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Registered Member #72
Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
ASHPoD wrote ...
Isn't (technically) the world's simplest frequency counter a crystal?
And how would you use a crystal as a frequency counter? Stare into it in a darkened room chanting 'Ommmm' and have the frequency come to you in a vision? I never did like the use of the the word 'technically', especially when my wife uses it, to mean 'please excuse me while I spout bollox'.
Registered Member #135
Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
I was wondering the same thing, although I was going to say it in a different, less harsh way:
"A crystal as a frequency counter? Please justify your reasoning."
I think what was intended, because I was blindsided by this statement as well, was that a simplistic frequency counter is a BFO, although it wasn't said that way. Beat Frequency counting, or harmonically mixing would be "simple" compared to a digital counter, BUT! and this is a big BUT!, you STILL need to have done alignments on the BFO BEFORE you can even start to use it! Which means you again need a calibrated source and some kind of meter, standard, or reference.
I have a BFO test set for TV service, a Simpson Genescope, which is a monster with AM and FM generators. Part of the TV alignment process is tuning the TV with the Genescope and getting a beat pattern on the CRO, then taking a dial reading (wich is already calibrated in Megacycles), and doing a calculation.
Failing that, if you wanted to be humorous, or an attempt at humor would have been to show a "reed type" frequency meter and call it a day. But that is not productive, nor relavent to forwarding the cause of this thread.
Registered Member #135
Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
Here we have the counter married to a VCO, and is now a portable microwave signal source, nearly complete, it just needs the stickers made up and it will be finished.
Registered Member #135
Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
1. Frequency out of the prescalar is 18.75 MHz max 2. Didn't have a week to play with code, I work full time. 3. I knew this way would work 4. I designed this frequency counter arrangement, so why not use it. 5. All parts are field replacable, a programed chip is not.
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World's Simplest Frequency Counter
