A Bad Bad Crystal

[jackmarc]

Hi Guy's

Well... I finally found the source of glitching I had in my yak 54 "quote "." I had". I suspected it was from the receiver or the crystal. I took Terry T's advice to tap the receiver. Low and behold there it was.I swapped crystals back and forth several times to confirm it A little accepted advice can go a long way Thanks Terry. This was the crystal from my crashed extra 260. Live and learn. It makes me wonder if that was also the cause of the minor glitching the extra had.I'll never know for sure

If anyone is interested I could bring it to the next meeting for Show & Tell and demonstration. Let me Know!

PS Waiting for a nice day to fly my newly finished Showtime 50

This is just plane fun
jack

[johnm]

Jack: I think it would be interesting to show how you determined that you had a bad crystal at the February meeting. Unfortunately, I will not be able to attend. If I was able to attend, I would bring along a receiver that I found out to defected early last season. I was very fortunate and did not crash but my suspicious were aroused early in the flight and I landed safely. A fellow modeller, who is good with electronics, told me how to test (without the aid of expensive equipment) and sure enough using his simple test, the receiver proved itself to be a problem compared to one that I new for sure was good. Cheers - John Mickle

[robweiss]

Jack, I would also be interested in seeing how you checked your Xtal.

John, maybe you could start another thread and explain more on how you were told to test your receiver so that we all will be able to check our equipment. I know I would appreciate it that is for sure.

Rob

[jbajkor]

A word of warning about crystals.
Dual conversion recievers can have up to 4 more crystals inside! Some of these will be ceramic so are not as prone to damage. Futaba has short crystals inside that are the same type as those you can replace. The moral is... send your reciever in for repair after a crash, even if it appears ok.

If I suspect a crystal, this is how I check it:
I have an old jig saw that vibrates like the thingyens and has arcing brushes. I hold the suspect reciever against it and run it up for a few seconds. A bad crystal will show itself right away. A good reciever will not glitch at all, even under this harsh test.

Joe