[Elecraft] K2/100 problem on 80 meters

[Don Wilhelm]

Pierre,

Yes, there was an early version of the KPA100UPKT and only a few were 
shipped.
You may not need all the added parts - they were added because some 
KPA100 owners had added mods to correct other problems, so the parts 
were added to allow any KPA100 to be restored to the standard parts.

You will definitely need the new capacitor for C31, and you may need the 
new crystal.
R4 should be changed to 100k if it has a different value
New capacitors for C80 and C81 were included because some builders had 
changed them in an attempt to cure a low power situation on 20 and 17 
meters.
You should have new resistors to install at R19 and R20 - inductive 
resistors here were the real cause of the low power on 20 and 17 meters.
If you had never changed C71 and C72 to reduce the "click on unmute" 
problem that some K2 owners experienced when the KDSP2 was installed, 
those capacitors will not be needed.

73,
Don W3FPR

Pierre wrote:
> From Don W3FPR
>  
> >But, if you have added the KPA100UPKT, I must ask if your upgrade kit 
> included a new C31 capacitor of 0.22 uF value.  Many KPA100UPKT kits did
> >not include this capacitor until recently.  If this situation fits 
> your case, send an email to pa... at elecraft.com asking for a new 
> capacitor...
>  
> Sometime ago (around 2007), I ordered and received the KPA100UPKT 
> upgrade kit for my K2/100 #5170, but never installed it. I will do it 
> soon.
> After checking the (old) package and the manual page, I see that 
> there are new parts in the instruction errata which I did not 
> receive in 2007: 5 capacitors and a crystal... so will ask Elecraft 
> for them before I start that upgrade.
>  
> Thanks to all for you suggestions.
>  
> 73 de Pierre VE2PID
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