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Help with Feedback or Radio Noise ?? with my K3

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Irwin KD3TB

Help with Feedback or Radio Noise ?? with my K3

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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Irwin KD3TB

Re: Help with Feedback or Radio Noise ?? with my K3

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" <[hidden email]> 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.

> 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
>
> ______________________________________________________________
> 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

______________________________________________________________
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

DaleJ

Re: [Elecraft_K3] RE: Help with Feedback or Radio Noise ?? with my K3

If you tap on the cabinet do you hear it in the headphones?

I wonder if you have something microphonic in the rig, like a ceramic capacitor or something else.

Dale k9vuj

On 29, Sep 2010, at 9:58, KD3TB wrote:

> 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" <[hidden email]> 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
>>
>> ______________________________________________________________
>> 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
>
>
>
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