Fixed. It was a solder connection on the low pass filter board. When the ATU pushed a bit on the LPF board, the power took a dip. I re-soldered the two 2-3 junctions on the LPF. The power is constant now, about 3.6 or so on 7 thru 14 and about 4.1 on 80M with the tuner in or out. It was all in the LPF board...both issues. I was really careful with that part...but not careful enough :) Thanks again.
Chuck, KE9UW aka Jack, BMW Motorcycles BMWMOA #224 ________________________________________ From: Don Wilhelm [[email protected]] Sent: Monday, June 04, 2012 9:19 PM To: hawley, charles j jr Cc: [email protected] Subject: Re: [Elecraft] KX1 ATU causes power to drop off... Chuck, That is progress, but for the life of me, I cannot think of any way the KXAT1 would cause the power to gradually decrease. It is getting late for me today, so I will sleep on it and see if anything pops into my head in the morning. One thought that does occur to me is that there may be a bad solder connection somewhere in the KXAT1. 73, Don W3FPR On 6/4/2012 10:04 PM, hawley, charles j jr wrote: > Yes. E was not going low and F not turning on the relay. > The power out on 80M is 4 watts now. The other bands > are around 3.6 to 3.8 watts. > I still have the tuner in reduces the power out on > all bands and drops to less than a watt. > When I push on the LPF board, the power goes down... > and the ATU does that with a relay. > So that's my problem. I'll check why. > Thankyou so much, I would have been going in circles without > the LPF relay tip. > > Chuck, KE9UW > aka Jack, BMW Motorcycles BMWMOA #224 > > ________________________________________ > From: Don Wilhelm [[email protected]] > Sent: Monday, June 04, 2012 7:44 PM > To: hawley, charles j jr > Cc: [email protected] > Subject: Re: [Elecraft] KX1 ATU causes power to drop off... > > Chuck, > > Look at the Low Pass Filter. > The PA transistor cannot really go to 10 watts output - I suspect the > relay on the LPF board is not being activated on 80 meters and is > allowing a low of 2nd and 3rd harmonic energy get through. A 'scope > would show that, but for some reason or another, that makes the 80 meter > output look like 10 watts of power on a wattmeter. > > Once you get the Low Pass Filter working correctly on all bands, try the > KXAT1 again and if the power falls off - I don't think that is a related > problem. > > 73, > Don W3FPR > > On 6/4/2012 6:43 PM, ke9uw wrote: >> I just finished the KX1 kit and without the tuner, power output into a 50 ohm >> load is about 10W on 80M, and 4W on 40M, 30M, and 20M using a Bird meter, >> 50W slug. >> However the ATU which seems to work well in all testing, all the relays >> click, etc., in TUNE the power starts out at a reading of about 3 watts (40, >> 30, 20...a watt higher on 80) and falls off in about 2 to 3 seconds to about >> .5 watts. The Bird meter shows exactly the same power fall off. >> Also the SWR reading in all cases reads 1.0 using the dummy load. So it >> seems like something is heating up (don't feel any heat anywhere) and the >> power falls off...but it still always reads an SWR of 1.0 when I go out of >> TUNE. >> When I remove the ATU and install the jumper the power is steady for all >> bands (just higher on 80M). >> > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
