Splicing RG6/QS

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redbrickhat - 30 Aug 2006 03:58 GMT

I am trying to splice some RG6 Dual Shield and RG6 Quad Shield coaxial
cable.

I have some questions:

A). For stripping RG6 Quad Shield, one web site says to remove the
outer two layers of aluminum foil and braid, then fold back the inner
layers of foil and braid.

Another web site says to cut off the outer 3 layers of foil and braid,
leaving just the inner aluminum foil.

Would either of these work? Does folding back the aluminum foil and
braid make much of a difference?

B) The Radioshack "Heavy-Duty" F-crimp connectors I bought are supposed
to be for RG6 Dual Shield only, not Quad Shield, but they look exactly
the same as those for QS.

Can I use F connectors made for RG6 Dual Shield for RG6/QS?

C) Would there be much signal degradation if I connected a stretch of
RG6 Dual Shield to RG6 Quad Shield?

If they're both rated 75 ohms, there wouldn't be any wave reflections,
right?

D) For coaxial cable, are there any safety hazards I should be aware
of?

If I short the inner conductor to the outer layers of shielding, how
many amps would flow? Enough to damage appliances like a cable modem or
TV, etc.?

Thanks.

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lnh - 30 Aug 2006 05:53 GMT

> I am trying to splice some RG6 Dual Shield and RG6 Quad Shield coaxial
> cable.
[quoted text clipped - 10 lines]
> Would either of these work? Does folding back the aluminum foil and
> braid make much of a difference?

No. In order to have the shielding function correctly, you fold the
outer braid back, peel off the outer foil, fold back the inner braid,
and leave the inner foil alone.

If you cut the outer braid, it will not be electrically connected to the
inner shield, and no longer quad shield.

If you do not remove the outer foil, you will again insulate the two
layers. The foil is metal on one side, and plastic on the other.

> B) The Radioshack "Heavy-Duty" F-crimp connectors I bought are supposed
> to be for RG6 Dual Shield only, not Quad Shield, but they look exactly
> the same as those for QS.
>
> Can I use F connectors made for RG6 Dual Shield for RG6/QS?

If they fit.

AND USE THE PROPER CRIMPER. NO PLIERS!!

> C) Would there be much signal degradation if I connected a stretch of
> RG6 Dual Shield to RG6 Quad Shield?
>
> If they're both rated 75 ohms, there wouldn't be any wave reflections,
> right?

But you loose the shielding. In an area with strong RF transmitters, you
could see ingress. It is visible here in Houston, Texas.

> D) For coaxial cable, are there any safety hazards I should be aware
> of?
>
> If I short the inner conductor to the outer layers of shielding, how
> many amps would flow? Enough to damage appliances like a cable modem or
> TV, etc.?

No damage to electronics. Only if you have power inserters in the line
to drive remote amplifiers could you have a problem.

> Thanks.

Your welcome.

Reply to this Message

Pasta Nostra - 30 Jan 2007 14:44 GMT

If you use the Thomas and Betts compression fittings, The formula I use is from
this site....

http://www.hometech.com/learn/coaxterm.html

You leave on the inner foil and fold back the inner braid. The outer braid and
foil and jacket get tossed.

>> I am trying to splice some RG6 Dual Shield and RG6 Quad Shield coaxial
>> cable.
[quoted text clipped - 53 lines]
>
>Your welcome.

Spam goes well with eggs

Reply to this Message

lnh - 31 Jan 2007 06:39 GMT

> If you use the Thomas and Betts compression fittings, The formula I use is
> from
[quoted text clipped - 5 lines]
> and
> foil and jacket get tossed.

This is incorrect. See below.

> >> I am trying to splice some RG6 Dual Shield and RG6 Quad Shield coaxial
> >> cable.
[quoted text clipped - 55 lines]
>
> Spam goes well with eggs

Reply to this Message

Michael A. Terrell - 30 Aug 2006 18:31 GMT

> I am trying to splice some RG6 Dual Shield and RG6 Quad Shield coaxial
> cable.
[quoted text clipped - 31 lines]
>
> Thanks.

Either get the right connectors, or use double shielded cable.
Trying to use the wrong connector is just asking for trouble.

Signature

Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

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jasen - 01 Sep 2006 07:15 GMT

> I am trying to splice some RG6 Dual Shield and RG6 Quad Shield coaxial
> cable.
[quoted text clipped - 7 lines]
> Another web site says to cut off the outer 3 layers of foil and braid,
> leaving just the inner aluminum foil.

depends on the connector, the F connectors I'm familiar with have a part
that goes between the inner foil and inner braid so yeah stripping three
layers would be right for that, the

> Would either of these work? Does folding back the aluminum foil and
> braid make much of a difference?

does it make electrical contact with anything?

if they fit.

> C) Would there be much signal degradation if I connected a stretch of
> RG6 Dual Shield to RG6 Quad Shield?

frequency, and cable dependant,

> If they're both rated 75 ohms, there wouldn't be any wave reflections,
> right?

only small ones where the splces are, using QS wouldn't get rid of them.

> D) For coaxial cable, are there any safety hazards I should be aware
> of?

some types have a copper plated high tennsile steel inner conductor that
can pierce skin if mishandled... if attached to a tr4ansmitter it may
carry a high voltage, can't think of any other hazards.

> If I short the inner conductor to the outer layers of shielding, how
> many amps would flow?

depends on the application.

> Enough to damage appliances like a cable modem or TV, etc.?

no.

Bye.
Jasen

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Electronics Forum / Basics / January 2007

Splicing RG6/QS