This has me bemused; when I was new in the trade, I worked for Wang Labs
in Tewksbury, Massachusetts. In fact, I got into the trade there (during
the interview i asked to be allowed to play with the receiver -- fun!)...
Our chamber was not tall enough to raise antennas to 4 meters; the
building was too low; we could only reach 3 meters. So Glen Dash, he of
Dash, Strauss and Goodhue, was called in to figure out a work-around.
I'm told he said we could not use the chamber!
True enough for certification, but we did audits in that chamber, not
certification, so I suggested he pick one of our test items as typical,
test it in Boxborough at his own site, and then retest it in Tewskbury
so we could do exactly as suggested here and apply correction factors.
That was done. Basic Physics.
We found manufacturing defects. Long leaded transistors oscillating,
cabinets modified by a factory to be easier to assemble .... It must
have worked. Which leads to another thing: Most of the really
egregious errors aren't 1 or 2 dB; they're 10 or 20. How close does a
pretest have to BE?
*First define the requirements.* That's basic, too.
Cortland RIchmond
(KA5S)
On 12/22/2011 12:08 AM, Bill Owsley wrote:
At a basic level, do an NSA for the chamber and compare to the OATS
NSA to develop a correction factor for the two.
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