T1 ERRATA
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I was pleased to complete my T1 yesterday, after receiving a couple of missing
1/8 watt resistors from Elecraft. Everything worked right away. Happy Dance time.. Then today..I receive another envelope from Elecraft with Errata, changing R1 and R2 to 1 watt, and T2 to 2 stacked cores. Oh Joy, now I get to take it all apart, desolder the resistors and T2, all while trying not to melt anything I shouldn't. Elecraft really pulled an April Fool on me! -- John W2AGN http://w2agn.net _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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On Apr 1, 2005, at 9:03 AM, W2AGN wrote: > I was pleased to complete my T1 yesterday, after receiving a couple of > missing > 1/8 watt resistors from Elecraft. Everything worked right away. Happy > Dance > time.. > > Then today..I receive another envelope from Elecraft with Errata... John, Some kits were shipped before the final errata went out, and yours was one of them. Sorry for the inconvenience. 73, Wayne N6KR --- http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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In reply to this post by W2AGN
John, W2AGN wrote:
I was pleased to complete my T1 yesterday, after receiving a couple of missing 1/8 watt resistors from Elecraft. Everything worked right away. Happy Dance time.. Then today..I receive another envelope from Elecraft with Errata, changing R1 and R2 to 1 watt, and T2 to 2 stacked cores. Oh Joy, now I get to take it all apart, desolder the resistors and T2, all while trying not to melt anything I shouldn't. ------------------------------------------ Hi, John: That change was to beef up the bridge circuit transformer. After really beating up some T1's to see what they'd take, it was found the original transformer can run warm enough to cause the bridge of work incorrectly under some conditions on the lower bands. Those two resistors are very easy to get to. Remove T2 first and you'll find one of them right next to the row of inductors near the BNC end on top of the board, and the other one on the bottom of the board near the edge between the BNC connectors. They are well away from any sensitive relays or other such parts. You'll find T2 with two stacked cores a tight fit, but it does fit FB and will run very cool under all normal conditions on any band. Follow the procedure in the errata in which you solder one end of the green primary winding in before installing the transformer and it'll go in easily. BE SURE to wind T2 with EIGHT turns. I understand that a few of the errata sheets may have escaped saying seven by mistake. That transformer gets EIGHT turns just as shown in the picture and the same as in the original T2 you are removing. Now your T1 will be even more robust than ever. In spite of the embarrassment and cost to Wayne and Eric to deliver a change so quickly, it wasn't an option to ignore that weakness in the T1. It's now the Elecraft way. Indeed, they were scrambling over the holiday weekend to get the change out ASAP. You get a stronger, better tuner as a result. Ron AC7AC _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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On Friday 01 April 2005 12:39, Ron D'Eau Claire wrote:
> Those two resistors are very easy to get to. Remove T2 first and you'll > find one of them right next to the row of inductors near the BNC end on top > of the board, and the other one on the bottom of the board near the edge > between the BNC connectors. They are well away from any sensitive relays or > other such parts. > > You'll find T2 with two stacked cores a tight fit, but it does fit FB and > will run very cool under all normal conditions on any band. Follow the > procedure in the errata in which you solder one end of the green primary > winding in before installing the transformer and it'll go in easily. > > BE SURE to wind T2 with EIGHT turns. I understand that a few of the errata > sheets may have escaped saying seven by mistake. That transformer gets > EIGHT turns just as shown in the picture and the same as in the original T2 > you are removing. > > Now your T1 will be even more robust than ever. > > In spite of the embarrassment and cost to Wayne and Eric to deliver a > change so quickly, it wasn't an option to ignore that weakness in the T1. > It's now the Elecraft way. Indeed, they were scrambling over the holiday > weekend to get the change out ASAP. You get a stronger, better tuner as a > result. > > Ron AC7AC Well, I just finished doing the changes and everything is OK. Didn't melt anything, and everything fits, and the T1 still works! I wasn't picking on Elecraft, just noting that I am not one that should be given an extra opportunity to screw up! My main complaint about the T1 is...why didn't they come out with it sooner? It is the neatest, handiest little tuner I have ever seen! -- John W2AGN http://w2agn.net _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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In reply to this post by Ron D'Eau Claire-2
Ron D'Eau Claire wrote:
> Now your T1 will be even more robust than ever. How hard would it be to beef up a T1 to handle 100W? A few extra cores, bigger wire, higher voltage caps.... ..from the one who used to run his QRP K2 at 22 watts output. -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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In reply to this post by W2AGN
On Friday 01 April 2005 13:54, you wrote:
> Hi John, > > > the T1 still works! > > That's a relief.... > > > My main complaint about the T1 is...why didn't they come out with it > > sooner? > > It is the neatest, handiest little tuner I have ever seen! > > Glad you like it, and tell your friends :) I was looking at the LDG > Z100 sitting on top of an FT-817 in a photo, and I suddenly realized > that no one made a really compact low-power tuner. > > A few reviews of the tuner have been posted at: > > http://www.eham.net/reviews/detail/4956 > > This would be a good place to comment to the world at large about the > T1, should you feel so moved. > I would love to, but AB7RG, one of the "poobahs" of Eham.net banned me from posting anything on Eham. Actually, it was because I spoke in the defense of another Elecraft list member who had an article turned down by Eham because it was too "pro-K2." This same guy threw me off the TenTec list some time ago, again, for commenting that the K2 was superior to the Argonaut V. So, He actually put in my "Eham profile" that one of my other hobbies was "making trouble on Eham.net," and banned me from posting anywhere on Eham. I could get around it with a phoney login, etc., but why bother? These folks aren't worth it. -- John W2AGN http://w2agn.net _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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In reply to this post by Vic K2VCO
Vic, K2VCO, asked:
How hard would it be to beef up a T1 to handle 100W? A few extra cores, bigger wire, higher voltage caps.... --------- That's a question for Wayne! Ron AC7AC _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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The relays and inductors would have to be increased substantially in
size. That's why a KAT100 is a lot bigger than a T1 ;) 73, Wayne On Apr 1, 2005, at 12:19 PM, Ron D'Eau Claire wrote: > Vic, K2VCO, asked: > > How hard would it be to beef up a T1 to handle 100W? A few extra > cores, > bigger > wire, higher voltage caps.... > > --------- > > That's a question for Wayne! > > Ron AC7AC --- http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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