Now we all have been taught about relay racks (19 inches). Telephone
companies use 23 inch racks. In the EMC field we use a _41_ inch rod
antenna to measure low-frequency electric fields. Why 41 inches?
As related to me, when testing was done on the C47, that was the longest
rod antenna that would fit at the radio operators position. And now it's
standard.
BUT! Per
http://www.jedai.com/solutions/Plant_Business_Ready.pdf a telecom
rack has TWO sizes: "the smaller NEBS rack is 20 5/16. "
Great sliding standards, Batman! Where will it end? Woe! Woe!
Ahem.
The decibel is mighty nice;
You can measure once, and then cut twice.
The reason we can be so free?
To one dB, pi equals... three!
Cortland
KA5S
> [Original Message]
> Tom, KJ3D wrote
>
> particularily gruff vice admiral who I'm pretty sure coined the phrase
> "lead, follow or get the hell out of the way", and liked to continually
stir
> whatever pot he happened to be in charge of at the time.
>
> For whatever reason, he called me into his office, one day, and asked me
if
> the 19 inch rack panel was a standard or a tradition. I had long since
> learned not to ask him why he was curious, I just charged off to find out.
>
> I uncovered countless references to 19" racks, and a lot of things which
> specified it, but failed to find out anything about its genisus. Since
> failure was not an option, I reported that it had something to do with the
> width of hatches on early submarines, but an original order - if one
existed
> - was lost in the fog of the past. In any event, the 19 inch "standard"
> was so deeply ingrained in the military (and a good bit of civilian
industry
> as well) that it might as well have come down as the 11th commandment.
>
> He grudently accepted my "findings", but continued to press the issue,
> claiming that if services were going to continue to support 19" racks,
there
> needed to be a mil spec actually in place. Thankfully I retired before
> being thrown into that briar patch.
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