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Hints, Tips and Solutions (Do NOT post requests for help here) If you have any useful general hints and tips for vintage technology repair and restoration, please share them here. PLEASE DO NOT POST REQUESTS FOR HELP HERE!

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Old 13th Jul 2007, 7:31 am   #1
Mike Phelan
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Smile A tale of two aerials

I thought it might be interesting to let you see how I repaired two broken Hacker aerials that I fixed for Howard.
As found, aerial #1 had come out of its tube completely and broken, the knuckle was not visible, but all the sections were intact.

On #2, the rod just pulled out, as did the innermost tube, which looked to have about 15mm broken off the bottom end.

The aerial is constructed with two bronze half-shells that are attached to the bottom end of each tube. These form a bearing, and prevent the tube from coming out of the top of the next outer tube, whose end is closed in at the top.
The bottom of the tubes have two holes, where a “dimple” on each half-shell locates it, and forms a stop for the next inner tube.

#1 first:
I pushed a rod through the tapped hole at the bottom, so the knuckle could be brought out of hiding into position at the top. The broken outer tube had about 10mm attached to the swage on the knuckle, so I cut the remains off. The aerial can all be dismantled by unscrewing the top and pushing each tube out, starting with the rod. Note that each pair of half-shells is unique!
The outer tube needed the bottom end squaring up on the lathe.
After reassembly, I used Loctite 601 bearing fit to attach the outer tube to the knuckle (first time I have tried this). After leaving it for 2 hours, it seemed to be fine with a bit of pulling and pushing.

#2 (picture below)
I had to cut the outer tube to dismantle it – a piercing saw with the lathe in slow backgear is my preferred method, and leave a perfectly square end.
The inner tube remains were still there, but the half-shells from the rod must have fallen out sometime. Dismantled it all first.
I squared up the end of the intact part of the tube and drilled the two holes for the half-shells.
This meant that the end of the rod was much too far down, so I drilled another cross hole in it, but left the excess length of the rod there for stability.
I needed something to replicate the half-shells now. From a piece of the broken tube, I cut it off to about 8mm and slit it so it could be closed up on the rod. It would not go into the tube, so needed filing, gripped in a pin vice. Once this was in, a brass clock pin was driven in to retain it, and the end cut off so the rod would go up into the tube.

One point here, when these have been repaired: as the outer tube is always going to be about 8mm shorter, it will push below the casing when you close it up. This could be avoided if the screw that retains the solder tag is made a bit longer; this does mean that the next inner tube will always project a little, though.

A bit of advice – don’t throw any scrap aerials (car or domestic) or any of these telescopic magnet thingies – tubes are useful for aerial repairs!
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Old 13th Jul 2007, 11:07 am   #2
Brian R Pateman
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Default Re: A tale of two aerials

Excellent work as usual Mike.

A candiate for "Stickyness" if ever I saw one!


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Old 13th Jul 2007, 1:50 pm   #3
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Default Re: A tale of two aerials

Well done Mike, a very good and informative explanation as usual .

It's always worth 'having a go' when there's nothing to lose... but I did sweat a bit when I, recently, had to cut up a perfectly good aerial for my Beolit 609FM!

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Old 13th Jul 2007, 2:07 pm   #4
Robert Darwent
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Default Re: A tale of two aerials

Hi Mike

Thanks for sharing how you went about fixing Howard's broken aerials. You make a very fiddly repair look easy!

I've tried to repair several aerials without much success. I always have trouble in keeping the half-shells in place. They always pull out from one section or another when the aerial is extended. Obviously I'm nowhere near as skilfull as yourself

Well done!

Robert G0UHF
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Old 13th Jul 2007, 7:01 pm   #5
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Default Re: A tale of two aerials

Hello Mike,

And many thanks for fixing my two Hacker telescopic aerials.

You really are a clever chap !

Regards ....... Howard
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Old 13th Jul 2007, 7:25 pm   #6
Paul Stenning
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Default Re: A tale of two aerials

Originally Posted by Brian R Pateman View Post
Excellent work as usual Mike.

A candiate for "Stickyness" if ever I saw one!

It's sticky.

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Old 15th Aug 2015, 10:56 pm   #7
Join Date: Oct 2014
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Default Re: A tale of two aerials

Looking for info on a TV aerial, I came across this
and wondered if it might be another solution ?
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Old 16th Aug 2015, 12:43 am   #8
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Default Re: A tale of two aerials

I repaired A DAB radio with a telescopic back scratcher.
The aerial had been snapped off and was missing.
The set did not have a knuckle on the original so this part was ideal but slightly short for FM.
It was almost a drop in replacement.
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