[Elecraft] Probelm with KPA-100

[AJSOENKE at aol.com]

Although the KPA is installed and is responding to setup configs, there is  
one area that is sometimes overlooked. The internal RF connection to the Main  
board needs to be connected correctly, and the antenna needs to go to the KPA  
SO239, not the Mainboard BNC.
 
Al WA6VNN
+++++++++++++++++++
In a message dated 6/15/2008 7:46:16 P.M. Pacific Daylight Time,  
w3fpr at embarqmail.com writes:
Dave,

How is receive with the KPA100  in-line?  If receive is degraded, then 
the KPA100 LPF may be the  problem, but if power output is the only 
problem than the PA transistors (or  the T/R switch) is the area that 
needs attention.

The first step that  I would take is to check the bias adjustment - do 
the steps indicated in the  manual.  Secondly, check the RF voltages at 
the input to the KPA100 and  the bases of the PA transistors - if the 
bases are receiving RF, then the  KPA100 should amplify.

73,
Don W3FPR

Dave White wrote:
>  I have a KPA-100 that is not putting out any power.  The K2 operates  
> fine using the standard "QRP" power (up to 10 watts).  Power is  good 
> and the SWR is low.  When the power control is advanced to  bring in 
> the KPA-100 (relay "click"), the power reading immediately  goes to "1" 
> and there is no power output.  The KPA-100 is  recognized and the PA is 
> turned "ON" in the setup menu. Everything else  appears normal .This is 
> a used KPA-100 and there are no obvious signs  of damage; the 
> construction quality looks to be excellent. The previous  owner said 
> there was no history of problems.
>
> Any quick  ideas on where to start the troubleshooting process?  I have 
> some  "hobbyist" test equipment and "modest to good" troubleshooting 
>  skills.
>
> Thanks in advance for your help.
>
>  Regards
>
> Dave White, VE6DRW
>  dwds at trinustech.com
>
>
>
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