[R-390] 7 Meg low sensitivity

[Tom Elmore]

  I often wonder if crystals can go weak? I have a Collins KWS-1 that shows
quite a bit of difference between the USB & LSB crystals positions. I have
checked all the caps and coils associated with the crystal oscillator with
my bridge and they check out.

Thank You
Thomas Elmore  KA1NVZ
Anchorage, Alaska


-----Original Message-----
From: r-390-bounces at mailman.qth.net
[mailto:r-390-bounces at mailman.qth.net]On Behalf Of
Flowertime01 at wmconnect.com
Sent: Sunday, July 29, 2007 5:10 PM
To: r-390 at mailman.qth.net
Subject: Re: [R-390] 7 Meg low sensitivity


Keith,

After the switch contacts are cleaned with some deoxit and if the problem
persists consider pulling the crystals and doing their contacts as well.

Back when (68-75) we did have crystals go weak and would replace them.
Just cleaning the contacts would not always bring a band back up to par but
a
new crystal would fix the problem.

I can believe the crystals are still going weak and causing problems.
We just all cannot have a spare set of crystals around to swap out and try
just to see if that's the problem.

If you have a one band problem ask here to see if you can get a known good
replacement to try. Postage and packing will cost more than the part.

Roger AI4NI   </HTML>
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