+++++++++++++++ Tim, Spread the turns on T5 as wide as possible, and check the VCO voltage at 3500kHz. If it drops, but not enough, you'll need to take off one turn from the 16 turn primary. Several people have had to do this. 73, Gary Surrency AB7MY Elecraft Technical Support On Wed, 09 Aug 2000 17:26:45 -0500 Timothy Stabler writes: > Finally, even with teaching a huge overload this summer, I am at > alignment, part 2. In the procedure, it says to put a DMM on R30, > then > tune the L30 slug to get a voltage of 6 volts. Solrry, mine stays > at > 7.47-7.48 the whole time. > > My eyes seem to overlook anything in the "troubleshooting" section, > so > am asking for anyone's ideas. > > Thanks ++++++++++++++++ From: "Bill Magruder" To: Date: Fri, 18 Oct 2002 13:00:31 -0700 Organization: Microsoft Corporation Subject: [Elecraft] K2 #2862 Passed Alignment and Test Part II Everyone; Well I made it to Page 61 of the K2 Manual and everything is going fairly smoothly. Got stuck on the VCO Alignment where you "adjust Inductor L30 until the voltage at R30 reads 6.0 volts". First try I was only getting a maximum of 4.5 volts. Well I scratched my head and started checking. Noticed I had swapped Diodes D39 with D33, must have got the numbers confused in my head. Everything else looked OK. Still couldn't get more than 4.5 volts. So this morning I pulled transformer T5 and rewound it. Now I got 5.5 volts, gained 1 volt, progress in the right direction but still not good enough. What should I do next? Check more components, check voltages, pull T5 and rewind it for the 3rd time? I was running out of ideas so I finally broke down and emailed support at elecraft.com. Talk about good support Gary emailed me back in less than 30 minutes, "Compressing the red turns will increase the VCO voltage and spreading the turns will decrease the VCO voltage" Eureka, now that make sense, I made the mistake of spreading the turns trying to make sure I had 80 or 90% core coverage. I reached in with the plastic tuning and compressed the red windings and in 10 minutes I have the voltage set at 6.000 volts. Great kit and great support, now on to Assembly, Part III only 10 more pages to go. Thanks for all the help, Bill KD7KST ++++++++++++++ Date: Wed, 21 May 2003 06:05:31 -0700 (PDT) From: Harry Yingst Subject: Re: [Elecraft] [Remedy] K2 #1059 VCO Alignment to 6.0V To: wo7t at juno.com, elecraft at mailman.qth.net I had to squeeze the turns on T5 together a little bit to get it to come up to 6.0 v. K2 sn 3458 --- wo7t at juno.com wrote: > > Hi All: > > Just wanted to document the resolution to what's been my only > issue to date on my K2 build up. > > I guess on some of the earlier K2's I missed recommendations > to drop back to 15 primary windings on T5 vs. the manual instruction > to 16. Once I did this, I had variablity with L30, and could hit > the 6.0V level. > > Many thanks to Carl Morris, who led me down this path. I was somehow > believing at the higher voltage I would still see variability with > tuning L30. Not so. If starting voltage here is too high, take off > a primary turn. > > > 72 > Mark > > > > > > > > > Hello All: > > > > I have a problem VCO Aligment. > > > > The voltage on R30 should be 6.0V but I have 8.35V, and no > > amount of turning L30 changes it from 8.35V. It's steady > > at that voltage. > > > > C72 is 271, L30 is T1005, T5 is a yellow toroid, 16 turns of red > wire > (pads 1&2), 4 turns of green (3&4) > > > > I judge from some other postings that removing a primary winding > might > > move my voltage reading down, but why no variablity even at current > point? > > > > Any help most appreciated....... > > > > 72, > > Mark > ++++++++++++++++++ Date: Sat, 31 May 2003 19:40:56 -0700 (PDT) From: Harry Yingst Subject: Re: [Elecraft] K2 Dayton Purchase Under construction To: pfb , elecraft at mailman.qth.net > 1) For the PLL Reference Oscillator Range test I have 13.15 and the > range > listed in the manual is 9.8 to 13 kHz. Is this .15 that I am out of > the > range a problem? Your Fine you just have a little extra range (mine was 13.98) > > 2) I am not getting the votage reading on Inductor L30 under the VCO > alignment phase of the manual. This inductor is now "bottomed out" > and > reads only 5.5 V. T5 has the right number of windings on both the > primary > and secondary sections (16 red and 4 green) with the inductor stamped > 1005 > on the can as per the assembly directions. The last thing mentioned > to > check is C 72. Installed in this location is small blue one stamped > 271J. > I believe all of these referenced checks are correct and they have > been > checked, rechecked and double checked......Is there anything else > someone > can suggest to check or is this voltage not that critical? I ran into the same problem squeeze your turns on T5 together more so the occupy less room and your voltage will come up. ===== -- Harry - AB2PN ++++++++++++++++