Leon wrote:
> Jerry Avins wrote:
>
>>
[email protected] wrote:
>>
>>>What type of hardware is typically used for frequency modulation?
>>
>>Can you me more specific about the application? Commercial broadcast
>>practice is very different from unlicensed baby monitors.
>>
>>Once, when I was stuck in the shack at W2HJ (never mind why) and the
>>plate modulator was on the bench for rework, I tack soldered the edges
>>of a tin can
>
> ^^^^^^^^
>
> Was that a Jerry can? 8-)
If anybody can, Jerry can!
The name "Jerry can" is a G.I. tribute to German engineering. Our (and
British) five-gallon metal containers for gasoline and other liquids
were thin ternplate, the same stuff used for gallons of maple syrup or
olive oil. They were hard to carry and easily punctured. Captured German
cans were sought after early in the North African campaign. They were
the model for improved cans that were soon supplied. Our redesigned cans
after the German model were even better: the screw closure used the same
threads and accepted the same fittings as standard 55-gallon drums, and
they have three handles instead of one. The inner handle is centered for
use by a single person, while the outer two make it easy for two people
to carry a single can -- they're heavy when full -- and the three
together create a level surface that makes the cans easy to stack one
above the other. The screw cap can be removed with a stick (in a pinch,
a bayonet) or hammer (or rock) blows, and covers a vent hole that is
exposed when a flexible pour spout is used in its place. It's an example
of great design, still in use after 60 years.
Jerry
--
Engineering is the art of making what you want from things you can get.
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