All early radio equipment relied on crystals to operate on specific frequencies without drifting, hence the term 'crystal controlled' radio transmitters/transceivers/receivers. By the '70s radio equipment began to move away from crystal controlled transmitters/transceivers.
"A man is to be held accountable for the thoughts he chooses to entertain." --Richard Alan Miller
"If both the past and the external world exist only in the mind, and if the mind itself is controllable-what then?" --George Orwell
"It's not a matter of what is true (reality) that counts but a matter of what is perceived to be true (reality)." --Henry Kissinger
Amanda (24th May 2021)
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