[Heathkit] Heathkit AT-1 Meter

[K5MYJ]

These POS IRON VANE meters are not repairable. What you are seeing is the 
typical failure of these meters.

The spring is the very thin section of metal between the outer end supports 
( there are no bearings) and the IRON VANE between the magnets. There is no 
current flowing through the part of the meter that moves.

The Heathkit AT-1, DX-20, and DX-35 all use this POS meter. The DX-40 has a 
real meter.

You could try finding a meter from a DX-35 or you could try a CalRad panel 
meter:
http://www.calrad.com/all-products/60-series

But trying to fix the original meter is a waste of time.

Bob Macklin
K5MYJ
Seattle, Wa.
"Real Radios Glow In The Dark"
----- Original Message ----- 
From: <hwhall at compuserve.com>
To: <mark.k3msb at gmail.com>
Cc: <heathkit at mailman.qth.net>
Sent: Wednesday, June 29, 2016 10:36 AM
Subject: Re: [Heathkit] Heathkit AT-1 Meter


>
> Is it just my eyes, or is there no spring at all in that construction? If 
> not, then what did it rely upon to return the needle to zero when no 
> current flows?
>
> The mp4 clip doesn't seem to be running right here.
>
>
> Wayne
> WB4OGM
>
>
>
> -----Original Message-----
> From: Mark K3MSB <mark.k3msb at gmail.com>
> To: Wayne Hall <hwhall at compuserve.com>
> Cc: Ronald Youvan <ka4inm at gmail.com>; Heathkit List 
> <heathkit at mailman.qth.net>
> Sent: Wed, Jun 29, 2016 5:38 am
> Subject: Re: [Heathkit] Heathkit AT-1 Meter
>
>
>
>
> Well,  I further disassembled the meter.   Here's some pix and a short 
> clip to wow and amaze you......
>
> www.k3msb.com/at1/front.jpg
> www.k3msb.com/at1/bottom.jpg
> www.k3msb.com/at1/top.jpg
> www.k3msb.com/at1/side1.jpg
> www.k3msb.com/at1/side2.jpg
>
> www.k3msb.com/at1/clip1.mp4
>
>
> I see no way to perform any adjustment.  loosening the small screw at the 
> bottom of the meter does nothing.
>
>
> I assume that the two small discs are magnets   I was thinking of holding 
> one and attempting to rotate the other (or perhaps rotate the pointer). 
> Unless there is something that was magnetized during my tests, the only 
> other thing that could have happened to the meter was a force which moved 
> some of the parts, and an opposite force may help.    Of course, it could 
> bust things too.....
>
>
> 73 Mark K3MSB
>
>
>
>
>
>
>
>
>
> On Tue, Jun 28, 2016 at 11:09 PM, Mark K3MSB <mark.k3msb at gmail.com> wrote:
>
> The meter glass,  face, etc was already removed before my last post.
> The meter has a metal case with glass front.
> Mark
>
> On Jun 28, 2016 11:06 PM,  <hwhall at compuserve.com> wrote:
>
> One more thing to try... Apply some moisture to the meter face. "Fogging" 
> it with your breath might be sufficient. Occasionally, some meters can 
> acquire a static charge on the meter face or body that pulls the needle 
> out of place. Plastic body meters seem most likely to do that. Some folks 
> recommend wiping on some thinned soapy water to prevent recurrence.
>
>
> Wayne
> WB4OGM
>
>
>
> -----Original Message-----
> From: Mark K3MSB <mark.k3msb at gmail.com>
> To: Ronald Youvan <ka4inm at gmail.com>
> Cc: Heathkit List <heathkit at mailman.qth.net>
> Sent: Tue, Jun 28, 2016 8:49 pm
> Subject: Re: [Heathkit] Heathkit AT-1 Meter
>
> Ron & Wayne
>
> The needle moves a bit when I jiggle the meter.  When I blow on the needle
> it move freely in the appropriate direction.
>
> Using a battery and series resistor the meter fully deflects from "noon" 
> to
> the right.  Reversing polarity the meter fully deflects from "noon" to the
> left.  The meter returns to "noon" quickly.
>
> There is no adjustment of any kind that I can see.
>
> I think the meter is original, it matches the pictures in the manual.
>
> Orientation - I'll verify tomorrow but I'm pretty sure the "noon" resting
> point doesn't change.
>
> 73 Mark K3MSB
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