OpenGD77

This has been asked before.
Unfortunately the answer is no.

This is because the MD750 uses the HRC7000 chip for which there is very little documentation and no publicly available toolchain.

Colin G4EML

You are correct, at the moment there is no key assigned to the manual backlight. So it can't be used.

Colin G4EML

Hello Gav, Welcome. The firmware was originally written for the buttons and keys available on a handheld, so when converting to the MD9600 mobile a few changes were needed. Everything should work but the key sequences used may be slightly different. The user guide doesn't yet accurately reflect the ...

OK, I was quoting from memory!

Post edited with the correct keys.

Colin

We had to remap some features due to missing keys.

Up arrow = A
SK1 + Up arrow = B
Down arrow = C
SK1 + Down arrow = D


Colin G4EML

If you are trying to load new firmware you must put the radio into bootloader mode.
Hold down the top two side keys when turning on the radio.

Colin.

The source code is available with the stable releases at

downloads/releases/

Only the GD77 code has been released. The code for the newer radios is not yet stable.

Open GD77 does not transmit on both timeslots at the same time. It does however only support the DMR standard Direct mode for simplex. Direct mode transmits with a 50% 'Single Slot' duty cycle but the transmission does not contain any information regarding timeslot. There is no master timing referen...

As Roger says, at the moment we cannot send CTCSS and DTMF at the same time on the STM32 based radios. This is a limitation of the HRC6000 Chip which we are using to generate both systems, it can only do one at at time. When DTMF is sent the CTCSS is paused for the duration of the digits. We maybe a...

ON4NSP, Your problem is not the same as described by K04AXL. Your issue is with receive, his with transmit. Are you certain the repeater is sending the 131.8Hz tone? Your description is what I would expect if your radio was set for 131.8 RX CTCSS but the repeater was not sending the tone or was send...