Thanks Bob! I bet this is it. At midnight I was beginning to go cross eyed. I must have missed the internal tooth lock washers! Better RF ground this way as well.
Thanks Gang! 73, Rodger N4NRW ---- Original message ---- >Date: Wed, 30 Jul 2008 07:06:04 -0500 >From: "Bob Serwy" <[EMAIL PROTECTED]> >Subject: RE: [Elecraft] K3 Assembly issue with bottom Heat Sink cover! >To: <[EMAIL PROTECTED]> > >According to the assembly manual page 55, The NOTE states "The three screws >marked "A" must be "1/4" black pan head with inside tooth lock washers under >the screw heads." > >Also read the CAUTION. > > >Bob Serwy - N9RS > >-----Original Message----- >From: [EMAIL PROTECTED] >[mailto:[EMAIL PROTECTED] On Behalf Of >[EMAIL PROTECTED] >Sent: Wednesday, July 30, 2008 6:51 AM >To: [email protected] >Subject: [Elecraft] K3 Assembly issue with bottom Heat Sink cover! > >Hey gang, > >Just spent 4 hours assembling K3 s/n 1318 and all went well except for one >slight but potentially serious hardware problem. When installing the bottom >heat sink cover over the LPA I noticed that the required 4-40 x 1/4" screws >bottomed out in the standoffs under the TO-220 LPA transistors before they >would compress the cover to the transistors (and yes I can measure screw >lengths). This will leave a gap between the transistor and the heatsink and >not provide proper heat sinking! It is strange to note that one of the >Manual Errata changes was to point out that the heat sink cover was >"slightly" thicker than the other bottom cover. Wonder if this part has >changed? Any way, I added 3 #4 stainless steel flat washers under the screw >heads and that allows the screws to fully compress the heat sink against the >transistors. For a belts and suspenders fix I also added a dab of heat sink >compound to the transistors as well. I did not check the screws coming from >the top side of t! >! >he LPA assy to see if the factory may have used the wrong/longer screws >taking up extra standoff threads. A #4 split washer could have also been >left off of this top side screw and create the same issue or tol. stack up >of the parts? > >Any way HEADS UP! > >73, > >Rodger >N4NRW >_______________________________________________ >Elecraft mailing list >Post to: [email protected] >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: [email protected] 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
