K3 v. 4.21

[Roy Morris-6]

The 4.21 firmware seems to have normalized the mic gain setting.  On 4.18 I had to reduce the mic gain and reduce TXG VCE to 0dB.  I have left TXG VCE at 0dB and all is still well.  APF appears to work fine now.  It is very smooth and no artifacts.  Thanks.  Roy Morris  W4WFB
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[K2QI]

I concur Roy; something has changed again in the way mic gain is handled
with this firmware iteration.  Prior to 4.14, I had to leave mic gain set to
4 or 5 and bias to low.  Those settings gave me 5-7 bars ALC on normal voice
peaks.  This is with the MH2 hand mic.  After 4.18, I noticed that I had to
turn mic gain up to 15 in order to achieve the same results.  Now with 4.21,
mic gain has to be reduced to 5 in order to keep the ALC happy.

One thing that I'm not sure about however is the difference in setting
required for SSB and FM.  When testing using FM, I have to increase mic gain
by 50% to see a similar ALC readout.  I don't remember if it behaved as such
prior to 4.14.  Can anyone pse confirm?

73 de James K2QI

On Sat, Nov 13, 2010 at 10:20 AM, Roy Morris <[hidden email]> wrote:

> The 4.21 firmware seems to have normalized the mic gain setting.  On 4.18 I
> had to reduce the mic gain and reduce TXG VCE to 0dB.  I have left TXG VCE
> at 0dB and all is still well.  APF appears to work fine now.  It is very
> smooth and no artifacts.  Thanks.  Roy Morris  W4WFB
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
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> Please help support this email list: http://www.qsl.net/donate.html
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--
73 de James K2QI
President UNARC/4U1UN
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[K2QI]

Correction - on FM, I have to increase mic gain settings by 200%, not 50% as
I had written.

For example, what might sound fine using a gain setting of 5 on SSB will not
produce full modulation on FM at the same setting.  I have to turn gain up
to 15 for similar results.

I'm very curious about this now.  Can anyone test their K3 and reply?

Tnx,
James K2QI

On Sat, Nov 13, 2010 at 12:13 PM, James Sarte <[hidden email]> wrote:

> I concur Roy; something has changed again in the way mic gain is handled
> with this firmware iteration.  Prior to 4.14, I had to leave mic gain set to
> 4 or 5 and bias to low.  Those settings gave me 5-7 bars ALC on normal voice
> peaks.  This is with the MH2 hand mic.  After 4.18, I noticed that I had to
> turn mic gain up to 15 in order to achieve the same results.  Now with 4.21,
> mic gain has to be reduced to 5 in order to keep the ALC happy.
>
> One thing that I'm not sure about however is the difference in setting
> required for SSB and FM.  When testing using FM, I have to increase mic gain
> by 50% to see a similar ALC readout.  I don't remember if it behaved as such
> prior to 4.14.  Can anyone pse confirm?
>
> 73 de James K2QI
>

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