It is a very long time since I was fit enough to do serious project building work, but I know that buying crystals, unless you are buying very common frequencies, is expensive. Many now use synthesised sources instead as this can be much less expensive. Sadly, health issues have precluded me doing my own experiments. At one time, synthesised sources could be noisy, although I expect things have improved in the last 10 years. If you have used synthesised "crystal replacements" I'd be interested to hear what good solutions there are now.
Many years ago, I had ideas for a low cost 10m DSB rig. With the sunspot count likely to soon be on the up, perhaps it is time to dust this off.
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