I’ve made a few small changes to the OpenGD77 firmware and uploaded a new version to the daily builds folder on Github (see the link below)
- There is a fix to prevent totally incorrect power levels being shown in Hotspot mode, if the PA drive setting in the utility menu was set to values below 775.This was being caused when the calculated power in mW was a negative value.
I have changed the Hotspot version that is displayed in PiStar to v0.0.51
- I’ve changed the beep volume setting to be adjustable in 3dB steps rather than the arbitrary percentage values that resulted from the way I was reducing the audio volume by dividing the amplitude by integers between 1 and 10.
0dB should be approximately the same volume as the official firmware, 3dB will be twice as loud and 6wB will be 4 times as loud.
The minimum value is -24db which is barely audible above the physical click of the buttons.
I have also changed the pitch of the key beep to be roughly the same as the pitch in the official firmware.
Some users will probably need to adjust their beep volume settings again in the Utilities menu.
- I have also prevented the radio starting to transmit if the PTT is pressed during boot-up or during shutdown.
As usual the firmware can be downloaded from
Over the next few weeks I’m going to start investigating how to implement DMR Tier 2.
Colin G4ELM did some initial investigations into what needed to be added to, or changed in the firmware in order to support Tier 2, but discovered that a partial re-write of the existing Tier 1 functionality would be needed before any work on Tier 2 could commence.
I’ve also noticed that the DMR end of transmission appears to be slightly wrong, because there is an additional audio tone after the DMR 4FSK has finished. This seems to indicate the the PA and Tx is being held on after the DMR DSP chip has completely finished sending all the necessary DMR data (Link terminator frames), so I will also be attempting to fix that small problem.
I may still occasionally add enhancements just as light relief from the Tier 2 work, and I will release bug fixes when necessary, but my primary focus will be on DMR Tier 2.