[NLRS] Crystals

[Doug Reed]

Please note that none of these vendors make compensated channel
elements like ICM did. ICM would sell you the loose crystal but for
triple(?) the price they would install the crystal, then recheck and
adjust the temperature compensation components in the channel element.
If you need a guarantee of temperature stability over the full temp
range, then buying a loose crystal might not solve the problem.

But you can probably do as well or better if you add some sort of
heater element to temp stabilize the crystal. You can try the old
school method using a 30-40 degree Celsius PTC heating resistor. Or
there are several precision heater options for $20 or less. The
original precision option was the Kuhne QH40A crystal heater, but I
find Janilabs selling a similar product.

<http://shop.kuhne-electronic.de/kuhne/en/shop/accessoires/crystal-heater/Precision+crystal+heater+40%C2%B0+QH40A/?card=724>
<http://janielectronics.com/index.php?route=product/product&product_id=117>
<http://www.setileague.org/askdr/xtaloven.htm>

73, Doug Reed, N0NAS.