[R-390] 17 MHz Crystal

[Bob Camp]

Hi

This may work for pressure holder / FT-243 type crystals. It's not a real good idea on a solder sealed crystal like the 17 MHz part in the R-390A. The 17 MHz blank is so thin that anything close to a toothbrush will destroy it.

Bob

On May 14, 2013, at 9:47 AM, Steve Hobensack <stevehobensack at hotmail.com> wrote:

> Usually a bad crystal can be repaired. dismantle and remove the crystal. Soak everything is soap and water. I have found that degreaser spray does not work as good as soap and water. Use a toothbrush. rinse several times, final rinse use distilled water. Also check electrical continuity between the pins and contact plates. Dry the crystal with a clean cotton dish towel. Use a hair dryier on the holder. It works most of the time for me. It even improves chirpy/lazy crystals.
> Steve N8YE 		 	   		  
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