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Old August 2nd 03, 09:03 AM
Ian White, G3SEK
 
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Default BNC Connector Power Ratings?

Brian Kelly wrote:
I'd like to build a compact antenna/100W rig patch panel instead
getting involved with big expensive coax switches. Could be done
nicely with BNC connectors & RG-58. Does anybody have a link to a site
which provides freq (160M-440) vs. power handling ratings for BNC
connectors?


I don't know about a website, but it has often been discussed here. Try
searching through
http://groups.google.com/advanced_group_search

It all comes down to the RF current through the center connection. This
is partly about skin effect and surface conductivity, but equally
important - and less predictable - is accurate assembly of the center
pins.

If at all possible, use connectors with captive center pins. This
removes the biggest source of inaccuracy in amateur assembly.

All the contact pressure in a BNC derives from the rubber washer inside
the bayonet ring. A good BNC should need quite a hard twist to make the
bayonet click into place... and in old surplus plugs, this springiness
does wear out.

Bottom line: BNCs in good condition are fine for 100W at 440MHz, so
they're good for that power level at any lower frequency too.


--
73 from Ian G3SEK 'In Practice' columnist for RadCom (RSGB)
Editor, 'The VHF/UHF DX Book'
http://www.ifwtech.co.uk/g3sek
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Old August 3rd 03, 04:47 AM
Tarmo Tammaru
 
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Default

BNCs are almost universally used for non microwave test equipment. So, I
have used them a lot. My biggest problem has been the shield not making good
contact with the body of the connector after a while. By far, I have had the
fewest problems with the kind where a sleeve is crimped over the outer
insulation to provide strain relief. On the better connectors, this sleeve
is about an inch long. You do not want to allow any flexing of the bare
shield.

Tam/WB2TT
"Brian Kelly" wrote in message
om...
I'd like to build a compact antenna/100W rig patch panel instead
getting involved with big expensive coax switches. Could be done
nicely with BNC connectors & RG-58. Does anybody have a link to a site
which provides freq (160M-440) vs. power handling ratings for BNC
connectors?

Tnx,

w3rv



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Old August 5th 03, 01:37 PM
Jimmy
 
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Default

I used to think crimp on connectors were just the lazy mans way of putting
on a BNC. After 15 years of using them I have come to believe they are
better than the old style. I just removed an old radar system from service
whith hundreds of BNC connections. None of the crimp ons were bad, not so
for the others. I am sure this was the cause of many of the intermitent
problems that had plagued this radar.

"Tarmo Tammaru" wrote in message
...
BNCs are almost universally used for non microwave test equipment. So, I
have used them a lot. My biggest problem has been the shield not making

good
contact with the body of the connector after a while. By far, I have had

the
fewest problems with the kind where a sleeve is crimped over the outer
insulation to provide strain relief. On the better connectors, this sleeve
is about an inch long. You do not want to allow any flexing of the bare
shield.

Tam/WB2TT
"Brian Kelly" wrote in message
om...
I'd like to build a compact antenna/100W rig patch panel instead
getting involved with big expensive coax switches. Could be done
nicely with BNC connectors & RG-58. Does anybody have a link to a site
which provides freq (160M-440) vs. power handling ratings for BNC
connectors?

Tnx,

w3rv





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