[Elecraft] K3 Mic noise while monitoring eq.

[Iain Haywood]

Hello,

While trying to adjust the mic equalisation I am getting a continual low 
level high end electrical noise, like whistle or very slight feedback 
through while monitoring on headphones or speaker.

With more compression it brings it out more obviously but it is there 
with no compression.
It is there even on low mic gain but much less.

It even persists even with no microphone, data lead or cables plugged in.

I have unplugged EVERYTHING apart from the power, put monitor speaker 
on, and PTT and it is there. At zero mic gain no noise but it rises as 
the mic gain does.

If I cut the extreme high end it goes a little but I need some high end 
boost for my mic.

Its not to horrendous, its only just perceptible I shouldn't think it 
wouldn’t carry through to audio with a 2.7Khz bandwidth but I cant be sure.

Can I just assume its just internal noise being picked up on the monitor 
amp or do I have to worry about my TX audio quality?

Has anyone else noticed this effect? Do I have duff mic pre-amp 
shielding somewhere?



Iain