CD - Cords

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Extension cords complete with terminals. / plugs.

  • (it should be noted that cord combinations, depend in large part on type of installation, for instance the 20+ cords listed for the SCR-245 were not all used at once.)

cord thought's

On cord lengths and Signal Corps Nomenclature and Stock Numbers, most cord nomenclature and stock numbers of cords specify a single length. So there are different nomenclatures and different stock numbers for different length cords, even though the different cords are the same except for length. The various power and control cords used in different models of the SCR-193 are like this. With the equipment dismounted, any cords can be made to work. But when installed in the vehicle, some will be too short and others too long.

Now, to the CD-307 and CD-307-A. The original difference between the two was that the -A used "close spiral" cordage CO-119. When CD-307-A began to replace CD-307, they originally had stock number 3E1307A- and the length. By the end of the War, someone had decided to change the definition of the shorter stock numbers (without the "A") to require CO-119 and all of the longer numbers in SIG 5 were changed to read Superceded" and some text saying to use the shorter number.

Anyway, the CD-307 and CD-307-A (and a very few others widely used in many different lengths) is an exception to the rule of having the nomenclature define the length. All lengths have the same nomenclature (CD-307 or CD-307-A) (this practice was later apparently applied to all cables). But the Stock Numbers ID the actual length. The base stock number is 3E1307, followed by a hyphen and the length. As written, it looks like a decimal number. But it is actually feet and inches, not decimal feet. If they had made one 35" long (2 feet and 11 inches), the stock number suffix would have been -2.11. So 3E1307-5.5 (probably the most common size) is 65" long, not 66". That would be suffix -6.6. Then to add further confusion, cords usually have (through the end of WW-II) a metal band or sometimes two of them wrapped around the cordage. On this band is stamped the nomenclature and the length in inches, not feet and inches. WA5CAB.


(NOTE 1920 storage catalog ends here)