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Amateur Radio Antennas - For discussion of all amateur band designed antennas and related accoutrements. This includes base, handheld, mobile and repeater usage. For commercial antennas on the amateur bands please use Commercial Radio Antennas below.

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Old 04-11-2017, 3:36 PM
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Default Broken Antenna Repair

I have a Comet tri-band antenna that was broken in shipment. The radio company replaced it immediately. I was told to hang on to the antenna while a claim was made against the shipper. The claim has apparently be paid but I still have the antenna. I assume they didn't want it.

It's a Comet SBB14 tri-band (52/146/446). Some still list the antenna as an SB14. The SBB has a different (and better) mounting structure.

Anyway, it's broken in two at the upper phasing coil. The antenna was 43" long. The upper phasing coil is broken in the middle, 34" from the base (leaving a 9" piece with half of the phasing coil attached).

Since the shipper apparently doesn't want the antenna, is there any way to salvage it? I hate to throw it away.
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Old 04-11-2017, 3:53 PM
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Call comet and purchase the broken part , i have repaired Diamond antennas before.
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Old 04-11-2017, 3:59 PM
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The antenna is broken in the middle of the coil. Half of the coil is on one piece of antenna and the other half is on the broken 9" tip. How would I repair that?
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Old 04-11-2017, 4:21 PM
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Quote:
Originally Posted by KK4JUG View Post
The antenna is broken in the middle of the coil. Half of the coil is on one piece of antenna and the other half is on the broken 9" tip. How would I repair that?
Some antennas have the coil molded onto the pieces and are not repairable while others are attached using set screws so it's easy to replace a broken coil by simply unscrewing the set screws, swapping out the coil, and tightening them back up. You may need to retune the antenna after the swap out though.
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Old 04-11-2017, 4:45 PM
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Conductive glue?
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Old 04-11-2017, 6:21 PM
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Conductive glue?
Would it be strong enough? That coil is mighty thin.
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Old 04-11-2017, 6:42 PM
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Some antennas have the coil molded onto the pieces and are not repairable while others are attached using set screws so it's easy to replace a broken coil by simply unscrewing the set screws, swapping out the coil, and tightening them back up. You may need to retune the antenna after the swap out though.
The upper part of the upper coil and the lower part of the lower coil have set screws for tuning. The other ends are molded onto the antenna element.
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Old 04-11-2017, 6:56 PM
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Would it be strong enough? That coil is mighty thin.
The glue comes in various strengths. Perhaps you can combine it with some kind of clamp.
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Old 04-11-2017, 9:40 PM
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I'm not sure how big this is but if you know anyone with a tig welder then they can tack it together at very low power. I've welded pop cans together before. What kind of metal?


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Old 04-11-2017, 9:48 PM
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Thanks but the metal is not the problem. It's the upper phasing coil. It's snapped in the middle and I think it just became a dual-band antenna. It'll take some judicious cutting and a lot of time tuning it...maybe.
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Old 05-04-2017, 1:57 PM
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Quote:
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Conductive glue?
Well, SpaceMann, I'm gonna try your idea. I have some silver conductive adhesive. After mending the phasing coil, I'm gonna put on a couple of thin coats of epoxy to help strengthen it.

I'll take my time to make sure the adhesive and epoxy cure properly. If it works, great. If not, well, I tried.
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