DM-1801 Possibly noise from the backlight PWM control on both Tx and Rx audio

Anything specifically related to the DM-1801 version of the firmware
Post Reply
VK3KYY
Posts: 2709
Joined: Sat Nov 16, 2019 3:25 am
Location: Melbourne, Australia
Contact:

DM-1801 Possibly noise from the backlight PWM control on both Tx and Rx audio

Post by VK3KYY » Sat Mar 07, 2020 11:18 pm

The Baofeng seems to not have such good supply decoupling, and the PWM for the backlight intensity control seems to be audible on some radios.

I've tied changing the frequency of the PWM, from 10kHz to 100kHz but apparently it made no difference, so I'll need to change the firmware, so that its possible to enable or disable the PWM on the backlight. But backlight dimming will not be possible for those people who experience this noise, unless they add extra supply decoupling to their radio hardware to solve this design problem

Post Reply