Chris and all, This is another one of those subjects that come up from time to time - and each time, the answer is -- Don't Worry -- Even if that VERY short varactor leg is connected inside (unlikely, but I don't really know), the insulation afforded by the RF Board masking is sufficient to provide adequate insulation. So just put those 1SV149s down close to the board - of course, don't force them and scrape off the PC board masking in the process - just use good old fashioned common sense.
73, Don W3FPR > -----Original Message----- > > You almost gave me a heart attack; I had just finished putting the > SV149s in #4768 this morning. I snugged them down tight to the board. So > I ran off to the bench and checked with the meter, but all mine are fine. > > I had assumed that the middle leg was just something left over from a > manufacturing run where they had used transistor tooling, but with a > transistor inside. Your comments made me think that maybe they are > transistors with a leg missing. > > Perhaps somebody who hasn't installed theirs yet could check with a > meter? Or does somebody know what is actually inside the package? > > Had to break off this afternoon to attend a nephews birthday party and > do some token woodworking in the bathroom that I am supposed to be > renovating, but got back to the bench this evening and have just > finished the crystals - first toroid winding session tomorrow. > > Chris VP8BKF > > PA2A Steef wrote: > > >Today I soldered the 6 MV209 varactor diodes and the 11 1SV149 > 's on the RF-board of my K2 #4654 According to the text on page > 50 the varactor diodes should be pressed all the way down on the > board to prevent stray signal coupling. The SV149 varactors may > have a center lead that has been cut flush with the body of the device. > > > >The center leads are clearly visible, about 0.5 mm coming out of > the varactor bodies! The soldering islands for the two varactor > leads have a very narrow gap, not more than half a mm on top of > the board. The center pin can easily short against one or even > both leads of the 1SV 149 's. I left them about one mm above the board. > > > > > _______________________________________________ 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
