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

[David 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 k3support at elecraft.com. 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
> 
> 
> 
> 
> 
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