[R-390] Collins Mechanical Filters

[Craig C. Heaton]

	In the past I've come across some great material on this e-mail reflector.
Now, it is my turn to share. Since there is only one receiver in the shack,
a R-390/A, my experience isn't as great as others posting here. But, I've
got some information to pass on. With out much effort, tools, or experience,
I managed to open a Collins Mechanical Filter (2KC) from my R-390/A without
damage. It can be fixed.

	Because, I've been unable to find drawings, photographs, or any real
information pertaining to the construction of these filters; here is a link
to a little website I've put together. It tells how to open a Collins
Mechanical Filter for a R-390/A and includes photos.
If I can find some finer than frog's hair wire, I'll post more.

	One last tid-bit, if you have never removed the 2KC filter from the IF
deck, you haven't lived. In the event you want to try, I can describe how to
avoid the pitfalls. Might add that to the website later after repairing the
coil.

   http://collinsfilter.tripod.com

	Please forgive those damn popups, and trash ads. The site is free.

73's
wd8kdg
Craig

And yes, copy anything your little heart desires.