Re: Which Mods are applicable?
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Jim,
I have just finished K2 #4687 with KPA100, DSP, 160M, SSB and NB. My kit came with all required mods already in the parts package. All I needed to do was to update the construction manual with written notes found on the included Errata sheets. Elecraft included one Mod bag of parts for either the DSP or KPA100 (I don't remember which one) which I THOUGHT needed to be installed, but after realizing I was replacing a capacitor with the exact same capacitor (I'm slow sometimes), I realized the corrected parts were already incorporated into the regular parts inventory. The only part I had to replace which can be called a mod, was C71 in the KPA100. As luck (or incredible planning on Elecraft's part) would have it, the .1uF capacitor needed for C71 was a spare left over from one of the other accessories. My point is: I wouldn't worry about those "optional" mods until you get the rig together. Elecraft has done a great job of getting an up-to-date kit in your hands so that you don't have to worry. Have fun! Bob K5WA ************************* <How does one determine which should/need be purchased? <If needed why are they not included with the <appropriate kit? It appears I could spend a hundred <dollars or more on modifications to make a new radio <work. That could wreck my radio budget. <Thanks for the help, <Jim, AB0UK _______________________________________________ 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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Hhmmm. This is the second time today that I have seen the C71 reference on
the KPA100 board. I am in the process of building my KPA100. Do I need to replace this cap now before I go any further? I don't have a DSP unit, but will be adding it later. I would rather do the mod now than have to take it apart and do it later. What do ya'll think? Stan Rife W5EWA Houston, TX K2 S/N 4216 -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of Bob Evans Sent: Friday, January 28, 2005 12:33 PM To: [hidden email] Subject: [Elecraft] Re: Which Mods are applicable? Jim, I have just finished K2 #4687 with KPA100, DSP, 160M, SSB and NB. My kit came with all required mods already in the parts package. All I needed to do was to update the construction manual with written notes found on the included Errata sheets. Elecraft included one Mod bag of parts for either the DSP or KPA100 (I don't remember which one) which I THOUGHT needed to be installed, but after realizing I was replacing a capacitor with the exact same capacitor (I'm slow sometimes), I realized the corrected parts were already incorporated into the regular parts inventory. The only part I had to replace which can be called a mod, was C71 in the KPA100. As luck (or incredible planning on Elecraft's part) would have it, the .1uF capacitor needed for C71 was a spare left over from one of the other accessories. My point is: I wouldn't worry about those "optional" mods until you get the rig together. Elecraft has done a great job of getting an up-to-date kit in your hands so that you don't have to worry. Have fun! Bob K5WA ************************* <How does one determine which should/need be purchased? <If needed why are they not included with the <appropriate kit? It appears I could spend a hundred <dollars or more on modifications to make a new radio <work. That could wreck my radio budget. <Thanks for the help, <Jim, AB0UK _______________________________________________ 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 _______________________________________________ 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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Hi All,
My K2 will be in the post soon. Meanwhile I have been avidly reading in readiness for the build. One mention of this mod refers to C72, many others like Stan & Jim refer to C71. Checking the schematic for the KPA100, C71 is listed as 0.0018uf decoupling RFC3 to ground and C72 0.01uF decouples the gate of Q6 if I read it right. Can someone please check this out before I need to get a solder sucker out!! 73 to all, thanks for the excellent reflector and those at Elecraft for the excellent manuals. Looking forward to joining you with the build and on the air. Ted Turk G7BQM On 29 Jan 2005, at 00:25, Stan Rife wrote: > Hhmmm. This is the second time today that I have seen the C71 > reference on > the KPA100 board. I am in the process of building my KPA100. Do I need > to > replace this cap now before I go any further? I don't have a DSP unit, > but > will be adding it later. I would rather do the mod now than have to > take it > apart and do it later. What do ya'll think? > > Stan Rife > W5EWA > Houston, TX > K2 S/N 4216 > > > -----Original Message----- > From: [hidden email] > [mailto:[hidden email]] On Behalf Of Bob Evans > Sent: Friday, January 28, 2005 12:33 PM > To: [hidden email] > Subject: [Elecraft] Re: Which Mods are applicable? > > Jim, > > I have just finished K2 #4687 with KPA100, DSP, 160M, SSB and NB. My > kit > came with all required mods already in the parts package. All I > needed to > do was to update the construction manual with written notes found on > the > included Errata sheets. Elecraft included one Mod bag of parts for > either > the DSP or KPA100 (I don't remember which one) which I THOUGHT needed > to be > installed, but after realizing I was replacing a capacitor with the > exact > same capacitor (I'm slow sometimes), I realized the corrected parts > were > already incorporated into the regular parts inventory. The only part > I had > to replace which can be called a mod, was C71 in the KPA100. As luck > (or > incredible planning on Elecraft's part) would have it, the .1uF > capacitor > needed for C71 was a spare left over from one of the other accessories. > > My point is: I wouldn't worry about those "optional" mods until you > get the > rig together. Elecraft has done a great job of getting an up-to-date > kit in > your hands so that you don't have to worry. > > Have fun! > > Bob K5WA > > ************************* > > <How does one determine which should/need be purchased? > > <If needed why are they not included with the > > <appropriate kit? It appears I could spend a hundred > > <dollars or more on modifications to make a new radio > > <work. That could wreck my radio budget. > > <Thanks for the help, > > <Jim, AB0UK > > > > > > _______________________________________________ > 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 > > _______________________________________________ > 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 > _______________________________________________ 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 |
Re: Re: Which Capacitor is it?
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Welcome Ted,
Sorry, biut I cannot help on this one as I have yet to find out what it is all about. The old problem, time !! Have fun building and then using your KPA/100, I'm sure you will. Mine went together like a piece of cake thanks to the great job done at Elecraft. And the folk on the reflector are of the best, great guys and girls, and of great help. Hope to work you when you are not busy working far and wide ! 73, Geoff. GM4ESD K2/100 #3255 ----- Original Message ----- From: "Ted Turk" <[hidden email]> To: <[hidden email]> Sent: Saturday, January 29, 2005 9:00 AM Subject: Re: [Elecraft] Re: Which Capacitor is it? > Hi All, > > My K2 will be in the post soon. Meanwhile I have been avidly reading > in readiness for the build. One mention of this mod refers to C72, > many others like Stan & Jim refer to C71. Checking the schematic for > the KPA100, C71 is listed as 0.0018uf decoupling RFC3 to ground and > C72 0.01uF decouples the gate of Q6 if I read it right. Can someone > please check this out before I need to get a solder sucker out!! > > 73 to all, thanks for the excellent reflector and those at Elecraft for > the excellent manuals. Looking forward to joining you with the build > and on the air. > > Ted Turk G7BQM > > _______________________________________________ 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 Ted Turk
Ted and all,
It is C72 - originally a 0.01uF located at the gate of Q6. Should you doubt it, I can supply the confirming e-mail 'from the horse's mouth' when I first asked that same question. I do not yet know if this is a recommended change or if it is only to be applied when the 'click on un-mute' problem rears its ugly head - you will have to query Wayne, Eric, and Gary (and possibly Lyle) on that point. 73, Don W3FPR ----- Original Message ----- > > My K2 will be in the post soon. Meanwhile I have been avidly reading in > readiness for the build. One mention of this mod refers to C72, many > others like Stan & Jim refer to C71. Checking the schematic for the > KPA100, C71 is listed as 0.0018uf decoupling RFC3 to ground and C72 > 0.01uF decouples the gate of Q6 if I read it right. Can someone please > check this out before I need to get a solder sucker out!! > > 73 to all, thanks for the excellent reflector and those at Elecraft for > the excellent manuals. Looking forward to joining you with the build and > on the air. > > Ted Turk G7BQM > > On 29 Jan 2005, at 00:25, Stan Rife wrote: > >> Hhmmm. This is the second time today that I have seen the C71 reference >> on >> the KPA100 board. I am in the process of building my KPA100. Do I need to >> replace this cap now before I go any further? I don't have a DSP unit, >> but >> will be adding it later. I would rather do the mod now than have to take >> it >> apart and do it later. What do ya'll think? >> >> Stan Rife >> W5EWA >> Houston, TX >> K2 S/N 4216 >> >> >> -----Original Message----- >> From: [hidden email] >> [mailto:[hidden email]] On Behalf Of Bob Evans >> Sent: Friday, January 28, 2005 12:33 PM >> To: [hidden email] >> Subject: [Elecraft] Re: Which Mods are applicable? >> >> Jim, >> >> I have just finished K2 #4687 with KPA100, DSP, 160M, SSB and NB. My kit >> came with all required mods already in the parts package. All I needed >> to >> do was to update the construction manual with written notes found on the >> included Errata sheets. Elecraft included one Mod bag of parts for >> either >> the DSP or KPA100 (I don't remember which one) which I THOUGHT needed to >> be >> installed, but after realizing I was replacing a capacitor with the exact >> same capacitor (I'm slow sometimes), I realized the corrected parts were >> already incorporated into the regular parts inventory. The only part I >> had >> to replace which can be called a mod, was C71 in the KPA100. As luck (or >> incredible planning on Elecraft's part) would have it, the .1uF capacitor >> needed for C71 was a spare left over from one of the other accessories. >> >> My point is: I wouldn't worry about those "optional" mods until you get >> the >> rig together. Elecraft has done a great job of getting an up-to-date kit >> in >> your hands so that you don't have to worry. >> >> Have fun! >> >> Bob K5WA >> >> ************************* >> >> <How does one determine which should/need be purchased? >> >> <If needed why are they not included with the >> >> <appropriate kit? It appears I could spend a hundred >> >> <dollars or more on modifications to make a new radio >> >> <work. That could wreck my radio budget. >> >> <Thanks for the help, >> >> <Jim, AB0UK >> >> >> >> >> >> _______________________________________________ >> 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 >> >> _______________________________________________ >> 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 >> > > _______________________________________________ > 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 > _______________________________________________ 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 Ted Turk
Ted Turk wrote:
> My K2 will be in the post soon. Meanwhile I have been avidly reading in > readiness for the build. One mention of this mod refers to C72, many > others like Stan & Jim refer to C71. Checking the schematic for the > KPA100, C71 is listed as 0.0018uf decoupling RFC3 to ground and C72 > 0.01uF decouples the gate of Q6 if I read it right. Can someone please > check this out before I need to get a solder sucker out!! When I asked Gary about this, he said 'either C71 or C72'. Since C71 was a 200V capacitor, I chose to increase the value of C72 from 0.01 uf to 0.1 uf. It definitely had an effect on the problem. But -- it's not entirely gone! So this afternoon I will see if upping C71 has some effect. -- 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 the words of the immortal Ron Ziegler*, my previous comments on this subject
are "inoperative at the present time." Here is what I determined today: Problem: some K2/100s produce a large click in the headphones or speaker on unmute. The click requires that the power be set to at least 11 watts, and the DSP to be active (not in bypass mode). No RF needs to be generated (test mode can be set). The t-r menu parameter is set to 0. Solution (for my k2/100, anyway): change BOTH C72 (originally 0.01 uf) and C71 (originally 0.0018 uf) to 0.1 uf. Note that C71 is a 200v cap. Changing C71 by itself reduces the click but doesn't eliminate it. Changing C72 by itself appears to have no effect. Changing them both makes it totally go away. Your mileage definitely may vary; some K2/100s do not have the problem at all. * Ron Ziegler was press secretary in the Nixon administration. -- 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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