[TowerTalk] Johnson Matchbox coil

Bill MacLane ai4wm at yahoo.com
Sun Jul 27 16:36:29 EDT 2008

Super glue will most likely just oxidize on the plastic used to make these coils.  Duco Cement or hot melt glue are probably better.  I used GC service cement and Duco cement quite often on repairs with various plastic and find they work and super glue will not.  Superglue is great for attaching fake fingernails or placing a steel block onto your safety helmet and attaching it to a steel girder ( and I'd bet the block is a magnet).

Also Plexiglass, Lexan, G-10 stock and the acrylic that Lowe's sells for windows work fine for coil spacers.  I found a site some time ago where a fellow uses a sheet of lexan and drills 2 parallel rows of holes the size of the wire gauge for the coil spacing the holes on pitch for the TPI of the coil.  He then cuts the sheet and winds the coil through the holes.  There are several variations of this, but too much to explain in this forum.


--- On Sun, 7/27/08, Tom Osborne <w7why at verizon.net> wrote:

> From: Tom Osborne <w7why at verizon.net>
> Subject: [TowerTalk] Johnson Matchbox coil
> To: "Towertalk" <towertalk at contesting.com>
> Date: Sunday, July 27, 2008, 11:57 AM
> Hi TT'ians
> I have a 275 watt Matchbox antenna tuner that is in really
> nice shape, with 
> a blown bandswitch.  I purchased another 'junker'
> from a guy, and really, 
> the only thing wrong with it is the plastic on the coil has
> disintegrated 
> and it is kinda dirty.  It looks like it could be repaired
> by making some 
> plastic spacers of some sort.
> What would be the best way to reinforce the turns in the
> coil?  I was 
> wondering about super-glue.  Will it hold up in an RF
> environment?
> Other than the coil being sprung, it isn't in too bad
> of shape.  I'd kinda 
> like to repair it instead of taking the switch out and
> putting it in the 
> 'pretty' one.
> 73
> Tom W7WHY 
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