Hi Don, thank you very much, I will definitely take a look at that. It certainly is easy to miscount a densely wound toroid when distracted.
Cheers, Julius n2wn --- Don Wilhelm <[EMAIL PROTECTED]> wrote: > John, Julius, > > The normal thing to look at in a high current > situation is the low pass > filter. Check both on the base K2 and the KPA100. > First thing is to count > the turns on the toroids - count only the turns that > pass through the center > of the core or you might end up with an extra turn. > > On the 160 meter band, one extra turn is all it > takes to create a high > current situation because the cutoff frequency of > the LPF moves down into > the 160 meter band and shunts some of the signal to > ground. > > The KAP100 LPF is easy to sweep with an antenna > analyzer - connect the > ribbon cable to the K2 and select the band of > interest, put a 50 ohm > resistor into the input cable and attach the > analyzer to the SO-239. If you > do not find a low SWR throughout the band, the LPF > is to blame. > > 73, > Don W3FPR > > > -----Original Message----- > > From: [EMAIL PROTECTED] > > [mailto:[EMAIL PROTECTED] Behalf > Of John Reiser > > Sent: Thursday, December 07, 2006 10:43 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 > > -- > > No virus found in this incoming message. > > Checked by AVG Free Edition. > > Version: 7.5.432 / Virus Database: 268.15.11/575 - > Release Date: > > 12/6/2006 12:22 PM > > > -- > No virus found in this outgoing message. > Checked by AVG Free Edition. > Version: 7.5.432 / Virus Database: 268.15.15/579 - > Release Date: 12/7/2006 > 1:31 PM > > ____________________________________________________________________________________ Any questions? Get answers on any topic at www.Answers.yahoo.com. Try it now. _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. 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