Everyone knows that we hams SHOULD send in our elements when we
recrystal, so I'm not going to beat everyone to death on that....
Laryn, Since you said you have more than one element, try a different
one....
If that doesn't work, try Jeff DePolo's suggestion a few weeks ago from
MSG# 67916:
*BUT* You'll need a larger cap since you are too high in freq. A few
pF will make a big difference since the multiplication factor is 36.
/There is a fixed cap, typically in the range of 20 to 39 pF, located
more or less behind the trimmer. I can send you a pic if necessary to
confirm which cap it is. You'll need to replace that cap with a
different value (probably a few pF less if you're only 10 kHz off at
present). Usually this cap is NP0 temperature coefficient, but not
always. DO NOT put in some random cap with poor thermal stability; stick
with an NP0 and hope that it remains stable under temperature
variations. If you really want accurate compensation, you should send
the element to ICM and have them do it.
--- Jeff/
Hope this helps...
Kevin
Laryn Lohman wrote:
I just installed a new TX crystal into a KXN1052 channel element on a
Micor exciter today. The crystal is from ICM. It will not come on
channel. The ordered frequency is 445.125; it comes no closer than
445.1375. The crystal arrived late Friday PM, and upon installation
Friday evening, the problem was discovered.
I realize I may need to contact ICM when the office opens on Monday
since this is a new crystal. But, is there an easy and reliable way
to warp it down without the need to perhaps send the crystal back? A
small cap across the crystal?
Related question--why would a crystal from a reliable manufacturer be
off in the frist place. Are there tolerances in the channel element
that can sometimes add up the wrong way? I have some other elements
of the same number; is it worth trying the crystal in another one?
Laryn K8TVZ
