[Elecraft] KPA100/KAT100 on 160 Hi Current

[Fraser Robertson]

Hi, our clubs K2/100 has the same problem with high curent at full power on 
160m, but my own is ok.  Has anyone found a cure?

73 Fraser G4BJM


>From: John Reiser <reiserj at optonline.net>
>To: J F <phriendly1 at yahoo.com>,Elecraft Discussion List 
><elecraft at mailman.qth.net>
>Subject: Re: [Elecraft] KPA100/KAT100 on 160  Hi Current
>Date: Thu, 07 Dec 2006 10:42:56 -0500
>
>Hi Julius,
>
>Both my K2/100s, #4970 and #5570 exhibit excessive current draw on 160 
>meters, as indicated by the ammeter on my 30 watt Astron PS.  It gets up to 
>27 or 28 amps.  I use a 30 amp fuse.  In every other respect, my two 
>K2/100's work perfectly.  Current draw on all the other bands is less than 
>20 amps.
>
>I don't have an antenna for 160, so I never transmit on that band anyway, 
>and this is not a big problem for me.  Still, being a bit of a 
>perfectionist, it bothers me that it exists.
>
>I mentioned it on the reflector a while ago.  Someone said they had the 
>same experience, but had no solution.  Someone else suggested that I retune 
>the 80 meter bandpass filter to represent a compromise between 80 and 160.  
>I tried that, but the excessive current draw continued regardless of the 
>bandpass tuning.  (Could it be due to the KPA100 going into oscillation at 
>the 160 frequency?)
>
>When I saw your post, I became hopeful that it might evoke a response from 
>someone who had come up with the definitive solution.  But so far there 
>hasn't been any.
>
>Good luck and 73,
>
>John, W2GW
>
>----- Original Message ----- From: "J F" <phriendly1 at yahoo.com>
>To: "Elecraft Discussion List" <elecraft at mailman.qth.net>
>Sent: Wednesday, December 06, 2006 5:49 AM
>Subject: [Elecraft] KPA100/KAT100 on 160 Hi Current
>
>
>>Well ARRL 160 is history now.
>>
>>As usual, with the K2 I heard more than I could get to
>>hear me ;o) Evidently I heard and worked more than
>>some of the local contesters with "other" brand
>>equipment heheh.
>>
>>Anyway I have a problem... I use the KPA100 with the
>>KAT100, and there may be no connection between the
>>two, to stretch the bandwith of my antenna. If I set
>>the K2 for 100 watts (or just twist the knob far
>>clockwise), the ALC does not kick in. In a key down
>>situation, the current keeps climbing until the fuse
>>blows. If I set it for 99 watts (I realize this is not
>>that precise) the ALC does function somewhat. I've not
>>tried it with a dummy load. The antenna was fairly
>>well matched (1.2:1 at it best point)and has a current
>>balun on it. So this really shouldn't be happening. Do
>>I have a problem with the KPA?
>>
>>Thanks,
>>
>>Julius
>>n2wn
>>
>>
>>
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>
>
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