Chris,
Is there any chance you have T4 wound for the "better efficiency at 5
watts" ratio of 2:2:1:1 turns?
If so, be aware that this winding ratio is *only* for a QRP CW only K2.
If the KSB2 is added, it must be changed to the standard 2:3:1:1 ratio.
With the 'better efficiency at 5 watts" mod applied, the efficiency
above the 5 watt level becomes very poor, and may generate HiCur
messages. It should never be used if the KPA100 is added.
73,
Don W3FPR
On 12/3/2013 12:14 PM, Chris Kimball wrote:
Don,
My KSB2 is revision E, July 20, 2004, with the "PSK31 ALC time constant
change" of KI6WX built-in. It doesn't have the increased RF gain mod. Is
there a reference to the mod that you suggest with the R9 -> 15K and a new
1K in the Q1 base?
I was amazed at the instability at the 5W level under tuning to a dummy
load. The measured power levels alternate between 4.3 and 6.4 W with no
points in between. Seems like too much. Since I don't have a pot in this
range, I'm tempted to double R98 and see what happens. (I currently get 6.8
W on 10 meters for a 10 W setting and it doesn't bother me.)
Please let me know about the "1K in Q1 base" mod.
Thanks,
Chris
NQ8X
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