[Elecraft] Problems on 40M with 100 watt section

[Rich McCabe]

Well thanks for everyones comments.

The CAL CUR made a big difference. And after I powered it off and back on, 
everything seemed pretty good. Did a partial alignment after that. The radio 
draws less with the 100watt running than the 10watt. It is averaging about 
2.6 now.

I have excellent power out on 40-160 (115-130 watts). About 95 watts on 20 
meters, and is 85 on 10 and 30 but only 75watts on 15 meters. So maybe what 
Vic is saying makes sense for my upper bands.

Tom, I am guessing you are right about the parasitic. I still have one 
quirk. Goes wild tuning on 40 meters high power. If I run the ATU at low 
power it tunes to 1:1 and I can bump the power up to full and its fine !!

73,

Rich
kd0zv

----- Original Message ----- 
From: "Vic Rosenthal" <vic at rakefet.com>
To: "Elecraft Reflector" <elecraft at mailman.qth.net>
Sent: Saturday, March 18, 2006 8:17 PM
Subject: Re: [Elecraft] Problems on 40M with 100 watt section


> Rich McCabe wrote:
>
>> Time to search the archives. Any comments would be appreciated.
>
> There is a possible problem with some of the resistors that have been
> supplied for R19/R20 having a larger than usual inductance; and also
> some capacitors at C80/81 being at the low end of tolerance.  This
> causes the KPA100 to require much more drive on 20/30/17 meters.  You
> will see normal current draw at 10 watts, but when you have the
> amplifier set for 100 watts the driver current will be higher, and it
> won't be possible to get full power out.
>
> Gary Surrency <gary at elecraft.com> has dealt with this problem and can
> make suggestions.
>
> Good luck,
> -- 
> 73,
> Vic, K2VCO
> Fresno CA
> http://www.qsl.net/k2vco
>
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