[MRCA] Anyone ever built a CD-501-A Power cable for an SCR-284/BC-654??

[Dennis DuVall]

Garret,

OK understand you have the original connectors, one male and the other female, 8 pins each, pins clearly numbered on the insulating inserts.  Just wire Pin 1 to Pin 1, 2 to 2, etc. through 8 to 8. Remember to include an extra wire (or use the shields of one or more of the other wires if you go that route) to electrically tie the shells of the two connectors together.   The original connectors are painted OD.  Civilian equivalents made by Amphenol work OK too but don’t look as nice.  As I mentioned in my earlier message there are no RF or audio lines in this cable that require shielding.  Also the cable is quite short electrically speaking so #20 or #22 wire is more than heavy enough to run the radio but you could go to #18 for pins 1 & 2 which carry 6 and 12 vdc.

The reason you are having trouble finding the specific information you have been looking for in the TMs is because GI's were not expected (or authorized) to make up cables in the field.  We hams do this all the time of course… :^)

Dennis D.  W7QHO
Glendale, CA

****************





> On May 30, 2016, at 1:26 PM, Garret Scott <scottgs at bellsouth.net> wrote:
> 
> I’m constructing some cables, and having difficulty finding a diagram which shows which conductors are supposed to be the larger wire gauge sized.   
>  
> I’ve ready through three TM’s, and still can’t really figure out how it is supposed to be wired.  
>  
> I have my ideas, but hoping someone here may have actually done it before. 
>  
> Thanks,
> Garret
>  
>  
> From: Garret Scott [mailto:scottgs at bellsouth.net <mailto:scottgs at bellsouth.net>] 
> Sent: Sunday, May 29, 2016 12:04 AM
> To: 'MRCA at mailman.qth.net <mailto:MRCA at mailman.qth.net>'
> Subject: BC-654 SCR-284 Power Cable and LS-7 Speaker Needed
>  
> I’m searching for the power cable for a BC-654 (SCR-284). This is the cable that goes between the dynamotor and the radio. 
>  
> I have the connectors, but need the cable itself.   It’s a 6 conductor 20AWG + 2 conductor 14AWG SHIELDED cable.  Anyone have a source?   All I need is 6 feet.  
> Original cable nomenclature is: CO-08LFG(6/20-2/14)SJ0475.
>  
> I would rather find a complete original cable with connectors, if anyone has one.   
>  
> I’m preparing this radio for a live display of WWII equipment, which will be operating as Special Event Station N4M on June 10-12, and also as NPOTA HP50 activation (Manhattan Project National Historical Park). This is part of a festival commemorating the Manhattan Project and the formerly Secret City of Oak Ridge, Tennessee. 
>  
> http://www.orarc.net/secretcityfestival/index.html <http://www.orarc.net/secretcityfestival/index.html>
> (Please wait about 5 seconds for it to redirect)
>  
>  
> Also looking for:
>  
> LS-7 Speakers.  Even just the guts, as I have several NOS housings and cables. 
> GN-45 hand crank generator
> Dogbone for GRC-19
>  
> Any help would be greatly appreciated. 
>  
> Garret Scott
> W8BUG
> 865.310.5179
> scottgs at bellsouth.net <mailto:scottgs at bellsouth.net>
>  
>  
>  
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