On Dec 7, 6:52*pm, JIMMIE wrote:
On Dec 7, 4:23*pm, Tim Wescott wrote:



On Sun, 07 Dec 2008 12:48:14 -0800, SparkyGuy wrote:
Halfway down this page (it's a PDF doc):

http://www.cablesandconnectors.com/PIX/CC-040.pdf

the TNC and BNC connectors are advertised as "dual-crimp". What does
this mean? "Dual" as in center in crimp and outer shield ferrule crimp?

As opposed to what? Single-crimp? That would be connectors that use the
center, solid conductor as the center pin and then crimp the shield
ferrule? Or...?

Newly (did you guess?) into small coax connectors and trying to get the
terminology straight...

Thanks.

The common BNC "crimp" connectors have you solder the center pin to the
center conductor of the cable, then assemble the outer with a crimp.

It works quite well in my experience, but I have yet to do this without
distorting the center insulator and having to trim it with an X-acto
knife to get it to fit, and I'm sure that in a critical application (like
TNC in the GHz) that I'd be creating an unpredictable impedance bump with
my hacking. *This is bad enough with cables that have solid dielectric; I
can only imagine the pain it would be with foam. *In a production
environment I'd almost certainly want to spring for the necessary crimp
tool to crimp the inner, if the quality were there.

(This is opposed to BNC connectors where you thread in a plug to capture
the outer conductor between the outer shell and a rubber insert. *It also
works well, but it is bulky and the connectors cost more. *And you're
still asked to solder the center pin on, with all of the accompanying
center insulator distortion issues).

--
Tim Wescott
Control systems and communications consultinghttp://www.wescottdesign.com

Need to learn how to apply control theory in your embedded system?
"Applied Control Theory for Embedded Systems" by Tim Wescott
Elsevier/Newnes,http://www.wescottdesign.com/actfes/actfes.html-Hide quoted text -

- Show quoted text -

Tim, I solder these on the N connectors all the time with no problems.
I have an old Weller soldering gun with the tip removed. I wedge the
pin between the two electodes on the gun, slide the pin over the
tinned center conductor and pull the trigger for a couple of seconds.
The pin cools almost instantly preventing deformation of the
insulation. Ive been doing this for over 20 years using the same gun.
This may take a little practice not to melt the insulation. I
remember *that it wasnt to bad getting the hang of it.

Jimmie

Hey OM
What size gun did you has a 240watt? How did you get the electrodes so
close together? Isn't the center pin of an N connector really small?
Or maybe you making lots 7/8 inch of heliax cables huh? Where the
center conductor is like 3/8 in copper tubing. Where the 3/8 inch
copper tubing would conduct all the heat away from the insulation?


73 OM
n8zu

raypsi wrote:
Hey OM
What size gun did you has a 240watt?
[snip]
73 OM
n8zu

Weller manufactures the following of that type of solder guns:

8200 = 140/100W
D550 = 260/200W
D650 = 300/200W

See http://www.cooperhandtools.com/brands/weller/index.cfm

I have an 8200. They make plain copper and iron-clad copper tips (the
iron-clad tips last longer). The beauty is that, when your only tip goes
open and the local hardware store is closed and you HAVE TO solder
something, 12ga solid copper wire can be formed into a tip.

vy 73,
Bryan WA7PRC

I still have a dual power (500/250) model Weller gun that a friend bought
while we were in the Air Force. He took it out of the package and dropped it
on the floor accidentially. A tiny piece of non functional plastic busted
off the top, so he threw it in the trash can (he was having a bad day). I
pulled it out of the trash, plugged it in and showed him that it still
worked fine. I then offered it back to him. He wanted no parts of it. I'm
still using it to this day. That 500 watt heating range actually comes in
handy now and then.

Ed Cregger

"Bryan" wrote in message
...
raypsi wrote:
Hey OM
What size gun did you has a 240watt?
[snip]
73 OM
n8zu

Weller manufactures the following of that type of solder guns:

8200 = 140/100W
D550 = 260/200W
D650 = 300/200W

See http://www.cooperhandtools.com/brands/weller/index.cfm

I have an 8200. They make plain copper and iron-clad copper tips (the
iron-clad tips last longer). The beauty is that, when your only tip goes
open and the local hardware store is closed and you HAVE TO solder
something, 12ga solid copper wire can be formed into a tip.

vy 73,
Bryan WA7PRC

On Dec 8, 11:12*pm, "Bryan" wrote:
raypsi wrote:
Hey OM
What size gun did you has a 240watt?
[snip]
73 OM
n8zu

Weller manufactures the following of that type of solder guns:

8200 = 140/100W
D550 = 260/200W
D650 = 300/200W

Seehttp://www.cooperhandtools.com/brands/weller/index.cfm

I have an 8200. *They make plain copper and iron-clad copper tips (the

Hey OM

But can you wedge a center pin from an N connector in between the
electrodes of your 140watt gun (without a tip in the gun) and solder
in the center conductor of a piece of coax? hmmm?

73 OM

n8zu