[Milsurplus] Question regarding swapping the broken multi element switch of an ART-13

[Meir WF2U]

Hi Dennis,

L113, L114 and the S113 switch sections are all on one L-shaped subassembly
which is mounted on the firewall (as the manual calls it) of the 813/2x811
compartment. I'm not worried about the disassembly from that side, but I'm
trying to avoid having to get into the autotune section and pull the
autotune unit of that control in order to be able to withdraw the shaft of
the switch assembly. If I unscrew the setscrews of the coupling which
connects the switch shaft to the autotune, it doesn't look like I may have
the room to uncouple the shafts without having to pull out the autotune
module for that section. Just what you think I may probably have to do :-(
... 

I'll practice the removal of the assembly on the ART-13 carcass - that's the
assembly I want to extract to use as the replacement for the one with the
broken S113 shaft.  I don't intend just to replace the switch, but the whole
assembly.

Thanks for the input!

73, Meir WF2U
Landrum, SC

-----Original Message-----
From: mac [mailto:w7qho at aol.com] 
Sent: Saturday, February 02, 2013 12:17 AM
To: Meir WF2U
Cc: Milsurplus
Subject: Re: [Milsurplus] Question regarding swapping the broken multi
element switch of an ART-13

Myer,

As you probably know , S-113D is there to prevent the transmitter from  
being keyed if/when Control C is between one of it's numbered  
positions.  Buried way at the back of the assembly holding many of the  
PA tuning components including L113, L114, S-113 switch sections A  
thru H and a bunch of fixed capacitors.  Never done it but looks like  
the assembly should drop out through the bottom of the radio if the  
mounting screws can be reached and some connecting wiring can be  
unsoldered.  One would probably have to dismount the "C" autotune   
unit and pull it forward to release the S-113 switch shaft as well.   
Looks like there's a set-screw to be released on the shaft coupling too.

Always tight working inside an ATC/ART-13 but looks doable here.

Good luck.

Dennis D.  W7QHO
Glendale, CA

****************
On Feb 1, 2013, at 7:24 PM, Meir WF2U wrote:

> Folks,
>
>
>
> As I was evaluating several ART-13(*)'s I managed to collect  
> throughout the
> years, I was working on an early T-47/ART-13 (also has a British Air
> Ministry tag on it) attempting to try to get it on the air. It  
> passed the
> smoke test, but the VFO and sidetone didn't work. I went through the
> troubleshooting procedure according to the TO 12R-2-2ART13-2 manual. I
> checked switch S113D of the multi element switch (the one under the  
> big L113
> coil) for closure on any numbered position of control "C". I  
> discovered that
> the shaft of the cam arrangement which activates the switch is  
> broken and
> the switch stays open when it should be closed.
>
> I have an ART-13 carcass with only a few parts on it, one of them  
> happens to
> be the assembly I need to replace (see figures 8-13, 8-14, 8-15 and  
> 8-16 in
> the manual above).
>
> My question is: does anyone know whether the assembly can be removed  
> and
> swapped without having to take the whole transmitter apart, and  
> whether
> anyone has any experience replacing the multi element switch assembly.
>
> The ART-13 in question otherwise is in very nice shape cosmetically,  
> and I'd
> love to be able to make it work, instead just having it as a parts  
> mine.
>
>
>
> Any advice/suggestions and pointers are welcome.
>
>
>
> 73, Meir WF2U
>
> Landrum, SC
>
>
>
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>
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