Crystal?

slideman82 · 17th February 2012, 05:17 PM

Anyone know what crystal is this? It's in a FM mic receiver...

DF96 · 17th February 2012, 05:30 PM

My guess is 74.200MHz. Probably third or fifth overtone, which presumably means series resonance.

slideman82 · 17th February 2012, 06:03 PM

Great! I suspected it was a 74,2 kHz crystal, but I can't find it in stores...

Elvee · 06:28 PM

Quote:

Originally Posted by DF96

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

DF96 · 17th February 2012, 06:14 PM

74.2kHz would be a much bigger crystal.

slideman82 · 18th February 2012, 03:15 AM

Quote:

Originally Posted by DF96

74.2kHz would be a much bigger crystal.

Oh oh oh I haven't read that! MHz? Should I ask it like that?

DF96 · 18th February 2012, 11:19 AM

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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17th February 2012, 05:30 PM	#2
DF96 diyAudio Member Join Date: May 2007	My guess is 74.200MHz. Probably third or fifth overtone, which presumably means series resonance.

17th February 2012, 06:03 PM	#3
slideman82 diyAudio Member Join Date: Oct 2007	Great! I suspected it was a 74,2 kHz crystal, but I can't find it in stores...

17th February 2012, 06:14 PM	#5
DF96 diyAudio Member Join Date: May 2007	74.2kHz would be a much bigger crystal.

18th February 2012, 11:19 AM	#7
DF96 diyAudio Member Join Date: May 2007	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.