[1000mp] hum on ft 1000mp mark v // internal power supply

[DL3HBY]

Hello all - ich look for a mod for the power supply - i have
some hum on tx (without mic too) If i use the external power
supply the hum is gone. So - i think it comes from the build in
power supply. My problem - i can`t find any info on the support sites.

any idea ???

best regards
ingmar - dl3hby