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Note: Some junction boxes are locked up,
please check with your cable/satellite provider before opening.
Determine whether it is just
one TV or several in your house that has poor reception. If it is
just one TV, then it is from the junction box outlet to that
particular TV where the damage is located. If all the TV's are
coming in fuzzy, then check the main in coax for damage, and proceed
to step 4 or 5.
 Once you have it narrowed
down to one coax, first check the ends for obvious damage as this is
where most will occur. If no damage is found, then you will have to
physically scan the entire length of the cable unless you have a TDR
(Time domain reflectometer).
 We will now assume you have
found the damaged portion or end, so the next two steps will be the
repair procedures.
 End piece repair- First cut
off the damaged end connector cleanly with a coax wire cutter. Now
using coax strippers, strip the outer layer insulation back about
1/2 of an inch evenly. You should now see some wire strands
surrounding a smaller white plastic insulator. Using your coax
strippers, strip about half of that down to the solid copper wire in
the middle.
So, you should now be left with a 1/4 inch
copper solid wire, and 1/4 of white insulator with wire strands
wrapped around it. Now pull back the wire strands over the outer
black insulation to expose the white insulator. Lastly, slide on a
RF coax crimp connector, and crimp down using a coax crimping tool.
(Use either a crimp style or twist on style) All that should be
protruding through the connector is the solid copper wire. All of
these tools and pieces are available at your local electronics
store.
See pictures below.
The strippers
Coax Stripped down
Coax with strands folded back
The coax crimped
 If you find a broken middle
section on your coax wire, you will have to cut out the broken area,
and perform step 4 on both cut ends. You should be left with two
male connector ends, now purchase a female-to-female connector, and
plug each male end into it. You have now spliced your coax the easy
way.
Coax female-to-female connector
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