Congratulations Scott - now have a good time with that KX1. 73, Don W3FPR
Scott Wright wrote: > Don, > > OK, I got the KXAT1 working! Turns out the documentation was right -- > the wires *are* numbered correctly. My bad. (Shame on me -- no more late > night soldering for Scott...) I got a rock solid 0.000V calibration null > and the power readings are within 0.1 watt of what I'm getting from the > DL1. Now it looks like all I need to do is build an antenna and wire the > stereo plug to my J-38 key. Then it's play time! > > So, thanx again, Don! > > Scott > AC0FQ > > > Scott Wright wrote: > >> Don, >> >> Thanx for your reply! >> >> "When viewed as in the diagram, the leads coming off the core closest to >> you are numbered 2 and 4..." >> >> That's gotta' be the problem then. In my documentation, those two wires >> are labeled as 1&3. Had they been labeled as 2&4, I would have had the >> "clean, drop-in install" I referred to in my original e-mail. Couple >> that with the informational statement, "...the wires labeled (1) and (3) >> should originate from below the core...", it was easy to convince myself >> that such a bizarre lead routing alignment was necessary. >> >> Oof dah... >> >> OK, I'm off to unsolder T1 and try to get it installed correctly. I'll >> let you know what results. >> >> Again, thanx for the pointers! >> >> Scott >> AC0FQ >> >> >> Don Wilhelm wrote: >> >> >>> Scott, >>> >>> The problem lies with #4 and #7 below. >>> Look carefully at the diagram of T1 on page 5 of the KXAT1 >>> instructions. If yours looks 'backwards', then it may be wound in the >>> wrong sense. When viewed as in the diagram, the leads coming off the >>> core closest to you are numbered 2 and 4, and the turns from that end >>> progress clockwise around the core. >>> If you have the sense 'backwards', the leads will cross over under the >>> core when it is mounted - that is not what should happen. If you have >>> it right, the leads will drop straight down from the core onto the >>> board when it is mounted. >>> >>> Yes, all the T1 leads will appear to be shorted together after T1 is >>> installed - that is not a valid check. >>> >>> If everything is correct, you will find a deep null when adjusting the >>> capacitor. The voltage at the null point should be in the tens of >>> millivolt range. If you do not find the null, then look for something >>> wrong with T1, C9, C10, R4 or R5. Also check the orientation of D1 >>> and D2. >>> >>> Do not attempt power or SWR calibration until after you can achieve a >>> good null - all attempts to do so will lead to frustration and >>> incorrect results. >>> >>> 73, >>> Don W3FPR >>> >>> >>> Scott Wright wrote: >>> >>> >>>> I'm having trouble with my KXAT1. More specifically, (1) I can't get >>>> the power reading to adjust up to anywhere near the actual TX power and >>>> (2) the SWR reading with the DL1 dummy load attached is 9.9, which I >>>> assume is not a good thing. >>>> >>>> Here are the data bits: >>>> >>>> 1) There's no 30/80m module. >>>> >>>> 2) I ohm'ed out the DL1 and it reads 50.1 ohms. Close enough. >>>> >>>> 3) With the R1 pot set at ~50%, the KX1's power display is 0.7 watts in >>>> 'tun' mode. The power reading at the DL1 is 3.6 watts, which is pretty >>>> much the same reading I got after I finished the KX1's transmit section >>>> (before adding the AT). Cranked fully CW (?), the maximum displayed >>>> power reading is 2.1 watts on the KX1. >>>> >>>> 4) During calibration, nulling the voltage on the REFL test point >>>> results in a voltage of approx 1.75 volts. I've seen posts on the >>>> reflector where folks are getting nulls well below 1V. I suppose this >>>> isn't a good thing, either... >>>> >>>> 5) I ohm'ed inductors L1, L2, and L3 after installation and all three >>>> read <0.3 ohms. I'll assume that means good >>>> stripping/tinning/soldering. >>>> >>>> 6) I tried ohm'ing transformer T1 after it was installed to see if I >>>> had any shorts but I'm reading <0.3 ohms across any combination of >>>> leads. This (sorta') makes sense -- given how it's gonna' react to DC >>>> -- but doesn't tell me anything. >>>> >>>> 7) I quadruple checked my installation of T1. The picture and notes in >>>> the assembly manual are a bit confusing and unlike all other Ls and Ts >>>> I've installed so far, the footprint/silkscreen for T1 doesn't line up >>>> with how the winding is described. What looks like a clean, drop-in >>>> install results in -- as I read it -- incorrect phasing. Matching T1's >>>> wiring diagram / picture to its silkscreen forces the leads to run under >>>> the toroid in a "contorted" fashion. As ugly as it was going in, that's >>>> how I have it soldered in place. >>>> >>>> 8) When instructed to tune, the resultant SWR is always displayed as >>>> 9.9. (I can hear the relays clicking on-and-off in rapid succession >>>> during the tune...) I tried the inductor/capacitor test outlined in the >>>> KXAT1's troubleshooting guide, but regardless of the L0/1/2/3 or >>>> C0/1/2/3 setting, the SWR always displays as 9.9 >>>> >>>> So, I'm at an impasse. I don't wanna' start randomly removing >>>> components -- I haven't yet had to remove a single component from the >>>> KX1 or the AT -- but I'm at a loss as to what to do next. >>>> >>>> Are there any other troubleshooting steps?? I'll never claim to be a >>>> guru on this stuff -- in fact, I'm not 100% certain how an AT even works >>>> -- so any additional guidance would be greatly appreciated. >>>> >>>> Thanx!! >>>> >>>> Scott >>>> AC0FQ >>>> KX1 s/n 2177 >>>> ______________________________________________________________ >>>> 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 >>>> ------------------------------------------------------------------------ >>>> >>>> >>>> No virus found in this incoming message. >>>> Checked by AVG - www.avg.com Version: 8.0.237 / Virus Database: >>>> 270.11.13/2001 - Release Date: 03/14/09 06:54:00 >>>> >>>> >>>> >>>> >> ______________________________________________________________ >> 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 > ------------------------------------------------------------------------ > > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 8.0.237 / Virus Database: 270.11.13/2001 - Release Date: 03/14/09 > 06:54:00 > > ______________________________________________________________ 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
