Posted on: 8th December 2012
Modification on the HM-133 microphone.
As i discovered some minor Audio probelems on the output on the IC-2820. It’s kind of high and does not have any low or mid in the audio trans missing.
I searched on the internet and found some options. I decided to take the option what can be done easy. Putting a 1,5uF condenser on the C30. Also making an better way for the audio to the microphone.
You will see pictures before and after the modification.
Normal front side Modification with the Condenser 1,5uF
Mike input before the mod Mic after the mod
The two shematic diagrams where to put the condenser
After all is set just edited the menu of your IC-2820
MENU –> SET MODE –> MIC SENS LEVEL – HIGH – et ALC – OFF
Hope you will find this modification helpfull on your tranciever.