K2 -- is this normal?

[Elecraft mailing list]

Greeting all to all the K2 wizards out there! I'm more curious than concerned, using CW, I notice when I go from FL1 to FL2 my general "noise level" seems to go up to the point I need to turn down the volume -- is this normal behavior? I would expect the noise level to go down as the filtering gets narrower?

I looked at the filter bandwidths using Spectogram and they look normal to me. I set them per Elecraft recommendations. My K2 serial # 3500+ with all the firmware updates and the K2DSP installed.
Happy Holidays to Elecraft and ops.
ed

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[vk2rq]

Sound strange. Do you have the SSB module installed, and have set FL1 to OP1? In that case, when you switch from FL1 to FL2, you are changing from the crystal filter on the SSB module to the crystal filter on the main RF board. Maybe if there is a problem (eg bad solder joint, component in wrong place) on the SSB module, then maybe this is why you observe a difference in the volume?

73,
Matt VK2RQ

> On 21 Nov 2014, at 6:09 am, Eddy via Elecraft <[hidden email]> wrote:
>
> Greeting all to all the K2 wizards out there! I'm more curious than concerned, using CW, I notice when I go from FL1 to FL2 my general "noise level" seems to go up to the point I need to turn down the volume -- is this normal behavior? I would expect the noise level to go down as the filtering gets narrower?
>
> I looked at the filter bandwidths using Spectogram and they look normal to me. I set them per Elecraft recommendations. My K2 serial # 3500+ with all the firmware updates and the K2DSP installed.
> Happy Holidays to Elecraft and ops.
> ed
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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> Post: mailto:[hidden email]
>
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[Don Wilhelm-4]

Ed,

What filter(s) are you using for each of the CW filters?.  There are at
least 2 different ways published by Elecraft for the filter settings.  
The K2 manual uses the default widths of 1.50, 0.70, 0.40, and 0.10
while the KSB2 manual indicates the use of the OP1 filter for CW FL1.
Those filter widths are not graven in stone, the user is able to set
most any filter width desired for his particular operating preferences.

Since you have Spectrogram installed, you can measure the AF signal
amplitude as well as the filter width and placement within the audio
spectrum (just don't change the AF Gain during the comparison).

Normally the amplitude through the filters is close to the same.  If it
varies substantially, you have a problem to locate and resolve.

73,
Don W3FPR

On 11/20/2014 2:09 PM, Eddy via Elecraft wrote:
> Greeting all to all the K2 wizards out there! I'm more curious than concerned, using CW, I notice when I go from FL1 to FL2 my general "noise level" seems to go up to the point I need to turn down the volume -- is this normal behavior? I would expect the noise level to go down as the filtering gets narrower?
>
> I looked at the filter bandwidths using Spectogram and they look normal to me. I set them per Elecraft recommendations. My K2 serial # 3500+ with all the firmware updates and the K2DSP installed.
> Happy Holidays to Elecraft and ops.
> ed
>

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