[TMC] Directional Coupler Advice/Parts needed

[John Poulton]

This is going to be an interesting, maybe impossible, repair, I'm afraid.
You can see what's involved in the photo at:

http://tmchistory.org/tmc_tables/rig_pix_db/swr/swr-1k_top.jpg

As you may know, the TMC part number (DC-301 in this case) refers to a
drawing number.  For whatever reason, we don'd have the drawings for this
particular Directional Coupler--the drawings stop at DC-107.  Heaven only
knows what happened to the higher-numbered drawings.

There's a Specification document (S-1134) that describes how to convert a
CU-1 to a CU-2, but I'm afraid it's of limited value, since you can't order
the necessary parts from TMC any longer.. :)

If the UK fellow could send a photo of the present condition of his CU-2,
that might be useful..

Best of luck  with this, and if there's anything I can do to help out, let
me know.

73, John K4OZY




On Wed, Jan 27, 2016 at 7:32 PM, Roy Morgan <k1lky68 at gmail.com> wrote:

> TMC folks,
>
> I got this request for help from a UK fellow on the Glowbugs list, and
> offered to forward his request to the TMC list:
>
> It appears that he has an SWR-1K SWR indicator system, and the directional
> coupler has suffered a disaster (the cat knocked it off his bench and it
> broke!).  He’d like to find a replacement, or short of that may attempt a
> reconstruction of the coupler module.
>
>
> From the manual on John Poulton’s collection:
>
> http://www.virhistory.com/tmc/tmc_pages/tmc_manuals/manuals_db/swr/tm_swr-1k_2_17_73.pdf
>
> It seems that the module is the DC-301 directional coupler known as the
> CU-2.  None of the parts in the thing seem to be unusual, but altogether it
> would be a daunting thing to reconstruct.  It’s not quite clear whether
> what’s broken is the whole DC-301/CU-2 assembly or just what might be the
> critical R301, a 0.6 ohm 40 watt resistor.
>
> The manual states:  "CU-2 Coupler Assembly is replaced as a unit.  It
> requires precise alignment at the factory before use … "
>
> Any advice or help in finding a replacement would be most appreciated.
>
>
> Begin forwarded message:
>
> > From: CLIVE COLLINS <dartaviation at btopenworld.com>
> > Subject: [Glowbugs] Technical Materiel Company products information
> > Date: January 15, 2016 at 11:34:43 AM EST
> > To: Glowbugs <tetrode at googlegroups.com>
> > Reply-To: CLIVE COLLINS <dartaviation at btopenworld.com>
> > Delivered-To: k1lky68 at gmail.com
>
> > Good day gentlemen,
> > Is there anyone out there who is a specialist in TMC equipment please. I
> need some information on their VSWR indicator that was fitted to the one
> kilowatt  linear please. The dtector eement in mine has suffered from a
> mechanical shock and I suspect that the  key element will need to be
> replaced as it appears to be formed from glass
> > Thanks in advance,
> > Regards
> > Clive GW3WEQ North Wales Coast UK
>
> Later he sent me this:
>
> On Jan 27, 2016, at 11:01 AM, CLIVE COLLINS <dartaviation at btopenworld.com>
> wrote:
>
> > Good day Roy,
> > I would be most grateful for any help on this problem like through the
> TMC network.
> ...
> > With regard to the VSWR device.
> > The tube in question is made of glass and is inserted inside the
> detector assembly to contain certain (as yet) unknown components that are
> part of the VSWR detector arrangement. I am fairly sure I can fabricate
> such a tube in copper as the glass one has a copper sputtering coating on
> the outside that as far as I can see is only a grounding arrangement
> but......?
> >
> > This unit is the heart of the one kilowatt VSWR indicator that produces
> an output to the crossed needles display meters showing forward and
> backward VSWR and is so helpful in setting out put from a transmitter to
> optimum.
> > I look forward to you comments.
> > Kindest regards
> >
> > Clive GW3WEQ North Wales Coast UK
>
>
>
>
> Roy
>
> Roy Morgan
> k1lky68 at gmail.com
> K1LKY Since 1958
>
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