Coffee.
In the early 1980's I was working on a new PA design for Phoenix Missile. The
original design used relatively narrow band klystons, and we needed more BW for,
well, never mind. So the new design used a three-stage IMPATT diode amplifier
(injection-locked oscillator in reality). A single diode driving a three-diode
combiner driving a 16-diode combiner. The IMPATTs needed to be pretty well
matched, a real problem with the state of the art at the time.
So before we characterized each one in a test fixture, we serialized them. Mind
you these were microwave packages with a ceramic pill mounted on a 1/8" diameter
gold-plated copper flange with a 3-48 stud on the bottom. We just used a very
fine probe to scratch the 10 digit serial number on the flange. I could do
about 30 diodes first thing in the morning. After that and a cup or two of
coffee I was done for the day.
Wes N7WS
On 8/31/2017 11:21 AM, Fred Jensen wrote:
There is one infirmity that has not yet been mentioned that degrades one's
ability to work with SMT devices ... allergies. One sneeze and your project
is over.
73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County
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