Update 6th March Version 2

[VK3KYY]

Yet another update today !

https://github.com/rogerclarkmelbourne/ ... latest.sgl

Changes to this version are as follows.

• The firmware makes a copy of the calibration table and saves it at address 0xF000 in Flash. This change was made so that the DM-1801 and GD-77 calibration table can be at the same address and only one CPS is then needed for both radios. (Note the DM-1801 version also has to copy the calibration to 0xF000 but its original location is different from the GD-77 calibration table
• Speed of access to the Flash memory has been improved by the removal of some redundant code, which kept checking if the Flash was busy
• Improve boot speed, by removal of the 500mS delay at the start of the code, which no longer seemed to be needed. (You probably won't notice this change)
• Updated translations for some languages, for the new Sound Options menu
• Scan option in the VFO quick menu can now be activated by pressing the Orange button again (like on the Channel screen)
• Location of the Scan option has been moved to make it easier to get to in the VFO quick menu (and on the DM-1801 the VFO quick menu Scan option is in the same location in the menu as on the Channel screen, because the DM-1801 does not need the option to change VFO, as it has a separate button "A/B" for this.
• Screen backlight PWM frequency has been increased from 2.4kHz to 10kHz, because on the DM-1801 a 2.4kHz tone could be heard through the speaker when the backlight was on. (I don't recall hearing this on the GD-77, but it may cause a slight improvement on the GD-77 even if the sound was at a sub-audible level)

Note.

Because of the change to keep the calibration table for all radios in the same location, I've updated the CPS to handle this

https://github.com/rogerclarkmelbourne/ ... taller.exe

[F1CXG]

Thanks ..... again, Roger

[m1dyp]

thank you

[IK8JHL]

[*] Scan option in the VFO quick menu can now be activated by pressing the Orange button again (like on the Channel screen)

this does not work for me ... pressing the orange button always gives me the VFO A / B

[f6fzo]

Merci

[W1AEX]

Hi Roger,

I installed the 3_6_2020 firmware release with the new CPS into one of my GD-77 radios and it went in fine. Before this version, I could hear a very soft digital noise in the background during the playback when doing a Parrot check. I don't hear a trace of that with this version so perhaps it's related to the change in the PWM frequency utilized by the backlight?

I did have to add an exception to my AVAST anti-virus when installing the new CPS. As it has previously done, it was false-flagging the installer as an adware executable and sending the file to the quarantine dungeon whenever I tried executing it. I uploaded the installer to the online VirusTotal scanner and Avast plus 3 other anti-virus products whined about adware but all the rest (+30 antivirus products) indicated it was clean. As you have previously stated, there is not much you can do about that!

Thanks for the update, it's working fine here!

73, Rob W1AEX

[VK3KYY]

Rob

I had not noticed the 2.4kHz tone myself, but some radios appear to have more audio noise than others.

You could try loading the previous version, and then listen to hear if the 2.4kHz tone is audible if you specifically listen for it.

I guess you could try recording the audio into a a computer , of a FM or DMR signal with no modulation and run it through Audacity and use the spectrum plot to look for the 2.4kHz.


There is no additional load on the CPU by changing this to 10kHz, and I could use a higher frequency, but I didn’t want to go too high, e.g 100kHz or more, in case the harmonics started to interfere with the master clock oscillator, which I think is around 20MHz

[VK3KYY]

[*] Scan option in the VFO quick menu can now be activated by pressing the Orange button again (like on the Channel screen)

this does not work for me ... pressing the orange button always gives me the VFO A / B

You still need to select the Scan option first, but you can then press the Orange or the Green to start the scan.

This change is more relevant to the DM-1801, which does not have the VFO A / B option, because it has a physical button for this function

[kt4lh]

Is there a way to back up the calibration, or does that happen as part of the codeplug?

[VK3KYY]

Is there a way to back up the calibration, or does that happen as part of the codeplug?

Its part of the CPS.

But make sure you download the latest CPS to match this firmware, otherwise uploading the firmware will do nothing as the old CPS uploads to the old calibration storage address in the Flash memory