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Author Topic: Singing Hamsticks  (Read 467 times)
KB9YAC
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Posts: 2




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« on: February 11, 2002, 11:28:20 AM »

I use Hamstick type antennas on the cab of my pickup truck with good success. The only problem is they start to sing (self resonate in the audio spectrum) at highway speeds. It sounds like a banshee at times. The mount is just one of those Tri-mag types. Anyone else experience "noisy" antennas and have an idea how to silence the beast?
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WB2WIK
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Posts: 20611




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« Reply #1 on: February 11, 2002, 03:01:15 PM »

You can change the resonant frequency by adding something to the whip that alters it physically.  If you wrap a piece of rope (like 1/4" nylon braided) around the stick (several turns, spread over some lenght of the whip), held securely in place with strong electrical tape, that should do it.

WB2WIK/6

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AD7DB
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Posts: 370


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« Reply #2 on: February 12, 2002, 01:17:21 PM »

I had a 5/8 wave 2M antenna on my car roof that would do that in a light breeze. Sounded like a ghostly harp, very eerie sounding when parked in a quiet place with a breeze blowing.  My current dual band 2m/440 roof antenna sometimes does it, but only in a heavier wind or at highway speeds, and then the sound pitch is a low hum but it's not bothersome at all.  Good luck in quieting your Caruso antenna.

Dave AD7DB
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KL7IPV
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Posts: 984




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« Reply #3 on: February 15, 2002, 11:34:04 PM »

Look at the new car antennas. They have the antenna wrapped so the wind is caused to spin as it hits the antenna. You can do the same by wrapping string from bottom to top and covering with shrink tubing. Should do the trick for ya.
73
Frank
KL7IPV
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W7KKK
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Posts: 374




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« Reply #4 on: February 22, 2002, 07:05:37 PM »

Try putting an aerodynamic shield of some sort over that tri mag mount. The sound you are hearing may not be the antenna. To find out, take the antenna off and try just the mount. I had one and it made one hell of a racket at 60 MPH.

73's Ken W7WV
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