[Elecraft] KPA100/KAT100 on 160 Hi Current

[John Reiser]

Hi Julius and Craig,

Ordinarilly, I have my KAT100 in line to flatten my antennas.  During the 
alignment and test phase on the bench it was not used.  I just had a watt 
meter and dummy load connected.  I usually have the power set to 100 watts 
out

I will experiment to see if there is a power-out point below which the 
current draw seems normal (15-20 amps) and report back.

John, W2GW

----- Original Message ----- 
From: "J F" <phriendly1 at yahoo.com>
To: "John Reiser" <reiserj at optonline.net>; "Elecraft Discussion List" 
<elecraft at mailman.qth.net>
Sent: Thursday, December 07, 2006 10:49 AM
Subject: Re: [Elecraft] KPA100/KAT100 on 160 Hi Current


> Hi John,
>
> Do you use the KAT100 with yours? Or is it just
> straight to the load?
>
> I do see a lot of RF in the shack with my sniffer on
> 160. It seems like it is coming from the sides of the
> KAT100. I'm going to experiment this weekend,
> hopefully, taking the tuner out of the line altogether
> and see if it makes a difference.
>
> I'll post as soon as I can.
>
> Cheers,
> Julius
> n2wn
>
>
> --- John Reiser <reiserj at optonline.net> wrote:
>
>> 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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