Re: [Elecraft] Spare parts for K2
Hi Jean, I agree with Don. I would stock some 2N7000 mosfet which are easily damaged by ESD. Ocassionally, I built K2 on behalf of some hams. I experienced two failed 2N7000 when I constructed one KPA/100 and one K2 in the past. If you want to build another K2 in future, you may wish to stock a few 2N7000. They are cheap and only cost USD0.5 in Hong Kong. 73 Johnny Siu VR2XMC - Original Message - From: "JEAN-FRANCOIS MENARD" <[EMAIL PROTECTED]> Cc: Sent: Saturday, June 26, 2004 12:30 AM Subject: Re: [Elecraft] Spare parts for K2 Yes you're right maybe someday I'll buy another K2 I'm planning anyway to buy another one that will stay in my shack with the PA 100W I'm really enjoying this rig... It's a good thing also to have problem sometime make me learn a lot !!! ;-) But no too often... ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraftHelp: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
RE: [Elecraft] Spare parts for K2
Another op I know lost a bypass cap recently. It shorted, which took out >an IC relay driver. It really screwed up the relay band-switching and it took him some head-scratching and good detective work to realize what had happened. All he could see was that the power out was lousy on some bands. Still that's VERY rare. He asked me for ideas and a shorted bypass never occurred to me. This happened to me too so it can't be that rare! The other spare I've needed was a headphone socket. They take mini-jacks but if, like me you use an adapter to a full size jack, they break. Mine took about a year. Obviously I now only use mini jacks. I would guess this isn't that rare either because it is a spare item on the Elecraft site. In general I very much agree that things electronic don't wear out. Andrew MIKAZ k2# 3679 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraftHelp: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Spare parts for K2
Yes you're right maybe someday I'll buy another K2 I'm planning anyway to buy another one that will stay in my shack with the PA 100W I'm really enjoying this rig... It's a good thing also to have problem sometime make me learn a lot !!! ;-) But no too often... Le 04-06-25, à 11:44, Ron D'Eau Claire a écrit : FB about getting a new Q7, Jean-François! As for spares... Over the years, I have always kept a spare "final" or "finals" around ever since my 'final' was a 6L6 or 807 vacuum tube. If something was going to "blow" due to carelessness or the strain of regular use, it'd be the "final". In 1977 - more than a quarter century ago - I built a Heath HW-8 transceiver. The other day I was digging around in my semiconductor stock and came across an envelope marked "Spare HW-8 Final". The message is that it's been over a quarter century since I've "blown" a final. Once you have the rig up and running, just about the only thing that's going to fail is something that you break by having an accident - like the probe slipping (You made me wince with that story. I suspect that most of us has done that at least once!). Still, if you're going to have something quit in 'normal' operation, it's most likely one of the 'final' transistors. If you stock one, stock a set. And it's quite unlikely that they will die. The only real danger is if you don't mount the heat sink correctly or run the rig at too high a power for too long. Keep in mind the 10 watt rating for the K2 and the 100 watt rating for the K2/100 are for CW or SSB, not digital modes. CW/SSB has a lower 'duty cycle' since the key is "up" or you aren't constantly talking so the average power is well below 10 or 100 watts. Another op I know lost a bypass cap recently. It shorted, which took out an IC relay driver. It really screwed up the relay band-switching and it took him some head-scratching and good detective work to realize what had happened. All he could see was that the power out was lousy on some bands. Still that's VERY rare. He asked me for ideas and a shorted bypass never occurred to me. My ol K2/100 (S/N 1289) has been working without a hitch for over 3 years, in spite of being torn down dozens of times to make mods or do testing of new mods. So if you want to avoid being off the air unexpectedly at any time, maybe the best "spare" is a "spare" K2... Or perhaps a KX1 . 73, Ron AC7AC -Original Message- Does somebody have any suggestion of a list of parts considered "a must" in my spare parts package for my K2 I would like to store at home ??? For sure Q7 (2SC1969) is in my kit !!! === Jean-François Ménard / VA2VYZ [EMAIL PROTECTED] ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net http://mailman.qth.net/mailman/listinfo/elecraft You must subscribe to post. Subscriber Info (Addr. Change, Unsub etc): http://mailman.qth.net/subscribers.htm Elecraft page: http://www.elecraft.com === Jean-François Ménard / VA2VYZ [EMAIL PROTECTED] Club d'Astronomie Amateur de Sherbrooke Club Radio Amateur de l'Estrie Mon site web personnel : http://homepage.mac.com/jfmenard === ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraftHelp: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
RE: [Elecraft] Spare parts for K2
FB about getting a new Q7, Jean-François! As for spares... Over the years, I have always kept a spare "final" or "finals" around ever since my 'final' was a 6L6 or 807 vacuum tube. If something was going to "blow" due to carelessness or the strain of regular use, it'd be the "final". In 1977 - more than a quarter century ago - I built a Heath HW-8 transceiver. The other day I was digging around in my semiconductor stock and came across an envelope marked "Spare HW-8 Final". The message is that it's been over a quarter century since I've "blown" a final. Once you have the rig up and running, just about the only thing that's going to fail is something that you break by having an accident - like the probe slipping (You made me wince with that story. I suspect that most of us has done that at least once!). Still, if you're going to have something quit in 'normal' operation, it's most likely one of the 'final' transistors. If you stock one, stock a set. And it's quite unlikely that they will die. The only real danger is if you don't mount the heat sink correctly or run the rig at too high a power for too long. Keep in mind the 10 watt rating for the K2 and the 100 watt rating for the K2/100 are for CW or SSB, not digital modes. CW/SSB has a lower 'duty cycle' since the key is "up" or you aren't constantly talking so the average power is well below 10 or 100 watts. Another op I know lost a bypass cap recently. It shorted, which took out an IC relay driver. It really screwed up the relay band-switching and it took him some head-scratching and good detective work to realize what had happened. All he could see was that the power out was lousy on some bands. Still that's VERY rare. He asked me for ideas and a shorted bypass never occurred to me. My ol K2/100 (S/N 1289) has been working without a hitch for over 3 years, in spite of being torn down dozens of times to make mods or do testing of new mods. So if you want to avoid being off the air unexpectedly at any time, maybe the best "spare" is a "spare" K2... Or perhaps a KX1 . 73, Ron AC7AC -Original Message- Does somebody have any suggestion of a list of parts considered "a must" in my spare parts package for my K2 I would like to store at home ??? For sure Q7 (2SC1969) is in my kit !!! === Jean-François Ménard / VA2VYZ [EMAIL PROTECTED] ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net http://mailman.qth.net/mailman/listinfo/elecraft You must subscribe to post. Subscriber Info (Addr. Change, Unsub etc): http://mailman.qth.net/subscribers.htm Elecraft page: http://www.elecraft.com
Re: [Elecraft] Spare parts for K2
Thanks Don for your suggestion, This is a good starting point I'm agree that I don't need a lot of components, but a few basic and versatile to be commonly use in many other projects. And one other thing, all parts seems to be very common anyway in any good electronic store, or at least you will get it in a couple of days... 73 Le 04-06-25, à 11:11, Don Wilhelm a écrit : Jean-Francois, I would say to save your money - unless you want to accumulate some parts for other homebrew projects. Parts in the K2 rarely fail (almost never) unless they are abused in some way. The design point for the components is conservative and little stress is placed on them in normal usage. I have never had a component fail in a K2 in 5 years unless I 'slipped' with the probe - and if that happens, it is hard to say just what component will be zapped - it depends on where the probe was placed. If you insist, I would suggest buying some 2N7000 MOSFETs because they have very low gate current and can be used if you want to 'steal' a signal from inside the K2 without creating undue extra loading. They will handle up to 200 ma of drain current too, so they can drive a heavy load if required. Other good choices are 2N NPN transistors and 2N2906 PNP transistors which will give a good start for any junkbox. An assortment of 1/4 watt resistors and a stock of capacitors is always a good thing to have on hand. I keep every value resistor in the 10% value scale in stock and lots of .001, .01 and .1 capacitors as well as assorted smaller values. You can usually parallel capacitors to obtain the in-between values when needed. What you add to your parts selection does depend on the kind of circuits you are likely to build, but you can't go wrong with the above suggestions for a starting point. 73, Don W3FPR Life is what happens when you are making other plans - Original Message - Does somebody have any suggestion of a list of parts considered "a must" in my spare parts package for my K2 I would like to store at home ??? For sure Q7 (2SC1969) is in my kit !!! === Jean-François Ménard / VA2VYZ [EMAIL PROTECTED] Club d'Astronomie Amateur de Sherbrooke Club Radio Amateur de l'Estrie Mon site web personnel : http://homepage.mac.com/jfmenard === ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net http://mailman.qth.net/mailman/listinfo/elecraft You must subscribe to post. Subscriber Info (Addr. Change, Unsub etc): http://mailman.qth.net/subscribers.htm Elecraft page: http://www.elecraft.com
Re: [Elecraft] Spare parts for K2
Jean-Francois, I would say to save your money - unless you want to accumulate some parts for other homebrew projects. Parts in the K2 rarely fail (almost never) unless they are abused in some way. The design point for the components is conservative and little stress is placed on them in normal usage. I have never had a component fail in a K2 in 5 years unless I 'slipped' with the probe - and if that happens, it is hard to say just what component will be zapped - it depends on where the probe was placed. If you insist, I would suggest buying some 2N7000 MOSFETs because they have very low gate current and can be used if you want to 'steal' a signal from inside the K2 without creating undue extra loading. They will handle up to 200 ma of drain current too, so they can drive a heavy load if required. Other good choices are 2N NPN transistors and 2N2906 PNP transistors which will give a good start for any junkbox. An assortment of 1/4 watt resistors and a stock of capacitors is always a good thing to have on hand. I keep every value resistor in the 10% value scale in stock and lots of .001, .01 and .1 capacitors as well as assorted smaller values. You can usually parallel capacitors to obtain the in-between values when needed. What you add to your parts selection does depend on the kind of circuits you are likely to build, but you can't go wrong with the above suggestions for a starting point. 73, Don W3FPR Life is what happens when you are making other plans - Original Message - Does somebody have any suggestion of a list of parts considered "a must" in my spare parts package for my K2 I would like to store at home ??? For sure Q7 (2SC1969) is in my kit !!! ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net http://mailman.qth.net/mailman/listinfo/elecraft You must subscribe to post. Subscriber Info (Addr. Change, Unsub etc): http://mailman.qth.net/subscribers.htm Elecraft page: http://www.elecraft.com
