Re: [Elecraft] Variable Inductors Stuck
A tip passed on to me when I was having the same problems with some very small inductor cores in a commercial 2 way was to place a small amount of petroleum jelly on the thread topside of the core and carefully warm it with a heat gun or hair dryer before attempting to shift it. I've used this trick, or silicone spray, or Kroil (a pentrating oil). As stated, the slugs are very brittle. You may have to whittle a suitable adjusting tip. I've had some success, a few times, extracting a core where the adjustment hole has cracked and inverting it, so the remaining good end is usable. All in all, they can be a real pain. Don't force them, it just gets worse. I think that heat alone often helps the 'stuckness'. Note that many commercial rigs will have the slugs sealed in place with paraffin that seeps down into the threads... 73 de chris K6DBG ___ 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/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Variable Inductors Stuck
Hi Gary, A tip passed on to me when I was having the same problems with some very small inductor cores in a commercial 2 way was to place a small amount of petroleum jelly on the thread topside of the core and carefully warm it with a heat gun or hair dryer before attempting to shift it. It is very important to use the correct trimmer tool for moving inductor cores as some of the ferrite types are very brittle and unforgiving. Quite a lot of the small inductor cores also have a trimmer slot both sides which means the core can be reversed if one side gets broken or can be sometimes be accessed from the opposite side, though you cannot usually make much headway if the core splits. At this point the easiest option is to order a new variable inductor. The worst situation is if the inductor core jams solid and no spares are available. One way out at this point is to add another ferrite/iron dust core if the inductance is too low or a brass core if too high. Not a problem with Elecraft products, but what can be a solution with obsolete equipment when in that situation. Bob, G3VVT ___ 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/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] Variable Inductors Stuck
Hi. Im Building the xv222 which is supplied with three can type variable inductors (L15, 16, 17). The cores of the inductors are frozen near the top of the form. Manaual instructs to exercise the inductors before placement using the tuning shaft. Manual says they may be tight but they are frozen. any suggestion on how to loosen the cores without damaging them? Thanks Gary AA1UE ___ 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/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
