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Old 07-30-2005, 04:22 PM
Jeff Liebermann
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Default Re: Cantenna Polarity Question

On Sat, 30 Jul 2005 10:41:25 GMT, David Taylor <djtaylor@bigfoot.com>
wrote:

>> > Clue: The sex of the connector is NOT determined by the center pin.

>>
>> sez you! All I pointed out is that there are differing labels on the parts
>> on different vendor web sites.
>>
>> > How about a reverse *THREAD* SMA connector?


>Hey I have a great idea, how about they use left hand threaded
>connectors too, and what about some imperimetric pitch for a change too.


It's a lesson that has to be learned over and over again in each
industry. To prevent accidentally misconnecting air hoses and
hydraulic hoses in vehicles, aircraft, and welding rigs, the threads
are different. The logic is good and it has undoubtably prevented
many accidents. However, it has not stopped a clever mechanic, who's
solution to a "bad fit" problem is to get a bigger wrench. I've lost
count of how many times I've tried to brute force a "mini-UHF"
connector into an "F-connector". They look very similar but have
different center pin diameters and threads.

Given the availabliliy of different SMA connector mutations, I would
certainly have used them to prevent accidentally reversing the input
and output in one of my ancient power amplifier designs. Personally,
I would prefer "keyed" connectors, but they tend to be expensive to
build, especially in small sizes.


--
Jeff Liebermann jeffl@comix.santa-cruz.ca.us
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
AE6KS 831-336-2558

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