Construction Coordinator (CC I – II): Questions With
Tailored Solutions
Why are pin-type hardline connectors the preferred type of connector for
attaching hardline coaxial cable to equipment housings in today's networks?
Correct Answer - Over the years, intermittent operation, low-frequency roll-
off, and common path distortion (CPD) issues have been attributed to feed-
through connectors.
What type of adapter is used for permanent or temporary jumper installation
in place of damaged hardline coaxial cable or equipment hookup? Correct
Answer - Pin-to-F female adapters.
What should be worn when cutting and preparing hardline coaxial cable for
connector attachment? Correct Answer - Leather work gloves.
How should a knife be used when preparing hardline coaxial cable for
connector attachment? Correct Answer - To score the aluminum shield
that must be broken and then removed.
What is a consequence of cutting hardline coaxial cable with conventional side
cutters? Correct Answer - The end of the cable is crushed and deformed,
which makes coring the dielectric and sliding connector parts onto the cable
difficult.
When using a single-purpose coring tool, what is done before the coring tool
can be used to cut and remove the dielectric? Correct Answer - The
appropriate length of aluminum shield and dielectric must be removed, to
expose the cable center conductor.
If the hardline coaxial cable center conductor is too short after coring the
dielectric with a combination coring tool, what should be done? Correct
Answer - Clean out any dielectric and aluminum trimmings from the cable
and the tool and continue coring to the correct depth.
What is different about preparing QR hardline coaxial cable for connector
installation compared to all other types? Correct Answer - QR cable is first
, cored and the aluminum shield is stripped before the polyethylene jacket is
removed to the proper length, the reverse of other cable types.
What can be said about a straight splice connector? Correct Answer - It is
essentially two hardline connectors with a common interface.
How far beyond a pin connector should the shrink tubing overlap the coaxial
cable? Correct Answer - At least eight inches after shrinking.
How can signal leaks (egress) from hardline coaxial cable occur? Correct
Answer - Through cracks in the shield where the cable is bent, or tiny holes
in the shield.
What is the return loss in coaxial cable? Correct Answer - The difference in
decibels (dB) between the signal power applied to a terminated cable and the
reflected signal power.
What happens when there is an impedance mismatch between the coaxial
cable and the load? Correct Answer - Some signal energy is transferred to
the load, with the remainder reflected along the coaxial cable back to the
source.
What is the attenuation through 1,600-feet of 0.750 cable at 600 MHz and
120° F, when at 68° F and 600 MHz the cable attenuation rate is 1.31 decibels
(dB)/100 feet? (Be sure to factor in the higher temperature.) Correct
Answer - 22.05 dB.
If the attenuation through a span of coaxial cable at 75 MHz is 2.5 dB, what
will be the approximate attenuation at 300 MHz? Correct Answer - ??? 4 x
2.5 dB, or 10.0 dB. ???
What is the coaxial cable velocity of propagation (VoP)? Correct Answer -
The rate that radio frequency (RF) signals travel through the coaxial cable
versus the speed that RF signals travel in a vacuum or free space.
Why was the impedance for the broadband cable industry standardized at 75
ohms (Ω)? Correct Answer - At 75 Ω characteristic impedance, the coaxial
cable has minimal attenuation, with adequate breakdown voltage and power
carrying capacity.
Tailored Solutions
Why are pin-type hardline connectors the preferred type of connector for
attaching hardline coaxial cable to equipment housings in today's networks?
Correct Answer - Over the years, intermittent operation, low-frequency roll-
off, and common path distortion (CPD) issues have been attributed to feed-
through connectors.
What type of adapter is used for permanent or temporary jumper installation
in place of damaged hardline coaxial cable or equipment hookup? Correct
Answer - Pin-to-F female adapters.
What should be worn when cutting and preparing hardline coaxial cable for
connector attachment? Correct Answer - Leather work gloves.
How should a knife be used when preparing hardline coaxial cable for
connector attachment? Correct Answer - To score the aluminum shield
that must be broken and then removed.
What is a consequence of cutting hardline coaxial cable with conventional side
cutters? Correct Answer - The end of the cable is crushed and deformed,
which makes coring the dielectric and sliding connector parts onto the cable
difficult.
When using a single-purpose coring tool, what is done before the coring tool
can be used to cut and remove the dielectric? Correct Answer - The
appropriate length of aluminum shield and dielectric must be removed, to
expose the cable center conductor.
If the hardline coaxial cable center conductor is too short after coring the
dielectric with a combination coring tool, what should be done? Correct
Answer - Clean out any dielectric and aluminum trimmings from the cable
and the tool and continue coring to the correct depth.
What is different about preparing QR hardline coaxial cable for connector
installation compared to all other types? Correct Answer - QR cable is first
, cored and the aluminum shield is stripped before the polyethylene jacket is
removed to the proper length, the reverse of other cable types.
What can be said about a straight splice connector? Correct Answer - It is
essentially two hardline connectors with a common interface.
How far beyond a pin connector should the shrink tubing overlap the coaxial
cable? Correct Answer - At least eight inches after shrinking.
How can signal leaks (egress) from hardline coaxial cable occur? Correct
Answer - Through cracks in the shield where the cable is bent, or tiny holes
in the shield.
What is the return loss in coaxial cable? Correct Answer - The difference in
decibels (dB) between the signal power applied to a terminated cable and the
reflected signal power.
What happens when there is an impedance mismatch between the coaxial
cable and the load? Correct Answer - Some signal energy is transferred to
the load, with the remainder reflected along the coaxial cable back to the
source.
What is the attenuation through 1,600-feet of 0.750 cable at 600 MHz and
120° F, when at 68° F and 600 MHz the cable attenuation rate is 1.31 decibels
(dB)/100 feet? (Be sure to factor in the higher temperature.) Correct
Answer - 22.05 dB.
If the attenuation through a span of coaxial cable at 75 MHz is 2.5 dB, what
will be the approximate attenuation at 300 MHz? Correct Answer - ??? 4 x
2.5 dB, or 10.0 dB. ???
What is the coaxial cable velocity of propagation (VoP)? Correct Answer -
The rate that radio frequency (RF) signals travel through the coaxial cable
versus the speed that RF signals travel in a vacuum or free space.
Why was the impedance for the broadband cable industry standardized at 75
ohms (Ω)? Correct Answer - At 75 Ω characteristic impedance, the coaxial
cable has minimal attenuation, with adequate breakdown voltage and power
carrying capacity.
