Perry - K4PWO wrote:
> JB Weld is RF "safe" (as they state on their Web site) and I have tested it
> (the old glass of water with a sample of JB Weld in the microwave test) and
> used it in RF environments.
>
Glad to hear that. From all the descriptions I was seeing a conductive
material. It really is strong and if a good insulator at the desired
frequency it'd be easier to work with that resin and mill fiber for the
inexperienced. I wonder how it holds up to UV as epoxy/fiberglass do
not do well with UV without a good protetorant.
73
Roger (K8RI)
> 73 de Perry - K4PWO
>
>
> ----- Original Message -----
> From: "Gary "Joe" Mayfield" <gary_mayfield@hotmail.com>
> To: <towertalk@contesting.com>
> Sent: Saturday, April 11, 2009 22:18 PM
> Subject: Re: [TowerTalk] JB Weld
>
>
> Has anyone put some in the microwave to see if it heats up?
>
> 73,
> Joe kk0sd
>
> -----Original Message-----
> From: towertalk-bounces@contesting.com
> [mailto:towertalk-bounces@contesting.com] On Behalf Of Mike
> Sent: Saturday, April 11, 2009 8:45 PM
> To: towertalk@contesting.com
> Subject: Re: [TowerTalk] JB Weld
>
> Yes, JB Weld is truly wonderful. A while back I managed to break the
> aluminum cooling fan off the motor for my swimming pool pump while changing
> the bearings. All that was left on the armature shaft was about one inch
> diameter of circular ragged aluminum. With nothing to lose at this stage but
> 250 bucks, I used JB-weld to attach the rest of the fan to the remaining
> piece that is attached to the shaft. It has been running at 3,800 rpm for
> years. I would say that it attaches aluminum better than tenaciously:-)
>
> JB-Weld is magic,
>
> Mike
>
> -----Original Message-----
> From: towertalk-bounces@contesting.com
> [mailto:towertalk-bounces@contesting.com] On Behalf Of Dennis W0JX
>
> JB Weld is a wonderful adhesive. It has better tensile strength than most
> epoxies (listed as 3960 psi on the package). It will adhere to plastics in
> situations where most other epoxies will not. It will adhere to aluminum
> tenaciously if the surface is cleaned and roughed up a bit.
>
> However I question its insulation qualities at RF. While the packaging says
> that it "does not conduct electricity" the packaging also states "The unique
> J-B Weld formula of liquid steel and compound hardener..."
>
> Therefore, I would avoid using it where a radiating or parasitic element
> touches the compound itself. However, you could put some kind of appropriate
> insulating barrier between the J-B Weld compound and the radiating/parasitic
> element.
>
> Dennis W0JX/8
>
>
>
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