[Elecraft] KPA100 problems

Sat Jan 17 16:17:06 2004

Well  I read the troubleshooting and have tried swapping the resistor out
with a pot and changed the value, but have had no improvement on mine. I too
find it annoying and it drives my amp nuts. 7-10 watts at the rig is VERY
significant at legal limit with the amp.

That said, I cant say that I do not have something wrong with my build but
Gary acted like my fluctuation was normal.

73,
Rich
kd0zv

----- Original Message ----- 
From: "Ken Wagner" <[email protected]>
To: "Carl Strode" <[email protected]>; <[email protected]>
Sent: Saturday, January 17, 2004 11:22 AM
Subject: Re: [Elecraft] KPA100 problems

> You guys should look in the K2 Manual in the trouble shooting section
(page
> 7, Appendix E for Rev E manual) under "Transmitter (150-199)" and look at
> code "160  Power Output fluctuates." The "fix" indicated there does work
to
> stop this fluctuation.
> 73, Ken K3IU
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> At 11:25 AM 1/17/04, Carl Strode wrote:
> >David,
> >
> >My K2 #3777 exhibits the same problem.  It is not a "problem" in most
> >cases since a change of few watts has virtually no impact at the
receiving end.
> >
> >HOWEVER, it is a real problem when I use the K2/100 to drive an amp.  I
> >find it very difficult to properly tune my SB-1000 linear when the output
> >from the execiter (K2) is bouncing up and down.
> >
> >Properly loading the grounded grid 3-500Z amp requires it to be fully
> >loaded, so a random step change in exciter output from 35 to 40 to 37 to
> >42 etc. makes tuning a genuine pain.
> >
> >Otherwise my KPA 100 is perfect in all respects.
> >
> >Yes, it certainly would be nice to kill this bug.
> >
> >Carl
> >WA7CS
> >
> >David Clark wrote:
> >
> >>   I  built a KPA100 and aligned it but I am having problems with it.
> >> When I key down and watch the output with a wattmeter the power changes
> >> up and down about 10 watts twice a second until I unkey. I have double
> >> checked all component locations and they are correct. I have emailed
> >> elecraft support and have not got much help. I have tryed realigning
R26
> >> and R27 but it made no difference. I also double checked the bias
> >> current. Ant suggestions???
> >>David Clark
> >>KD7NZK
> >>K2: 2778
> >>
> >>
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