FWIW late in the 160m contest I noticed the K2/100 was a little warm. I switched to the current reading on my power supply and saw numbers in the 27-30 A range. I realized that a couple hours before I had cranked the power all the way up to 111 watts (as high as it went) and hadn't turned it back down to 100. When I turned it down to 100 the current draw looked normal (maxing out around 20 A).
I was transmitting into an antenna that was 3:1 SWR without the KAT100; 1:1 with the tuner. I didn't notice any bad behavior otherwise. Just thought I'd throw this into the discussion for a data point. Craig NZ0R -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of John Reiser Sent: Thursday, December 07, 2006 9:43 AM To: J F; Elecraft Discussion List Subject: Re: [Elecraft] KPA100/KAT100 on 160 Hi Current 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" <[EMAIL PROTECTED]> To: "Elecraft Discussion List" <[email protected]> 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 > > > > ____________________________________________________________________________ ________ > Yahoo! Music Unlimited > Access over 1 million songs. > http://music.yahoo.com/unlimited > _______________________________________________ > Elecraft mailing list > Post to: [email protected] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com > _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
