James, Very glad to hear that. 3 watts as opposed to 4 is not that much different. The collective gains of Q4, Q5 and Q6 may be to blame. If you would like to boost it a bit, you could put in the KX1 Power Mod resistor changes.
73, Don W3FPR On 1/2/2012 7:33 PM, [email protected] wrote: > Hi Don, > Good suggestion on the cables.. I swapped them out and whatever I did, it now > shows a nice flat SWR on 20m. Perhaps something was loose or maybe the patch > cable I was using as seen better days. > ? > Any idea why it might be showing 3 watts out as opposed to 4? Not that it > makes much difference, just worked Serbia, Sardinia and Croatia with 3 watts > :) > ? > 73& thanks, > ? > James KB2FCV > > > > > -----Original Message----- > From: Don Wilhelm<[email protected]> > To: james1787<[email protected]> > Cc: elecraft<[email protected]> > Sent: Mon, Jan 2, 2012 6:07 pm > Subject: Re: [Elecraft] Not sure my KX1 ATU is working correctly > > James, > > There is nothing band dependent about the tuner - especially in CAL mode > where all the L and C is bypassed. > Try the test on 20 meters again. > There are times when the KX1 "glitches" on an SWR reading, so if you see 9.9 > SWR try it again. > Also check your coax connections - make certain your cables are OK, > especially if you are using adapters - make certain both male and female UHF > connectors are tight (they depend on being tight for the shield path, BNC and > N connectors do not have that dependency). > > Another thing to consider - is the KX1 BNC connector well soldered on the > ground side - it takes a LOT of heat (and time) to make a good solder > connection between that connector and the board ground.? Make certain you > apply heat (use a large iron tip if possible) and be sure the solder actually > flows instead of just being "pasted on".? If there is a bad connection at > that BNC jack, it could explain an occasional SWR = 9.9 indication. > > 73, > Don W3FPR > > On 1/2/2012 3:22 PM, [email protected] wrote: Hi Don, > I followed your instructions and did the following: > I removed my ATU from the KX1 and put the jumper in place. > With my shack tuner, using my Icom I tuned it for a perfectly?flat SWR on 20 > meters. > I moved the coax from my Icom to my KX1. > I peaked the 20a and 20b trimmers > I moved the coax back to my icom and tuned the shack tuner for 40 meters > I moved the coax back to my KX1 and peaked the 40 trimmer > I removed the jumper in the KX1 and re-installed the ATU and set it to CAL. > I connected the KX1 to my dummy load (Bird ERI-003F 150 watt 50 ohm dummy > load) > I changed bands on the KX1 to 20m > I proceeded to adjust trimmer capacitor C9. > I was able to get the voltage to .000 (it had a range from about 2.9 volts > and bottomed out at .000). > The power meter was only showing about 2.8 watts and the SWR showed 1.0 > I connected my icom back up and re-tuned the antenna for 20m > I moved the coax from my icom back to my kx1. > With the KX1 still in cal, I pressed tune. Now the power was showing about > 1.9 watts and 9.9 (infinite) SWR. > I moved the from the KX1 to my icom and tuned the antenna for 40m. > I changed bands on the KX1 to 40m > I moved the antenna from my icom back to the kx1 and made sure it was stil on > CAL. I pressed tune and it was showing 2.9 watts out and 1.0 swr. > ? > These are the results. I'm not sure if I was supposed to see it dip to .000 > volts or not. > It definitely appears the issue is something with 20m. I wish I had a > wattmeter for QRP to see what the power/swr was doing without the ATU on 20m. > Also, I have a 13.8 volt supply connected, 3 watts sounds a bit low? > ? > 73, > James KB2FCV > ? > > > > > -----Original Message----- > From: Don Wilhelm<[email protected]> > To: james1787<[email protected]> > Cc: elecraft<[email protected]> > Sent: Mon, Jan 2, 2012 1:30 pm > Subject: Re: [Elecraft] Not sure my KX1 ATU is working correctly > > > > > James, I am not sure from your prblem description whether you have a > KX1 receiver problem or a KXAT1 problem or some sort of setup problem > with your shack tuner. First thing to do is to peak the KX1 > receiver front end, and you remove the tuner (put the jumper in) and > connect it to a signal generator or to an antenna that presents close to > a 50 ohm load. Do the following things in order: You have a shack > tuner, so I suggest you set it for a 1:1 SWR - you can do that with > another transmitter or with an antenna analyzer - set it up first for 20 > meters. Once you have a 50 ohm signal source connected to the KX1 > input, peak the 20A and 20B trimmers for the maximum output from the KX1. > Re-tune your shack tuner to 40 meters, then connect the KX1 and peak > the 40 meter trimmer - it must be done in that band order, reversing it > will only lead to frustration. After having done that, you can > remove the jumpe r > and install the KXAT1 and set ATU to CAL First connect a good 50 ohm > dummy load and balance (null) the wattmeter with the trimmer capacitor. > If you can obtain a good low millivolts reading, that is good - above > .010 volts is bad, below .003 volts may be the best you can do. > With the KXAT1 still in CAL, again tune your shack tuner to 50 ohms on 20 > - now you can compare the KX1 receive with you other receiver. Then set > the ATU menu to "tun" and it should tune to less than 1.2 and you should > still be able to hear signals at the same level as before Switch your > shack tuner to 40 meters and do the same as you did on 20. After doing > that, if you still have a problem, ask again. On 1/2/2012 12:34 PM, > [email protected] wrote:> Hi Folks,> I just finished putting together > my KX1 with the ATU. I am having a problem with it on 20m when using it > through my shack tuner (viking matchbox to a dipole up 60-70 > ft). As the manual states, I place the tuner into CAL to bypass the > tuner. The problem is that it seems kind of quiet. I listen to a loud S-9 > signal on my IC-746pro and it is much quieter on the KX1. For kick's I > placed it in the tuner-on setting and hit tune. It tuned for a seconds > and now it's louder. I tapped the key and it went back to being > quiet.> ?> I didn't seem to notice this on 40m last night and made a > few QSO's.> ?> Just wondering where I might check to see that > everything is ok. I wonder if C9 on the ATU is set correctly? With my DMM > I was able to get the voltage down to almost zero.> ?> Thanks& > 73,> > > ______________________________________________________________ > 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
