[Milsurplus] (no subject)

[J. Forster]

Robert,

Try something like a Newark catalog. They often list stranding:

#16 (7x#28) or #16 (19x#32)  <----THESE ARE FICTIONAL !!!

The common stranding are 7 and 19 because they pack nicely. I always
prefer the 19 strand as it's more flexible.

You did it the right way by calculating Circular Mils. I did not check
your math.

-John

================


> Joe,
>
> It's wise never to say never.  But I'm going to stick my neck out and say
> that unless you happened to stumble across something another ham or
> collector
> made up, you aren't going to find any ready made cables for the ARB.
>
> Meir was going to give you some information when he got home and checked
> the manual and I'm betting he either got tied up on something else or ran
> into
> the same thing I did.  The ARB manual does in fact have a drawing showing
> cable construction details.  But the wire to be used is given as number of
> strands of a given diameter, not in AWG.  I am (or was) a practicing EE
> and
> probably have as good a technical library as most.  And none of my
> reference
> books have stranded wire tables.  However, one of them gave some useful
> rules
> of thumb and another the specs on the strand specified in the ARB manual,
> and I have an answer for you.
>
> There is a two-conductor battery power cable and depending upon whether
> you
> are setting up a single-place or dual-place installation, one or two
> sixteen-conductor cables.  The sixteen-pin connectors may be straight or
> right-angle and have various insert rotations or key orientations.  But
> aside from
> that, all of the sixteen-conductor ones use the same conductors.
> According to
> the manual, The sixteen conductor cables are each made up of two
> conductors
> having twenty-six strands of 0.010" diameter wire and fourteen conductors
> having ten strands of 0.010" diameter wire.  The two-conductor cable has
> two
> conductors each having sixty-five strands of 0.010" diameter wire.
>
> Reference to the solid copper wire tables shows that #30 AWG has a nominal
> diameter of 0.01003".  So the strands are #30 AWG.  #30 has an area of
> 100.5
> circular mils.  So ten strands has an area of 1005 circular mils.  #20 AWG
> is listed as having an area of 1022 circular mils and one of the rules of
> thumb is that decreasing the AWG number by a factor of ten increases the
> area
> by a factor of ten.  Which is a cross check.  So the fourteen conductors
> are
> each #20 AWG stranded copper.  Twenty-six #30 AWG would have a nominal
> area
> of 2613 circular mils.  #16 AWG has a listed area of 2583 circular mils so
> the two large conductors are probably #16 AWG stranded (#15 AWG is 3257
> circular mils but that's quite a bit larger than 2613 and you can't
> commonly buy
> odd number wire above #1 so I think #16 must be correct, or at least
> satisfactory).  Sixty-five strands of 0.01." diameter will have an area of
> 6532.5
> circular mils.  #12 AWG is listed as having an area of 6530 circular mils.
> So the two battery power conductors are #12 AWG stranded.
>
> If you make up the remote control cable(s) from individual wires you need
> fourteen #20 and two #16.  Or alternatively, you could use twenty #20,
> which
> you might conceivable find in a multi-conductor cable.  And for the
> battery
> power cable, you can use $12-2 SJO, which you can get at any hardware.
>
> If anyone sees any error I made, please let me know.  But I believe the
> above to be correct.
>
> In a message dated 8/5/2009 3:54:25 AM Central Daylight Time,
> w5jdy at intergate.com writes:
>> Hello again from Joe w5jdy in Okla.   I would like to make a connecting
>> cable to go from a ARB military radio to the remote control head...  I
>> have
>> the connectors...  Anyone have any advice?   Mainly the size of the
>> wires
>> and how many of each size... Sure would like to buy one already
>> made-up...
>> Thanks Joe
>
> Robert & Susan Downs - Houston
> wa5cab dot com (Web Store)
> MVPA 9480
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