Wes, I understand that... assuming you are responding to me... I was asking
Joe what .inf file to modify and then reinstall the USB CODEC generic
driver to disable the irritating microphone boost which makes it too
sensitive.  I'm taking about the KIO3B USB CODEC here... Max NG7M

On Sat, Aug 5, 2017 at 1:24 PM, Wes Stewart <wes_n...@triconet.org> wrote:

> Except when the sound card is in the computer instead of the radio, "Line
> In" is receiving signal from the program via the sound card 'speaker'
> output, not the microphone.  Moving the card into the radio doesn't change
> this. The only thing changed is it's too darned sensitive.
>
> Regards,
>
> Wes  N7WS
>
>
>  On 8/5/2017 9:39 AM, Joe Subich, W4TV wrote:
>
>>
>> On 8/5/2017 11:14 AM, Wes Stewart wrote:
>>
>>> But IMHO, you need to put a 30 dB attenuator on the input of the
>>> internal sound card; it is way too sensitive. I'm having to run the Windows
>>> gain at less than 5% and Line In at 10 or less.
>>>
>>
>> Actually, you need to adjust the options in the Windows *.inf file
>> used for the PCM-series CODEC (or use the codec that identifies as
>> line level).  Windows is turning on a 20 dB preamp in the CODEC.
>>
>> I suspect if one sets the Windows Sound Options (Control Panel) to
>> display dB rather than percentage, the minimum level will be some-
>> thing like 16 to 20 dB!  That indicated the fixed 20 dB "mic preamp"
>> is engaged.
>>
>> 73,
>>
>>    ... Joe, W4TV
>>
>>
>> On 8/5/2017 11:14 AM, Wes Stewart wrote:
>>
>>> Wayne,
>>>
>>> There are no beat notes. These frequencies, at least from the FT8
>>> program in Tune mode are single frequency.  Based upon output RF spectrum
>>> measurements*, with for example 1010 Hz input and 4-5 bars of ALC, I see
>>> spurious or intermodulation sidebands, down -65 dBc.  If I change nothing
>>> else but adjust the tone frequency to 1000 Hz  the spectrum is the same but
>>> the ALC bars are cyclic, going from none to 4-5, at about the 2 HZ rate
>>> Brian reported earlier. (Slow ALC in action?)  That's the good news.
>>>
>>> If I set the tone to 1500 Hz, the FT8 mid-band target, I'm presented
>>> with the cyclic ALC and some ~193 Hz, -50 dBc sidebands.
>>>
>>> I have tried this with both the K3S internal sound card and via Line
>>> In/Out into my laptop sound card.  The results are more-or-less the same.
>>> But IMHO, you need to put a 30 dB attenuator on the input of the internal
>>> sound card; it is way too sensitive.  I'm having to run the Windows gain at
>>> less than 5% and Line In at 10 or less.
>>>
>>> I would suggest that you do some measurements with a low-distortion sine
>>> wave audio source run into the radio to eliminate the possibility that this
>>> junk is a result of all of the digitally generated tones.
>>>
>>> If this (what I will call a) problem continues to exist then I think a
>>> fix is in order.  Expecting users to select particular frequencies to use
>>> to set gain levels isn't an acceptable workaround.
>>>
>>> Regards,
>>>
>>> Wes  N7WS
>>>
>>>
>>> * My "spectrum analyzer" is my SDR-IQ which I have used to measure TX
>>> IMD on both my K3 and K3S.  Your IMD
>>>   measurements on my K3S concurred with mine within 1 dB or less.
>>>
>>> On 8/4/2017 4:45 PM, Wayne Burdick wrote:
>>>
>>>> Is it possible that a beat note between tones (and their harmonics) is
>>>> what’s modulating the ALC reading? If so, moving the tone slightly off the
>>>> standard pitch may be an acceptable workaround.
>>>>
>>>> Wayne
>>>> N6KR
>>>>
>>>>
>>>> On Aug 4, 2017, at 1:42 PM, Wes Stewart<wes_n...@triconet.org>  wrote:
>>>>>
>>>>> Good find Brian!!! I see it too in FT8.
>>>>>
>>>>> This probably explains the great variability in results reported. Some
>>>>> of us have a problem, others say, Huh, what the heck are you talking 
>>>>> about?
>>>>>
>>>>> Wes, N7WS
>>>>>
>>>>>
>>>>> On 8/4/2017 11:33 AM, Brian Hunt wrote:
>>>>>
>>>>>> Here's some followup:
>>>>>> FLDIGI shows the "pumping" affect with carrier tones of 500, 1000,
>>>>>> 1500, and 2000 Hz.
>>>>>> WSJT-X 1.8 shows the "pumping" affect with carrier tones of 1000,
>>>>>> 1500 and 2000 Hz (couldn't select 500 Hz).
>>>>>>
>>>>>> The affect is very narrow with frequency.  10 Hz either way and the
>>>>>> output and ALC display and MON output is rock solid.  Changing the K3
>>>>>> filter center frequency has no effect on the above.
>>>>>>
>>>>>> 73,
>>>>>> Brian, K0DTJ
>>>>>>
>>>>>> On 8/4/2017 10:58, Brian Hunt wrote:
>>>>>>
>>>>>>> I spent some quality time with my K3, FLDIGI and an oscilloscope
>>>>>>> today.  I had the same problem as described.  Looking at my USB 
>>>>>>> soundcard
>>>>>>> output to the K3, the amplitude of the audio from FLDIGI in TUNE mode 
>>>>>>> was
>>>>>>> rock solid. Looking at the MON output from the K3, the level oscillated 
>>>>>>> in
>>>>>>> time with the ALC "pumping" at about 2.4 Hz (timed with a stop watch).  
>>>>>>> At
>>>>>>> the same time the K3 power output into a dummy load was rock solid at a
>>>>>>> selected 10 watts.
>>>>>>>
>>>>>>> Then I changed the carrier frequency in FLDIGI slightly off 1500 Hz
>>>>>>> and the "pumping" went away!  At 1515 Hz I could easily set the ALC to 
>>>>>>> the
>>>>>>> desired 4 bars solid, 5th flickering.  Then I remembered (and verified)
>>>>>>> that the default filter center in DATA A mode is 1500 Hz. I changed the
>>>>>>> filter center frequency to 1450 Hz and moved the FLDIGI frequency around
>>>>>>> but couldn't reproduce the "pumping".
>>>>>>>
>>>>>>> I plan to repeat the same tests with WSJT-X 1.8 but wanted to get
>>>>>>> this out to the group.
>>>>>>>
>>>>>>> 73,
>>>>>>> Brian, K0DTJ
>>>>>>>
>>>>>>>
>>> ______________________________________________________________
>>> Elecraft mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:Elecraft@mailman.qth.net
>>>
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>>> Message delivered to li...@subich.com
>>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Elecraft@mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to wes_n...@triconet.org
>>
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft@mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to m.matthew.geo...@gmail.com
>



-- 
M. George
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com

Reply via email to