K2 SN 192 ?
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I have a chance to buy a rather early K2 in unbuilt kit form. It's serial number 192. It has the SSB adaptor, Noise blanker, Audio filter, a set of pre-wound toroids and the Revision B boards and parts and updated manual. In doing some research on the WWW, I see there have been a number of changes/modifications over the years by the factory and others. I've run across alternate wiring for the AF gain and mention of a cure for BFO drift. Does someone have a list of the various changes that I should incorporate while building this rather early K2 should I decide to take the plunge and buy it?
Thanks & 73, Puck _______________________________________________ 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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It is a matter of price.
It can be built to be current. You may need some new parts from Elecraft. Look at LA3ZA's Unofficial Guide to Elecraft K2 Modifications. You can find it on Elecrafts website. You will get a feel of what you are up against. George _______________________________________________ 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 H. M. Motley, Jr,
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In reply to this post by George Victor-2
A few years ago I purchased an unbuilt K2 from eBay. It had a serial number in the 1300s. One of the best pieces of advice I got was to order a current (new) main PCB, and to incorporate all of the recommended upgrade kits during the build. The updated circuit board kit allowed me to incorporate the needed upgrades with minimal difficulty. A bit of study of the upgrades and modifications is needed to make sure that you don't end up "going backwards" by mistake, but even that was relatively easy. I think the item you need is called the "K2 rev A to rev B upgrade kit" - or something very much like that. Check the Elecraft web site for a better description, prices, and installations instructions. My K2 has since seen additional upgrades and additions, and is now a "current spec" radio that meets all of the performance requirements of the very latest models. In my opinion, the ability to keep any radio updated to "factory fresh" is the number one feature of all Elecraft products. Good luck with your new kit! - Jim, KL7CC _______________________________________________ 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 H. M. Motley, Jr,
Puck,
If the price is right, you can end up with a K2 that is an exact equal of the current shipped K2s. You did say it has the Rev B boards included, and that is the current ship level for the boards. I know you will need to order the Keying Waveshape Mod and a couple 1N4148 diodes over and above any kits associated directly with the A to B conversion. You will also have to inventory just which mod kits have been included with the A to B upgrade - there is the basic K2ATOBKT, but there are several 'optional' kits too (I don't consider them really optional for a complete job). Some of them may be included in the package he has, maybe not. In addition, you would want to order and use the newer spec'ed IF crystals (these were introduced after SN 2560), and you will want to be careful with the pre-wound toroids for a few have changed (L25, L26, T7 and T3 are the specific ones I recall). You may or may not have to order the newest firmware (I don't know which level he would have). All in all, it should be an easy task with the new set of boards - the AF Gain wiring changes are already on the new rev boards. It would actually be best if you built to the current manual instructions rather than either manual that might be included. Price-wise, the entire set of A to B mod kits (exclusive of the boards) total to less than $150 including the new firmware. With that as a consideration, you can intelligently negotiate the price. After you have the kit(s) in hand, we can help you sort out which of the mod kits are present and which need to be ordered. The task of getting everything straight may be a bit confusing at first, but once that accomplished, the build should be straightforward using the current manual. Note that with the purchase of the Rev B. boards, there should have been a new serial number too, and that serial number will be greater than 3000. 73, Don W3FPR H. M. Motley Jr. wrote: > I have a chance to buy a rather early K2 in unbuilt kit form. It's serial number 192. It has the SSB adaptor, Noise blanker, Audio filter, a set of pre-wound toroids and the Revision B boards and parts and updated manual. In doing some research on the WWW, I see there have been a number of changes/modifications over the years by the factory and others. I've run across alternate wiring for the AF gain and mention of a cure for BFO drift. Does someone have a list of the various changes that I should incorporate while building this rather early K2 should I decide to take the plunge and buy it? > > Thanks & 73, > Puck > > _______________________________________________ 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 H. M. Motley, Jr,
H. M. Motley Jr. wrote:
> I have a chance to buy a rather early K2 in unbuilt kit form. It's > serial number 192. It has the SSB adaptor, Noise blanker, Audio > filter, a set of pre-wound toroids and the Revision B boards and > parts and updated manual. In doing some research on the WWW, I see > there have been a number of changes/modifications over the years by > the factory and others. I've run across alternate wiring for the AF > gain and mention of a cure for BFO drift. Does someone have a list > of the various changes that I should incorporate while building this > rather early K2 should I decide to take the plunge and buy it? Hi Puck! If it has the rev B boards, etc., then hopefully what it is is a basic K2 plus the K2BCOMPKT kit and a couple of other things, which comprises what you need to bring it up to the level equivalent to serial no. 3000. For details, see <http://www.elecraft.com/order_form_parts.htm#K2BCOMPKT> This includes upgrade instructions. This includes the AF gain modification that you mentioned, and also a keying waveform improvement mod which was incorporated after serial no. 3000. Check with the seller (I think I have a suspicion about who it is!) and verify that it includes the stuff described in the link above. If so, you will probably not need to make any additonal modifications. -- 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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