My new Amphenol connectors use Teflon insulators which is white with a
waxy like feel. Teflon handles moderate temperature and voltage well,
BUT, don't apply a really hot soldering to it as the byproducts produced
are poisonous. Clear could be plexiglass, Lexan, or ? Both are good
insulators, but plexiglass does not stand up well to heat.
I just went to the shop: The surplus 90s are clearly marked Amphenol in
"raised" letters. Some have clear plastic and some have a gray
insulator. Please note, these are old, and that is probably well over
40 years old.
Teflon has at least three down sides. They are its response to very high
heat, it tends to "cold flow" which is not usually a problem, in ham
installations, and it's expensive!. It is much more resistant to center
conductor migration than foam dielectric. HOWEVER Teflon makes a very
poor mechanically loaded insulator.
My new Amphenol connectors, UHF, N-Type, and bulkhead connectors all
have White Teflon insulators.
"I think" you will find "really old" Amphenol PL259s have phenolic
insulators as they were made before Teflon was invented. I actually had
some of those when I was a Novice 55 years ago. I believe Gary was
correct,when he said the good ones have the male center screws into the
other pin.
Now days I usually use crimp connectors. They are quick, easy, and
mechanically stronger than the solder type PL259s.
73
Roger (K8RI)
On 5/6/2016 Friday 9:36 PM, Don W7WLL wrote:
Got a lot of feedback re the subject connectors and overwhelming the suggestion
was to use Amphenol parts, which I usually do (but I have a lot of inherited
connectors).
I had never paid a lot of attention to connectors for my 8, 213 and similar
coax’s, but I did note that the color of the insulator varied. After reading
specs that the Amphenol used PTFE (all of my Amphenol of a later vintage appear to be
clear insulation), I took a look a some of the right angles I had plus a pile of my
barrels. Of those NOT marked Amphenol, almost all had no readable brand or number
imprinted. I also noticed that the insulation was either white or shades of grey.
I’m not knowledgeable on plastics and am now curious to know what the white or grey material used in
these ‘other brand’ connectors might be (I’m dangerous enough to know a lot of
plastics do come in several colors).
Don T
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73
Roger (K8RI)
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