K3 Mic noise while monitoring eq.

[Iain G4SGX]

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

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[John Lemay]

Iain

This rings a bell with me, but it's way back in the past so my memory could
be wrong ........... Do you have MIC+LIN IN turned on ? (sorry I'm not near
the rig at present so the exact terminology may be incorrect). If so try
turning it to just MIC on and see if the issue is solved.

John G4ZTR


-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Iain Haywood
Sent: 23 March 2013 19:04
To: [hidden email]
Subject: [Elecraft] K3 Mic noise while monitoring eq.

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

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Help: http://mailman.qth.net/mmfaq.htm
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[Iain G4SGX]

Hi,

No I'm afraid not.

Mic only selected.

Iain




-----------------------------

Iain

This rings a bell with me, but it's way back in the past so my memory could
be wrong ........... Do you have MIC+LIN IN turned on ? (sorry I'm not near
the rig at present so the exact terminology may be incorrect). If so try
turning it to just MIC on and see if the issue is solved.

John G4ZTR


-----Original Message-----
From:[hidden email]
[mailto:[hidden email]] On Behalf Of Iain Haywood
Sent: 23 March 2013 19:04
To:[hidden email]
Subject: [Elecraft] K3 Mic noise while monitoring eq.

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

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html