[Elecraft] Help with Feedback or Radio Noise ?? with my K3

[KD3TB]

I thank everyone for their suggestions regarding the Line in settings. I
have tried the following and still find the back ground noise Monitor on SSB
(Microphone disconnected).

MIC SEL - rFL, fPL and Line In settings - still hear fan noise on keying
MIC+LIN - On or Off makes no difference. 

I even pulled the Lin in and Lin out plugs to the K3 - still hear fan noise
on keying.

I do not think it is coming from the Lin In plug? A future firmware option
maybe to turn off the Lin in when keying the mic even though this would not
solve my problem. 

Please keep the suggestions coming.

Thanks, Irwin - KD3TB


On Sep 28, 2010, at 12:20 PM, "KD3TB" <idarack at gmail.com> wrote:

> I am trying to find and resolve the source of speaker/headset noise I am
> getting with my K3. The noise sounds like a continuous fan noise in the
> background. I think the noise is showing up in the Monitor circuitry ? Any
> suggestions would be appreciated.
> 
> 
> 
> I discovered a high noise level  coming from the K3 when I key the
> transmitter in SSB.  I am not sure if it was there before, as I rarely use
> the Monitor function. It occurs with/without any headset connected
(appears
> in the radio speakers too) and with/without any microphone connected.  I
> have also tried a  number of different microphones and headsets.  I get
the
> noise in both Test Mode or Normal transmit mode. I also get the noise when
I
> transmit into a dummy load.   I am using a Monitor Level of around 8 to
hear
> the noise. Obviously it gets loader with a higher Monitor settings.
> 
> 
> 
> Here are my settings and what I have tried so far:
> 
> 
> 
> MIC SEL  - High or Low makes no difference; Bias on or off (should be off
> for my microphones) makes no difference.
> 
> TX GATE - On or Off and tried different settings - No difference, I even
> hear the noise at a setting of 25.   I have set it to On with a setting at
> 09
> 
> No difference with Pre-Amp or Noise Blank on or off.
> 
> 
> 
> I have played around with the MIC and COMP setting with no Mic connected.
As
> I raise the MIC and COMP settings, the noise gets louder.
> 
> 
> 
> Finally I set the radio to:
> 
> MIC - set to 20
> 
> COMP - set to 20
> 
> 
> 
> I have the latest Firmware with both my K3 and P3. The K3IO Buffer Kit Mod
> for the P3 was done.
> 
> 
> 
> Any suggestions on setting(s) that I may be missing would be appreciated.
> 
> 
> 
> 
> 
> Thank you, Irwin KD3TB
> 
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