Dangit. I keep on running into the same problem...
Seems for radio use, crystals seems to be a problem. To get a specific frequency out of a radio, I need a specific crystal based on how the circuit is designed.
Well, I thought I was being smart and tried to design a synthesizer to get around needing these weirdly cut crystals, but I keep coming back to needing weird frequency crystals to simplify the design.
It seems like in the past, getting custom cut crystals is easier or something? Or perhaps it's typical to go to a crystal company to get specific crystals and have to order thousands of them? Or not?
Anyway, last night I was reading and found a solution to simplify my nasty PLL problem: divide by 277.7777 (which I did find a digital solution to come close enough to get 0.002% error. Unfortunately it is big and unwieldy, I would likely have to build it into a PLD to simplify things if I find a PLD that would run fast enough. It was unfortunate that simply dividing by 278 was too large of an error.)
However the solution required a single crystal of 4.551111 MHz (or an even harmonic of that)... except these too seem difficult to find and find cheaply. Any ideas?
Seems for radio use, crystals seems to be a problem. To get a specific frequency out of a radio, I need a specific crystal based on how the circuit is designed.
Well, I thought I was being smart and tried to design a synthesizer to get around needing these weirdly cut crystals, but I keep coming back to needing weird frequency crystals to simplify the design.
It seems like in the past, getting custom cut crystals is easier or something? Or perhaps it's typical to go to a crystal company to get specific crystals and have to order thousands of them? Or not?
Anyway, last night I was reading and found a solution to simplify my nasty PLL problem: divide by 277.7777 (which I did find a digital solution to come close enough to get 0.002% error. Unfortunately it is big and unwieldy, I would likely have to build it into a PLD to simplify things if I find a PLD that would run fast enough. It was unfortunate that simply dividing by 278 was too large of an error.)
However the solution required a single crystal of 4.551111 MHz (or an even harmonic of that)... except these too seem difficult to find and find cheaply. Any ideas?
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