K3 Beta firmware rev. 2.46 -- 40 meter PA current reduction

[wayne burdick]

K3 beta-test firmware revision 2.46 is now available. Details appear
below. Be sure to use the latest revision of K3 Utility to do the
downloads.

Please send any problem reports to [hidden email]. For
instructions on how to load beta firmware, please see:

   http://www.elecraft.com/K3/k3_software.htm

73,
Wayne
N6KR

* * *

MCU 2.46 / DSP 1.92, 10-3-2008

* 40 METER PA CURRENT REDUCTION: This revision corrects the low-pass
filter configuration used on 40 m. The 10/12 LPF, not the 6 m LPF, is
now used in-line with the 40 m LPF. This optimizes return loss, keeping
current at the target level at 100 W (about 20 A). Some K3s may have
had 40-m current drain increase running rev 2.45.

* NOTE ON AM COMPRESSION: Starting with MCU 2.45/DSP 1.92, speech
compression has been disabled in AM mode. We hope to create a more
effective compressor for AM in a future revision; the original was
adding distortion without increasing “punch”. On the other hand, the
available AM modulation level  has been increased, and we’re better
utilizing the mic AGC system in this mode.


---

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[dave.wilburn]

Works great here Wayne.  My antenna was a little "grumpy" on 40m, and
didn't tune down as far as on the other bands.  From what I hear, that
is not unusual.  But these changes have greatly improved how it tunes.
  Thanks!

David Wilburn
NM4M
http://www.nm4m.com





wayne burdick wrote:

> K3 beta-test firmware revision 2.46 is now available. Details appear
> below. Be sure to use the latest revision of K3 Utility to do the
> downloads.
>
> Please send any problem reports to [hidden email]. For
> instructions on how to load beta firmware, please see:
>
>   http://www.elecraft.com/K3/k3_software.htm
>
> 73,
> Wayne
> N6KR
>
> * * *
>
> MCU 2.46 / DSP 1.92, 10-3-2008
>
> * 40 METER PA CURRENT REDUCTION: This revision corrects the low-pass
> filter configuration used on 40 m. The 10/12 LPF, not the 6 m LPF, is
> now used in-line with the 40 m LPF. This optimizes return loss, keeping
> current at the target level at 100 W (about 20 A). Some K3s may have had
> 40-m current drain increase running rev 2.45.
>
> * NOTE ON AM COMPRESSION: Starting with MCU 2.45/DSP 1.92, speech
> compression has been disabled in AM mode. We hope to create a more
> effective compressor for AM in a future revision; the original was
> adding distortion without increasing “punch”. On the other hand, the
> available AM modulation level  has been increased, and we’re better
> utilizing the mic AGC system in this mode.
>
>
> ---
>
> http://www.elecraft.com
>
>
>
>
>
>
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
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> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
>

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[Alan Bloom]

I just installed the KRX3 and upgraded to the latest firmware (MCU 02.46
& DSP 01.92, from 02.10/01.81).  Now the power calibration is way off.
Even adjusting CONFIG:WMTR LP and CONFIG:WMTR HP to the end of their
range (180) I can't get the power low enough.  For example, setting 75
watts gives about 100W output on an external wattmeter.  A 5W setting
gives about 7W output.

I'm almost certain this problem did not exist before I upgraded.
Anybody have any ideas?

Al N1AL


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[Alan Bloom]

In case anyone is still interested, the problem turned out not to have
anything to do with firmware.  I replaced the wattmeter diodes and it
works fine now.

Al N1AL

On Thu, 2008-10-16 at 14:50, Alan Bloom wrote:

> I just installed the KRX3 and upgraded to the latest firmware (MCU 02.46
> & DSP 01.92, from 02.10/01.81).  Now the power calibration is way off.
> Even adjusting CONFIG:WMTR LP and CONFIG:WMTR HP to the end of their
> range (180) I can't get the power low enough.  For example, setting 75
> watts gives about 100W output on an external wattmeter.  A 5W setting
> gives about 7W output.
>
> I'm almost certain this problem did not exist before I upgraded.
> Anybody have any ideas?
>
> Al N1AL

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