[ARC5] Transmitter Woes

[David Stinson]

Take a look at this photo, shamelessly stolen from the web ;-):
http://home.netcom.com/~arc5/ARC5/bc-696.jpg
The red arrows point to wires that go through holes
in the sides of the caps.  Those wires are connected
to metal strips that are press-fit to the end of the cap stators.
The posts that are pressed against the metal strip
to attach it to the stator is where the oxides build-up
and create a Hi-Z joint.
It ain't easy to get at, but it's becoming a common problem.
The rear cap has it too, just couldn't see the wire in the photo.
You'll get the idea.
73 Dave S.

----- Original Message ----- 
From: "Mark K3MSB" <mark.k3msb at gmail.com>
Subject: Re: [ARC5] Transmitter Woes


> Dave, I'm staring at the air variables and don't see what you're referring
> to.
>
> With the TX upside down and front towards me,  I see the glass spacers on
> the right side of the stators but there are no wires connected to them.
>
> What am I not seeing ?
>
> Mark K3MSB
>
>
> On Sat, Oct 5, 2013 at 7:16 PM, David Stinson <arc5 at ix.netcom.com> wrote:
>
>> Just another reminder to check the transmitter variable
>> capacitor stators-  there is a little metal strip press-fit on the end
>> of the stators to which the wires are soldered.  Many of these are
>> beginning to get Hi-Z between the strip and the stator.
>> Oxidation builds-up between the strip and the stator posts.
>> A hot soldering iron (with care not to melt the little plastic
>> mounting balls) on one of the posts to the strip will fix it.
>> I've also begun to find this in the receiver variable caps,
>> including one that had a Hi-Z junction between two of the plate spacing
>> washers that mount the rotor plates.
>> I fixed that with a jake-leg spot-welder.
>> These vets are showing their age.
>>
>> 73 DE Dave AB5S
>>
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>