Hello Group?
I am looking for the components, tuning fork, frequency of 502.5,
532.5......802.5hz range for maritime radio beacons. If anyone share a information about, who makes, where can I order..., I will be appreciated very much.Thanks, HWLEE
Musical tuning forks may get you close for some of the frequencies. They should be available in frequencies 440Hz * 2^(n/12) where n is a whole number (positive, zero, or negtive -- within reason).
For example:
A is 440.00Hz A# is 466.16Hz B is 493.88Hz C is 523.25Hz C# is 554.37Hz and so on.
However, I'm having a hard time finding chromatic sets (separated by the
12th root of 2 ratios) that are anything wider than from 261.6Hz to 523.3Hz. Here's a link:You could probably trim them to get the exact frequency you wanted, but I'm not sure how well this would work.
Bob
Are you sure you really want tuning forks ?
Graham
What kind of radio beacons are in the 500Hz range?
I think the poster is missing the "K" for KHz.
Whether or not he actually needs tuning forks, at least up there they'd be of reasonable size.
Michael
Just curious. Is there some reason you don't use an oscilloscope to determine the frequency rather than a tuning fork??
Whether you mean Hz or kHz, wouldn't you be better off using DSP or some other signal processing method that's more compact (and precise) than a bunch of tuning forks?
What, exactly, are you trying to do?
-- Tim Wescott Wescott Design Services http://www.wescottdesign.com Posting from Google? See http://cfaj.freeshell.org/google/ "Applied Control Theory for Embedded Systems" came out in April. See details at http://www.wescottdesign.com/actfes/actfes.html
That's interesting. I was reading "tuning fork" as in a frequency determining device. Don't some clocks (as in for reading time) use things referred to as "tuning forks" instead of crystals for keeping accurate time?
Michael
Those frequencies look like old pager or tone squelch fregencies. Motorola, Bramco and Ledex made the "reeds", which were mecahnicaly tuned, frequency selective relays. A simpler system was used for RC control, years ago.
-- Service to my country? Been there, Done that, and I've got my DD214 to prove it. Member of DAV #85. Michael A. Terrell Central Florida
Can't help you there, I know nothing about fancy clocks. I only have the cheap ones that either use the 60 cycle method or a crystal oscillator.
The Bulova Accutron used a tiny metal tuning fork with coils, in an oscillator.
You might be thinking of "tuning fork" crystals, were the crystal itself is in the shape of a tuning fork - that's how they can fit a 32.768KHz crystal into a can about the size of a tic-tac.
Cheers! Rich
There are such things as tunable tuning forks. I have seen them demonstrated. Moveable weights on the tines change the frequency. Here is one example, although an expensive one:
Al
Well, I guess if you need a machine to "align your brain waves", money is no object. ;-)
Cheers! Rich
Woowoowoowoowoowoowoowoowoo....
;-)
Al
No, I did not missing the unit "K", the frequency is hundred Hz order. It's a precision oscillating device work as x-tal oacillator, when you need precise oscillation on such low frequencies like 500Hz range stability of sub ppm , you need a part that I am looking for.
A radio beacon that using marine apprication use these oscillation source to generate group of precise tones, then the receiver discriminate tones to identify the beacons. This is looks like a small relay about 10mm x 10mm x 25mm, has 3pins.
Regards, HaeWoon
sounds like the electronic reed I saw in a ripple control relay.
Bye. Jasen
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