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| 914werke |
 Jul 12 2020, 10:44 AM
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#1
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"I got blisters on me fingers"  Group: Members Posts: 10,066 Joined: 22-March 03 From: USofA Member No.: 453 Region Association: Pacific Northwest 
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(IMG:style_emoticons/default/biggrin.gif) so the dual tone horns on the early cars are pretty nice & LOUD, partly because of the combination of frequency's.
They can also be repaired when they stop working. (IMG:style_emoticons/default/smile.gif) But after refurbishing them, what do you use to calibrate them back to the 335 & 400Hz tones? (IMG:style_emoticons/default/confused24.gif) |
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| Superhawk996 |
Jul 12 2020, 11:11 AM
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#2
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914 Guru Group: Members Posts: 5,825 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch
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The easiest answer would be a microphone hooked up to an oscilloscope.
440Hz is a musical "A" note. Could potentially use an old school guitar tuner with a built in microphone to get to to A and then tune it by ear to be a little bit flat. There are now a number of clip on guitar tuners that might work too. Once you have the 400Hz (approxiate) horn set, the other would be tuned by ear to give a pleasant harmony. Alternatively, if you have a good horn, you can activate that one and tune the other to match. As the frequencies get close they will "beat" at the frequecny difference between them. Example a good horn at 400HZ and the one being tuned at 395Hz will "beat" at 5Hz as a wow - wow - wow kind of noise. When you no longer have the "beat" they are in tune with each other. Hard to describe in words. Here is a video of it. https://www.youtube.com/watch?v=rmvDu6EY2lE Regardless, I'd recommend that you not do it at midnight unless you hate your neighbors. (IMG:style_emoticons/default/happy11.gif) |
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| Montreal914 |
Jul 12 2020, 11:59 AM
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#3
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Senior Member Group: Members Posts: 1,560 Joined: 8-August 10 From: Claremont, CA Member No.: 12,023 Region Association: Southern California
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Frequency app on your phone? (IMG:style_emoticons/default/confused24.gif)
Guitar tuning app? |
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| 914werke |
Jul 12 2020, 12:54 PM
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#4
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"I got blisters on me fingers" Group: Members Posts: 10,066 Joined: 22-March 03 From: USofA Member No.: 453 Region Association: Pacific Northwest
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QUOTE(Montreal914 @ Jul 12 2020, 10:59 AM)  Frequency app on your phone? (IMG:style_emoticons/default/confused24.gif) DOH! (IMG:style_emoticons/default/sunglasses.gif) |
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| Superhawk996 |
Jul 12 2020, 02:26 PM
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#5
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914 Guru Group: Members Posts: 5,825 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch
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Double DOH!
I just looked and there are some pretty cool audio analyzers available. Way better idea than the guitar tuner. I was way too focused on the items I have easy access to. Nothing is easier than a phone app! |
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