Help: Where Can I find tuning forks for freq of 500~800 hz.

[[email protected]]

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

 

[Bob]

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:

http://www.mypianoshop.com/store/home.php?cat=40

You could probably trim them to get the exact frequency you wanted, but I'm
not sure how well this would work.

Bob

 

[Eeyore]

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.

Are you sure you really want tuning forks ?
http://en.wikipedia.org/wiki/Tuning_fork

Graham

 

[Michael Black]

Are you sure you really want tuning forks ?
http://en.wikipedia.org/wiki/Tuning_fork

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

 

[Ken]

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

Just curious. Is there some reason you don't use an oscilloscope to
determine the frequency rather than a tuning fork??

 

[Tim Wescott]

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

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

 

[Michael Black]

Just curious. Is there some reason you don't use an oscilloscope to
determine the frequency rather than a tuning fork??

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

 

[Michael A. Terrell]

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?

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.

<http://www.google.com/search?num=10...YA:2006-31,GWYA:en&q=bramco+reeds&btnG=Search>


--
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

 

[Ken]

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

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.

 

[Rich Grise]

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?

The Bulova Accutron used a tiny metal tuning fork with coils, in an
oscillator.
http://www.allamericanwatches.com/site/626101/page/182611

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

 

[Al]

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:

http://www.omnivos.com/pc/0113/01/Resonator

Al

 

[Rich Grise]

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:

http://www.omnivos.com/pc/0113/01/Resonator

Well, I guess if you need a machine to "align your brain waves", money is
no object. ;-)

Cheers!
Rich

 

[Al]

Well, I guess if you need a machine to "align your brain waves", money is
no object. ;-)

Cheers!
Rich

Woowoowoowoowoowoowoowoowoo....

;-)

Al

 

[[email protected]]

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

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

 

[jasen]

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.

sounds like the electronic reed I saw in a ripple control relay.

Bye.
Jasen