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Crystals wanted

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spuffock

Member
I need a couple of crystals, 7*5 mm. 13.56Mhz fundamental. There would be no problem getting a few thousand, but two?
Ideas,anyone?
 

stevez

Active Member
I've got some old WWII crystals that might be half that frequency. You might adjust them and double the frequency. Not sure what the application is but I could mail them to you. IM me if this might be a way.
 

Nigel Goodwin

Super Moderator
Most Helpful Member
Presumably they are for a specific purpose?, you may be able to source them along with the other components (such as the IC it's used with - assuming it is?). Failing that, and if you can't find it listed, there are a number of companies who will make specific crystals for you - in common use amongst radio hams.
 

spuffock

Member
We bought a car. The keyfob remotes didn't work. I had a look for them with the spectrum analyser, and found one of them about 371 MHz, the other about 384. Injecting 13.56MHz at the hot end of the crystal and pressing the button opens the car.
Sorry. the older crystals won't fit in the keyfob!
 

JimB

Super Moderator
Most Helpful Member
Quartz crystals, any frequency, one off quantities... no problem!

Look here: http://www.quartslab.com/

I have dealt with these guys in the past, no problem.

JimB
 

Shax

Member

mvs sarma

Well-Known Member
spuffock said:
I need a couple of crystals, 7*5 mm. 13.56Mhz fundamental. There would be no problem getting a few thousand, but two?
Ideas,anyone?

Hi Spuffock,
can you try 27.12Mhz and use a divider to derive what you want--probably you might get 27.xx crytals more easily.worst to worst, a 27.000 crystal cab be tuned at 27.12 by using a capacitor series to the crystal. then divide by '2'
 
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JimB

Super Moderator
Most Helpful Member
mvs sarma said:
Hi Spuffock,
a 27.000 crystal cab be tuned at 27.12 by using a capacitor series to the crystal.
No way!

A crystal will "pull" a couple of kHz at most. Not 120kHz.

JimB
 
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