Thanks, Joe. I can confirm my 590SG has no problem with Win 8.1 or 10.
73, John N1JM
> On Jul 30, 2015, at 6:43 AM, Joe Subich, W4TV <lists@subich.com> wrote:
>
>
> The "bug report" is highly inaccurate and the instruction to
> set the "microphone" level to 100% is completely *wrong*.
>
> Right click on the microphone slider and set the display for
> *decibels*. In Windows 7 the microphone slider scale will range
> from -196.0 dB at 0 to +30 dB at 100% while in Windows 8.1
> the scale will be -96.0 dB to +30.0 dB.
>
> Negative gain levels represent attenuation between the input of the
> CODEC and the analog to digital converter while positive gain levels
> represent excess gain. Sands is completely *wrong* when he says any
> value below 100% represents attenuation. In fact, any value above
> 0.0 dB represents *GAIN* in the CODEC.
>
> There is one "bug" in Windows 7 and prior - the USB Audio Class
> driver will reset the gain of the endpoint (input) on any CODEC
> that has a *single input identified as "microphone"* every time
> the CODEC is opened. This means Windows sets some members of the
> TI PCM29xx family to +30 dB on each use. *THIS BUG HAS BEEN FIXED*
> in Windows 8 and later.
>
> The best recommendation for setting USB levels for any "microphone"
> input supported by the Windows "USB Audio Class" driver is:
>
> - start the program that uses the sound card in question
> - go to Control Panel | Sound | Recording tab, double click on
> Microphone - USB Audio Codec device
> - on the Levels tab, right click on the microphone slider and
> set the units to *dB*
> - adjust the slider for 0.0 dB +/- 0.5 dB - this will typically
> be 3% in Windows 7 and 54% in Windows 8.1
> - tune to strong carrier (S9+)
> - watch VU meter on Recording tab and adjust output level from the
> radio (typically the RX pot on the interface - "Line Out" in the
> K3/K3S) to 2 bars below full scale. If it not possible to reach
> 2 bars below full scale (the K3/K3S has plenty of excess drive)
> increase the level slider slightly until signal is no more than
> 2 bars below full scale.
>
> I no longer have working XP or Vista systems and do not recommend
> the use of obsolete operating systems. However, the same procedure
> (adjust for 0.0 +/- 0.5 dB) should also work with XP and Vista to
> prevent overdrive and clipping there.
>
> In any operating system, a 0 dB input gain setting will provide the
> best balance of dynamic range and sensitivity in a sound card with
> properly designed audio input circuits. Audio from the transceiver
> should be set so the no-signal "sky noise" is about 15 dB above the
> noise floor of the CODEC and the strongest signals no more than "2
> bars" below the top of the "VU Meter" to prevent clipping.
>
> It may be more difficult to properly adjust levels in some Icom
> transceivers that offer no hardware control of the audio levels
> into the PCM29xx family than in external interfaces or the Kenwood
> (and Elecraft K3S) transceivers that *do* provide control over the
> audio level to the CODEC.
>
> This "bug" *IS* a compelling reason to upgrade to Windows 8.1 or
> Windows 10!
>
> 73,
>
> ... Joe, W4TV
>
>
>
> On 2015-07-30 1:08 AM, 'Jim' jimw7ry@gmail.com [N1MMLogger-Digital] wrote:
>> This was from the RTTY reflector. I though it would be appropriate for here
>> too. Both my IC7600 and new IC7410 have this issue.
>>
>> 73
>> Jim W7RY
>>
>>
>>
>> Found this article on Reddit tonight. Apparently this gentleman has
>> discovered through some testing that certain TI chipsets used in some
>> popular rigs and a popular USB interface may be causing serious errors in
>> digital decoding. There's a link to the Youtube video showing the bug, and
>> how he's found a work around for it. Apparently there's a possible issue
>> with some Icom rigs with built in USB audio, as well as the Kenwood TS590
>> series, and the Signalink USB Interface.
>>
>>
>> https://www.reddit.com/r/amateurradio/comments/3eytah/huge_windows_bug_ruining_your_receive_performance/
>>
>>
>>
>>
>>
>> Charlie
>>
>> N5WE
>>
>>
>>
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>>
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