...it's not becoming brittle due to heat! It becoming oxidized by air under
the influence of heat: the hotter the faster.
As for not soldering : in high power systems, especially in CCS, operating
temperatures are close to the melting point of solder so they CAN melt down.
BTW, this very same problem is encountered in high power electrical
installations, where screw on connections are the rule.
It's not a radioman's problem only.
About not soldering on 70 ohms coax: who said you can't? it's true that it's
a little more tricky, due to different dielectric materials (softer and with
a lower melting point) but you can definitely do it, if you have a sure hand
and can do it quickly, so as not to melt the dielectric.
Alex 4Z5KS
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of Charles Harpole
Sent: Wednesday, May 02, 2012 8:40 PM
To: amps@contesting.com
Subject: [Amps] brittle shields? and soldering vs crimping
Has anyone on Planet Earth ever heard of copper or tined copper "becoming
brittle" due to heat?
And what about the report of not soldering the center conductor because of
the use of high power and 70 ohm coax?
Was I naping when some passed the ham test? 73,
Charles Harpole
k4vud@hotmail.com
----------------------------------------
> Date: Wed, 2 May 2012 10:12:37 -0700
> From: k2vco.vic@gmail.com
> To: amps@contesting.com
> Subject: Re: [Amps] soldering vs crimping
>
> It's not tricky if you have three things:
>
> 1) The right soldering iron. I have a Weller W100P that I use for
> this. It's also handy for copper tubing and strap in tank circuits,
> etc. It has a large thermal mass so that the heat is transferred to the
connector quickly, and is also temperature controlled.
>
> 2) Decent connectors. You need these anyway! I have some that I
> inherited that solder doesn't stick to.
>
> 3) Decent coax, with good braid coverage. Again, you need this anyway.
>
> On 5/2/2012 9:51 AM, Dick Green WC1M wrote:
> > I'm with Carl on this one. Actually, the crimp N-connectors I use
> > have center pins designed to be crimped *and* soldered -- there's a
> > little hole in the side for soldering. I've found that there's so
> > much variation in center conductor size that crimping *and*
> > soldering makes for the most secure connection. The UHF crimp
> > connectors I use all require soldering for the center conductor --
> > you can't crimp it. As for the shield, there's no question in my
> > mind that crimping is superior to soldering. It's very difficult to
> > properly solder shield braid without overheating it and melting the
dielectric. I'm not saying it can't be done -- only that it's tricky.
> > I've only had a few solder connector failures over the years, but
> > they've all involved either deformation of the dielectric due to
> > overheating, or breaking of the shield because it became brittle after
soldering.
> >
> > 73, Dick WC1M
>
>
> --
> Vic, K2VCO
> Fresno CA
> http://www.qsl.net/k2vco/
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