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CUSTOM CRYSTAL MANUFACTURERS/ SUPPLIERS

unit_399

EL CAPO
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Jun 17, 2008
2,321
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ALEJANDRIA, COLOMBIA SA
I'm working on several old crystal-controlled 23 channel AM/SSB radios and want to convert them to 40 channel. I need to get four fundamental cut crystals 12.000mhz, 12.050mhz , 13.000mhz, and 13.050mhz in an HC18U or HC25U package. Are there any companies still producing custom crystals ?? If not, whats my best alternative ??

J.J. 399
 
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Possible alternative is to use a microcontroller and a Si5351 to generate a desired frequency followed by an either an amplifier stage or just a buffer depending on what's needed to get the right signal level. You may also need a filter to get the signal to look more like sine wave than square wave. Microcontroller would have to be wired into the channel selector to know what frequency to generate at any given time, of course.

Or just buy/build a VFO and call it good.

I'd still go with a crystals if you can find them, though. A lot less work that way.
 
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Seconded on the micro and one of those little purple Si5351 boards. We had a Kraco base done that way a couple of years back, works great and covers 120 channels (40 up and 40 down) with 10k and 5k drop switches.

It's been my daily driver base since then, works great and less noise than the current chinese things around now. The tech that did ours is not currently doing any radio work but should be happy to provide details if you want to go that way.

Sorry for low quality pics, 10 year old samsung phone camera is a bit crusty by iphone standards.
 

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Possible alternative is to use a microcontroller and a Si5351 to generate a desired frequency followed by an either an amplifier stage or just a buffer depending on what's needed to get the right signal level. You may also need a filter to get the signal to look more like sine wave than square wave. Microcontroller would have to be wired into the channel selector to know what frequency to generate at any given time, of course.

Or just buy/build a VFO and call it good.

I'd still go with a crystals if you can find them, though. A lot less work that way.
Buy NOS at Kens Electronics.
 
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