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noise on SSB modulation

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DK5EW

noise on SSB modulation

Hi all,
I use at my K3 a HEIL PRO SET ELITE "IC", I had this as I use it at my
old ICOM IC-275H as well.
Now I recognised that I have a small noise on modulation like a fan that
gives me some power output when I just push PTT.
OK I have in my shack 2 additional fans for cooling the PA so I switched
them of. The noise is lower but still there.
and there are no other noise sources. So my setting for the HEIL headset
are:
- MIC: 25
- CMR: 25
- MIC SEL: RP + HIGH BIAS
- MIC+LIN: OFF
Do you have any idea if I can change setting to cancel that noise ?
I can not believe that the microphone is that sensitive to pick up all
little noises around.
best regards Erwin/DK5EW

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Buck - k4ia

Re: noise on SSB modulation

It is not a fan, it is RF or other noise getting back into the mic
circuit. I had the same problem. Check the two mods on the Elecraft K3
Enhancements and Application Notes page. Look for Older K3 Mods >
"Front Panel Microphone" and "Improving the Immunity of the real panel
RS232 and audio connectors" to see if they apply to your rig's serial
number. Do both to solve your problem.

Buck
k4ia
K3 # 101

On 9/23/2011 6:39 AM, DK5EW wrote:

> Hi all,
> I use at my K3 a HEIL PRO SET ELITE "IC", I had this as I use it at my
> old ICOM IC-275H as well.
> Now I recognised that I have a small noise on modulation like a fan that
> gives me some power output when I just push PTT.
> OK I have in my shack 2 additional fans for cooling the PA so I switched
> them of. The noise is lower but still there.
> and there are no other noise sources. So my setting for the HEIL headset
> are:
> - MIC: 25
> - CMR: 25
> - MIC SEL: RP + HIGH BIAS
> - MIC+LIN: OFF
> Do you have any idea if I can change setting to cancel that noise ?
> I can not believe that the microphone is that sensitive to pick up all
> little noises around.
> best regards Erwin/DK5EW
>
>
>
> -----
> eMail ist virenfrei.
> Von AVG überprüft - www.avg.de
> Version: 10.0.1410 / Virendatenbank: 1520/3913 - Ausgabedatum: 22.09.2011
> ______________________________________________________________
> 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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DK5EW

Re: noise on SSB modulation

Dear Buck,
thanks for your tips but I'm not sure if I have to do any mor because my
K3 is brand new !
It came 05.September 2011 and has serial 5776.
73's Erwin/DK5EW

Am 23.09.2011 13:24, schrieb Buck k4ia:

> It is not a fan, it is RF or other noise getting back into the mic
> circuit. I had the same problem. Check the two mods on the Elecraft K3
> Enhancements and Application Notes page. Look for Older K3 Mods>
> "Front Panel Microphone" and "Improving the Immunity of the real panel
> RS232 and audio connectors" to see if they apply to your rig's serial
> number. Do both to solve your problem.
>
>
> Buck
> k4ia
> K3 # 101
>
> On 9/23/2011 6:39 AM, DK5EW wrote:
>> Hi all,
>> I use at my K3 a HEIL PRO SET ELITE "IC", I had this as I use it at my
>> old ICOM IC-275H as well.
>> Now I recognised that I have a small noise on modulation like a fan that
>> gives me some power output when I just push PTT.
>> OK I have in my shack 2 additional fans for cooling the PA so I switched
>> them of. The noise is lower but still there.
>> and there are no other noise sources. So my setting for the HEIL headset
>> are:
>> - MIC: 25
>> - CMR: 25
>> - MIC SEL: RP + HIGH BIAS
>> - MIC+LIN: OFF
>> Do you have any idea if I can change setting to cancel that noise ?
>> I can not believe that the microphone is that sensitive to pick up all
>> little noises around.
>> best regards Erwin/DK5EW
>>
>>
>>
>> -----
>> eMail ist virenfrei.
>> Von AVG überprüft - www.avg.de
>> Version: 10.0.1410 / Virendatenbank: 1520/3913 - Ausgabedatum: 22.09.2011
>> ______________________________________________________________
>> 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
>
>
>

-----
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Buck - k4ia

Re: noise on SSB modulation

Try reducing your compression setting. I get a noise at 25 also.

Buck
k4ia
K3 # 101

On 9/23/2011 7:33 AM, DK5EW wrote:

> Dear Buck,
> thanks for your tips but I'm not sure if I have to do any mor because my
> K3 is brand new !
> It came 05.September 2011 and has serial 5776.
> 73's Erwin/DK5EW
>
> Am 23.09.2011 13:24, schrieb Buck k4ia:
>> It is not a fan, it is RF or other noise getting back into the mic
>> circuit. I had the same problem. Check the two mods on the Elecraft K3
>> Enhancements and Application Notes page. Look for Older K3 Mods>
>> "Front Panel Microphone" and "Improving the Immunity of the real panel
>> RS232 and audio connectors" to see if they apply to your rig's serial
>> number. Do both to solve your problem.
>>
>>
>> Buck
>> k4ia
>> K3 # 101
>>
>> On 9/23/2011 6:39 AM, DK5EW wrote:
>>> Hi all,
>>> I use at my K3 a HEIL PRO SET ELITE "IC", I had this as I use it at my
>>> old ICOM IC-275H as well.
>>> Now I recognised that I have a small noise on modulation like a fan that
>>> gives me some power output when I just push PTT.
>>> OK I have in my shack 2 additional fans for cooling the PA so I switched
>>> them of. The noise is lower but still there.
>>> and there are no other noise sources. So my setting for the HEIL headset
>>> are:
>>> - MIC: 25
>>> - CMR: 25
>>> - MIC SEL: RP + HIGH BIAS
>>> - MIC+LIN: OFF
>>> Do you have any idea if I can change setting to cancel that noise ?
>>> I can not believe that the microphone is that sensitive to pick up all
>>> little noises around.
>>> best regards Erwin/DK5EW
>>>
>>>
>>>
>>> -----
>>> eMail ist virenfrei.
>>> Von AVG überprüft -www.avg.de
>>> Version: 10.0.1410 / Virendatenbank: 1520/3913 - Ausgabedatum: 22.09.2011
>>> ______________________________________________________________
>>> 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
>>
>>
>>
> ------------------------------------------------------------------------
>
> eMail ist virenfrei.
> Von AVG überprüft - www.avg.de <http://www.avg.de>
> Version: 10.0.1410 / Virendatenbank: 1520/3913 - Ausgabedatum: 22.09.2011
>

David Gilbert

Re: noise on SSB modulation

In reply to this post by DK5EW

If you are using any kind of rig control with your computer (and
therefore have a shield connection between the K3 and the computer, such
as via an RS-232 cable), make sure the chassis of your K3 is securely
bonded to the chassis of the computer with a very short length of large
gauge wire or section of shielded braid. I had to go down to less than
a foot of RG-8 shielded braid to eliminate all hum on my signal.

73,
Dave AB7E

On 9/23/2011 4:33 AM, DK5EW wrote:

> Dear Buck,
> thanks for your tips but I'm not sure if I have to do any mor because my
> K3 is brand new !
> It came 05.September 2011 and has serial 5776.
> 73's Erwin/DK5EW
>
> Am 23.09.2011 13:24, schrieb Buck k4ia:
>> It is not a fan, it is RF or other noise getting back into the mic
>> circuit. I had the same problem. Check the two mods on the Elecraft K3
>> Enhancements and Application Notes page. Look for Older K3 Mods>
>> "Front Panel Microphone" and "Improving the Immunity of the real panel
>> RS232 and audio connectors" to see if they apply to your rig's serial
>> number. Do both to solve your problem.
>>
>>
>> Buck
>> k4ia
>> K3 # 101
>>
>> On 9/23/2011 6:39 AM, DK5EW wrote:
>>> Hi all,
>>> I use at my K3 a HEIL PRO SET ELITE "IC", I had this as I use it at my
>>> old ICOM IC-275H as well.
>>> Now I recognised that I have a small noise on modulation like a fan that
>>> gives me some power output when I just push PTT.
>>> OK I have in my shack 2 additional fans for cooling the PA so I switched
>>> them of. The noise is lower but still there.
>>> and there are no other noise sources. So my setting for the HEIL headset
>>> are:
>>> - MIC: 25
>>> - CMR: 25
>>> - MIC SEL: RP + HIGH BIAS
>>> - MIC+LIN: OFF
>>> Do you have any idea if I can change setting to cancel that noise ?
>>> I can not believe that the microphone is that sensitive to pick up all
>>> little noises around.
>>> best regards Erwin/DK5EW
>>>
>>>
>>>
>>> -----
>>> eMail ist virenfrei.
>>> Von AVG überprüft - www.avg.de
>>> Version: 10.0.1410 / Virendatenbank: 1520/3913 - Ausgabedatum: 22.09.2011
>>> ______________________________________________________________
>>> 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
>>
>>
>>
>
>
> -----
> eMail ist virenfrei.
> Von AVG überprüft - www.avg.de
> Version: 10.0.1410 / Virendatenbank: 1520/3913 - Ausgabedatum: 22.09.2011
> ______________________________________________________________
> 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
>

DK5EW

Re: noise on SSB modulation

In reply to this post by DK5EW

Hi all,
I did manage it now by reducing mic and comp so its fine now.
All settings was to much with 25 - now it is 10/15 with the HEIL.
Thanks for fast answer - a good reflector !
I like it !;-)
73's Erwin/DK5EW

Am 23.09.2011 12:39, schrieb DK5EW:

Martin-2

Re: noise on SSB modulation

In reply to this post by DK5EW

This occurs when CMP and MIC settings are very high, while TX Gate is
set too low.

Maybe an increase in TX Gate level and reducing MIC and/or CMP will cure
the other problem with the transverter.

--

73, Martin DM4iM
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David Gilbert

Re: noise on SSB modulation

In reply to this post by DK5EW

I honestly don't know, since I think it would depend on how
conscientious the laptop manufacturer was handling ground issues. There
may not be any assurance that signal grounds are common with things like
the switching power supply ground, etc.

I would think that it's worth a try, though.

73,
Dave AB7E

On 9/24/2011 9:34 AM, alan geller wrote:

> Dave,
> If one is using a laptop, can a screw post from an unused multi-pin
> style connector be an effective ground connection?
>
> Alan/K6ADG
>
> Date: Fri, 23 Sep 2011 09:08:26 -0700
> From: David Gilbert <[hidden email]
> <mailto:[hidden email]>>
> Subject: Re: [Elecraft] noise on SSB modulation
> To: [hidden email] <mailto:[hidden email]>
> Cc: [hidden email] <mailto:[hidden email]>
> Message-ID: <[hidden email]
> <mailto:[hidden email]>>
> Content-Type: text/plain; charset=ISO-8859-15; format=flowed
>
>
> If you are using any kind of rig control with your computer (and
> therefore have a shield connection between the K3 and the computer, such
> as via an RS-232 cable), make sure the chassis of your K3 is securely
> bonded to the chassis of the computer with a very short length of large
> gauge wire or section of shielded braid. I had to go down to less than
> a foot of RG-8 shielded braid to eliminate all hum on my signal.
>
> 73,
> Dave AB7E

Jim Brown-10

Re: noise on SSB modulation

That works with Thinkpads of the T2x and T4x vintage. I suspect that it
works with many others. I've been doing this for years to eliminate
hum/buzz issues that result from leakage current from the AC power system.

See http://audiosystemsgroup.com/HamInterfacing.pdf

> If one is using a laptop, can a screw post from an unused multi-pin
> > style connector be an effective ground connection?

73, Jim Brown K9YC
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