware, updating the firmware may force a settings reset. If this happens, you'll hear the message "Update Settings" and you will need to reset your favorite settings in the various menus. GD77S The GD77S model does not have a physical keypad. Generally, function categories are selected by pressing the Orange button next to the channel selector knob, which cycles through various option categories, and SK1 and SK2 are used for selecting values for the various options. You can hold SK1 and press Orange to cycle backward through the functions. Long hold SK1 on its own repeats the current channel details. Extra long hold SK1 in an autozone with a repeater will toggle between simplex and duplex mode. Long hold SK2 switches the TX talkgroup to the RX talkgroup during DMR reception. In an autozone with more than 16 channels, long hold SK2 will move up to the next bank of 16 channels. Long hold Orange announces the battery level. Please note: To toggle the band limits between on and off on the GD77S, hold down SK1+PTT while powering on the radio. Virtual Keypad mode for GD77S. (This is not relevant for the other models as they have keypads.) 1. The GD77S now has a virtual keypad mode. Enter it like other modes, by pressing Orange until you hear Keypad. 1.1. Once in keypad mode, the rotary knob is no longer used for channel selection but number and letter selection. 1.2. Read the current buffer with long hold sk1. 1.3. Add the currently selected digit or letter to the buffer with short press sk1. 1.4. Backspace the last char with short press sk2. 1.5. Clear the buffer with long hold sk2. You'll hear a confirmation beep. 1.6. If you hit ptt, the buffer is sent as dtmf tones (if the radio is in analog mode). 1.7. If you press long hold of orange, the buffer is interpreted as either a command (see below) or a frequency, or frequency pair (rx tx) and the radio is set to that frequency. 1.7.1. The frequency entry is flexible. If it is simplex, you can enter as few digits as you need to get the correct frequency, e.g. 147 for 147 mHz. 1.7.2. If you wish to enter both rx and tx, so long as the rx starts at position 1 and the tx at position 9, i.e. first 8 for rx and 2nd 8 for tx, it should work. The following will work: 14700000146400 To set rx to 147 and tx to 146400. Or, 1470000014640000 i.e. rest filled with 0s. Thus, if you wish to set frequency then dial a dtmf string, first set the frequency, then long hold sk2 to clear and then enter the dtmf code, then ptt. Note, even if you exit the mode with short ppress orange, then go back in, the buffer is preserved. 2. You can now enter a special command string followed by long hold orange to change radio functions. Commands which are supported by the virtual keypad include: 2 .1. * followed by long hold orange will toggle radio mode. Note, since the buffer is not automatically reset, pressing long hold orange again will cycle the mode back again. 2.2. Normally, the Power mode on the GD77S will adjust the channel or master power but there is no way of either clearing a channel's custom power or setting it if it is from the master. Thus, I've added a new Keypad mode command ** number, followed by long hold Orange, to do that. 2.2.1. **0 will clear the channel's custom power, forcing it back to the master value. 2.2.2. **1 through **10 will set the power to levels 1 through 10, where 1 is 50MW, 9 is 5W etc. 2.2.3. **50, **250, **500, **750, **1000, **2000, **3000, **4000, **5000, or **5100 etc will set the channel's custom power level to the nearest milliwat level supported by the radio. 2.2.4. The channel summary on long hold sk1 will now announce the channel's power level. If it is from the master value, the "from master" announcement will be spoken after the power level. 2.3. # folowed by long hold orange will toggle time slot in DMR mode. 2.4. # followed by digits followed by long hold orange will set the radio to the specified talkgroup if in DMR mode. 2.5. ## followed by digits followed by long hold orange will start a private call with the user with the specified DMR ID. 2.6. ### followed by ID followed by long hold orange will set the radio's User DMR ID. Note this is saved to flash memory so power cycling the radio will maintain this user ID. 2.7. B followed by long hold orange will toggle radio bandwidth in FM mode. Note, since the buffer is not automatically reset, pressing long hold orange again will cycle the bandwidth back again. 2.8. C followed by digits followed by long hold orange will set a CTCSS code, e.g. C854 would enter the code 85.4 hz tx tone. Add a * to set the code for rx also, e.g. C854* would set rx and tx tone to 85.4 hz. 2.9. D followed by digits followed by long hold orange to enter a DCS code, e.g. D31 would enter the DCS code 031 tx DCS code. Likewise adding a * after the digits will set rx dcs also. Note to clear a CTCSS or DCS code, enter c followed by long hold orange. Remember, if you wish to enter a new command, don't forget to clear the buffer first with long hold sk2. 2.10. Command A or A1 through A16 followed by long hold orange, recall VFO, copy VFO to channels 1 through 16 in the current zone. Whenever you go to keypad mode, whatever channel was last active is still active. If you then change the radio mode, enter a frequency, tone, set mode etc, whenever you press long hold orange to action a command, all of the current VFO settings are automatically saved. You can then go and do other things, change channels etc, even turn off the radio. When you go back to keypad mode, as usual, whatever was last active is still active, however, you can recall the prior saved VFO settings using the command a followed by long hold orange. This makes the saved VFO settings active again. If you wish to make the VFO settings more permanent, you can then save these settings to channel 1 through 16 in the current zone using the command a1 through a16 followed by long hold orange. All of the VFO settings are saved to the specified channel in the current zone. The overwritten channel will have its number as its name. e.g. channel 1, channel 16, etc. Of course you cannot save to an AutoZone channel. 2.11. If you just want to copy a channel to the VFO without issuing any command to change the current channel's settings, after locating the channel you wish to copy, activate Keypad mode, then immediately press long hold orange with an empty keypad buffer. The current channel will be copied to the VFO. If you previously visited keypad mode, remember to clear the keypad buffer with long hold sk2 prior to pressing long hold orange. There is also now a shortcut to return to Channel Mode from any mode on the GD77S. If you rotate the channel knob from any mode (other than Keypad mode), the GD77S will immediately return to Channel Mode. For example, if you hit the orange key to change to say Power Mode, a quick flick of the rotary knob up and back will return the radio to Channel Mode without having to press the Orange key multiple times to get back to Channel Mode. There is now a new Options mode on the GD77S. All global modes have been moved from the Orange function cycle to this new mode. In this new mode, similar to the Keypad mode, the channel knob is used to select the option and SK1 and SK2 are used to change the option's values. Long hold SK1 repeats the current option and its value, and long hold SK2 resets the option to its factory default. This Mode contains the following options: * Master Power, * FM Mic Gain, * DMR Mic Gain, * FM Beep, * DMR Beep, * Band Limits, * VHF master Squelch, * 220 MHz master Squelch, * UHF master Squelch, * TOT master (needed for PTT latch), * PTT Latch, * Eco Level (5 levels of battery save mode), * Vox Threshold, * Vox Tail, * AutoZone, * Firmware Info. Vox support has been added to the GD77S. Choose it using the Orange function key. It is after Keypad in the list. Turn on and off with SK1 and SK2. Set threshold and tail from Options menu. PTT Latch support has been added to the GD77S. Enable TOT (timeout timer) and PTT Latch from the Options mode. Note that PTT Latch will not work without a Timeout defined. This is by design. Also, when PTT Latch is enabled, like on the GD77, beeps are automatically enabled when you press and release PTT so you know when transmission has started and stopped. User Information screen A new User Information option has been added to the Main Menu. This allows the user to set their callsign, DMR ID, and two lines of boot screen text. The DMR ID previously being the only field of them all which could be set without the CPS software. This Boot (or Splash screen) text will only be read at voice prompt level 3. New RSSI screen Audio Indicator for DMR signal reception. Added continuous tone feedback while SK1 is held down. Works for DMR only. Deleting a Channel from the radio: You can now delete a channel from the current zone or from all zones. Choose one of the delete options from the Orange button Quick menu on the Channel Screen. Delete from zone will delete the current channel from the current zone. Note that you'll get an error beep if you try and delete a channel from the All Channels zone as it is not a true zone. You also can't delete a channel from an AutoZone. Delete from All Zones will delete the current channel from every zone on the radio , i.e. delete the channel completely from the codeplug. Reordering Channels in a zone: Choose "Reorder Channels" from the Quick Menu (orange button). When in reorder mode, up and down select the channel to move, and left and right move that channel to the previous or next slot in the zone, swapping it with the channel at the previous or next position. Press and hold left or right to move the current channel to the first or last position in the zone. Press red or green keys to exit the reorder mode and return left and right to normal channel screen operation. Note: this does not work in the All channels zone or any AutoZone as these are not real zones. Note for more detailed information about each of the menu options, please consult the manual, OpenGD77_User_Guide.pdf. It is out of date in some areas, so where there is a conflict, this AccessibleGuideGD77.txt file is more up-to-date. Links: The most recent version of the source of the accessible fork of OpenGD77 can be found at: https://github.com/HegrJan/BlindGD77 The original version can be found at: https://www.opengd77.com/downloads/releases/R2021052901/sources_and_tools/ The official Radioddity firmware (required to upload the OpenGD77 firmware) can be found at http://radioddity.s3.amazonaws.com/2021-01-26_GD-77_CPS_%26_Firmware_Changelog_Ham_Version.zip Ian Spencer's great tutorial in MP3 and PDF format can be found at http://www.spencerweb.net/Downloads/OpenGD77/opengd77.html End of guide.