[Elecraft] KX2 Battery Question

[Mark Petiford]

RE: Kapton tape


Matt,

Kapton is actually a pretty good insulator, but it is NOT a good material to prevent abrasion.  The aircraft industry tried to use it as wire insulation, and as an anti-abrasion wrap around entire wire bundles.  Unfortunately, some manufacturers jumped the gun and implemented it without testing, using "qualification by analysis" as their basis for using it.  I must admit that it SEEMS like it would do those jobs well.  


It turns out that when we tested it, we found that it doesn't do well in a high humidity and high vibration environments, and doesn't withstand chaffing very well either.  We rejected its use, but not before we had wire harnesses already in production using Kapton insulated wires.  Needless to say, we had to rework those harnesses.  I don't know if the FAA issued an Airworthiness Directive against those aircraft that were delivered using Kapton insulation, but there was discussion of that

Mark,
KE6BB


      From: Matt Zilmer <mzilmer at roadrunner.com>
 To: elecraft at mailman.qth.net 
 Sent: Saturday, May 27, 2017 2:22 PM
 Subject: Re: [Elecraft] KX2 Battery Question
   
Someone mentioned Kapton tape earlier, to be used to insulate the
battery side of the PCBA.  Kapton tape is conductive and used mostly for
EMI shielding.  Putting it or other tapes (some electrical tapes) on the
the PCBA would probably change electrical characteristics - conduction
between unmasked vias/pads, etc.

I would avoid using Kapton if you want an insulator.

Just thought this might benefit someone later on.

73,

matt W6NIA


On 05/27/2017 10:42 AM, Wayne Burdick wrote:
> There are no components anywhere near the battery. The bottom of the RF board in this area was left completely clear specifically to avoid the need for any supplemental insulating material.
>
> 73,
> Wayne
> N6KR
>
>
>
>> On May 27, 2017, at 10:14 AM, Peter Pauly <ppauly at gmail.com> wrote:
>>
>> I would have liked to see a big piece of kapton tape covering the board. Aren't the components ESD sensitive?
>>
>> On Sat, May 27, 2017 at 10:23 AM, Tim McDonough N9PUZ <tim.n9puz at gmail.com> wrote:
>> On 5/27/2017 12:14 AM, Wayne Burdick wrote:
>> I have a "new to me" KX2 along with the internal battery and charger. Inside the KX2 battery compartment, is there supposed to be any sort of insulating sheet or pad covering the circuit board?
>>
>> No insulating sheet is necessary. The battery is double shrink-wrapped, there are no parts on that area of the PC board, and there’s nothing sharp that could abrade the plastic covering. It’s all quite safe.
>>
>> There is of course a rubberized pad on the inside of the bottom cover. This creates high friction to keep the battery from moving around.
>>
>>
>> Very good. Great radio and I just didn't want to mess anything up.
>>
>> Thank you Wayne!
>>
>> 73,
>>
>> Tim N9PUZ
>>
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-- 
"Always store beer in a dark place." -- R. Heinlein

Matt Zilmer, W6NIA
[Voignier]

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