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Old 17th February 2012, 05:17 PM   #1
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Default Crystal?

Anyone know what crystal is this? It's in a FM mic receiver...
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Old 17th February 2012, 05:30 PM   #2
DF96 is offline DF96  England
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My guess is 74.200MHz. Probably third or fifth overtone, which presumably means series resonance.
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Old 17th February 2012, 06:03 PM   #3
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Great! I suspected it was a 74,2 kHz crystal, but I can't find it in stores...
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Old 17th February 2012, 06:11 PM   #4
Elvee is offline Elvee  Belgium
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Quote:
Originally Posted by DF96 View Post
My guess is 74.200MHz. Probably third or fifth overtone, which presumably means series resonance.
Yes, to be used after tripling in the LO of the receiver: (74.2 x 3) + 10.7 = 233.3
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Last edited by Elvee; 17th February 2012 at 06:28 PM.
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Old 17th February 2012, 06:14 PM   #5
DF96 is offline DF96  England
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74.2kHz would be a much bigger crystal.
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Old 18th February 2012, 03:15 AM   #6
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Quote:
Originally Posted by DF96 View Post
74.2kHz would be a much bigger crystal.
Oh oh oh I haven't read that! MHz? Should I ask it like that?
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Old 18th February 2012, 11:19 AM   #7
DF96 is offline DF96  England
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Sorry, I don't understand your comment. If you want a 74.2MHz crystal, then that is what you ask for. You would also need to specify case style. Many crystal manufacturers will know what each type of equipment needs, so tell them what it is for.
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