At 07:10 AM 7/2/2006, Charles Gallo wrote:
>On 7/2/2006 Mirko S57AD wrote:
>
><snip> In my 40 years of ham radio,
> > I actually have seen lot of wire antennas broken right next to soldered
> > point.
>
>
>The main reason wire breaks right next to a solder joint is that there
>is MUCH less flex in the soldered section - this means that the wire
>will flex MUCH more right outside the soldered zone - the copper work
>hardens and breaks. I spent a lot of years doing environmental and
>'dynamics' testing and analysis - aka "shaking and baking" electronics
>- used to see that problem, which is why the military has very
>specific standards for what can be soldered, how (like the solder is
>supposed to wick up under the teflon, and how the wires are secured to
>make sure there is no flex at the solder joints
The same reason (and the fact that solder is quite brittle and work
hardens) is why crimped on connectors
are preferred to soldered on. The only complaint that I've heard (for high
rel work) about crimped connectors is that it's harder to inspect.
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