Term
| a frequency selective receiver capable of tuning in a desired frequency with a meter showing the strength of the input frequency. |
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Definition
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Term
| SLM is one of the 2 most used pieces of test equipment on your truck the other being a _? |
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Definition
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Term
| used to locate faults in cable. It is used to determine the distance of a known fault from a specific location. Reflectometer (TDR) |
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Definition
| Time Domain Reflectometer (TDR) |
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Term
| A TDR Is used to locate: bad or unknown splices shorts opens crushed cable or__? |
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Definition
| any other cable impedance mismatch |
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Term
| The velocity (speed) of an electrical signal on a cable as it relates to the speed of light in a vacuum is called the__? |
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Definition
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Term
| all models of TDR's will permit you to enter 2 types of cable info: the __ and the __? |
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Definition
| Velocity of Propagation and Impedance |
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Term
| the resistance of a circuit to alternating current |
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Definition
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Term
| On a TDR ___ can be found at the beginning of the cable caused by the time lag needed for the pulse width to launch into the cable |
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Definition
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Term
| On a TDR trace a ___could be at the end of the cable or a location where the cable has been cut |
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Definition
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Term
| A __ is a situation where the center conductor has come in contact with the shield. |
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Definition
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Term
| A ___ refers to a cable that has not been completely cut. |
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Definition
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Term
| A___ is when there is not complete contact between the center conductor and the shield. This could be from the cable being crushed. |
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Definition
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Term
| the best trouble shooting method used for determining problems on CATV system? |
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Definition
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Term
| ___ lessens the amount of time required to solve problems during an outage. |
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Definition
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Term
| The majority of our system problems are___? |
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Definition
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Term
| A __ meter used to measure AC and DC voltages current and resistance |
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Definition
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Term
| A __ performs the same functions as the VOM but has a digital display. |
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Definition
| Digital Multi Meter (DMM) |
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Term
| A __ is a root mean square meter that accurately measures AC voltages of signals other than pure sine waves |
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Definition
| Root Mean Square (true RMS) |
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Term
| A ___ is an adapter used to connect 2 different sizes of hardline cable |
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Definition
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Term
| A ___ is an adapter used to splice 2 hardline coax cables of the same size |
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Definition
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Term
| A consideration when setting up or testing LE's:___ |
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Definition
| Check inputs outputs and voltage |
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Term
| In cases where you have RF signals on both the input and output port but not at the tap port can be caused by? |
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Definition
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Term
| High Gain amp that creates relatively higher distortions levels |
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Definition
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Term
| It is very important to put fuses or shunts back into the same places when replacing splitters DC's and power inserter plates to avoid? |
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Definition
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Term
| When looking at a TDR trace a reflection with the same polarity as the launch reflection indicates an__? |
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Definition
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Term
| when using a TDR to find a fault you should? |
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Definition
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Term
| Attenuation of reverse signals is __ than that of the forward signal. |
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Definition
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Term
| Unlike forward signals that distributed throughout the network problems in the return path are additive due to what is known as the ? |
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Definition
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Term
| ___ occurs when corrosion of connectors creates a non linear junction which acts as a diode creating beats in the forward reverse spectrum. |
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Definition
| Common path distortions (CPD) |
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Term
| The unwanted signals entering the network can create a number of __ patterns on the TV screen. |
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Definition
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Term
| A Composite Triple Beat (CTB) greater than __ dB are far enough below desired carrier levels to be of little concern. |
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Definition
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Term
| In order to measure the effective power of a quassi square wave a __ must be used. |
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Definition
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Term
| A __ is mounted in the same housings used for hardline splitters and DC's. They contain diplex filers so the return signals don't have to pass through the forward eq and have power passing chokes to maintain AC power continuity |
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Definition
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Term
| you will not see a ghost whose level is more than __ dB below the desired carrier. |
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Definition
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Term
| When ingress is allows a locally broadcast TV channels signal to enter the TV along with channels signal supplied by the network is called a __? |
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Definition
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Term
| __ states that current is directly proportional to voltage and inversely proportional to resistance |
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Definition
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Term
| what might cause a roll off or suck out at frequencies around and above 800MHz |
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Definition
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Term
| A __ is used to compensate for the tilted loss of the cable |
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Definition
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Term
| What does DOCSIS stand for? |
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Definition
| Data over cable service interface specifications |
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Term
| To avoid interference with the aeronautical navigation systems ,cable carriers, are required to be offset by? |
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Definition
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Term
| what are the aeronautical frequency bands? |
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Definition
| 108 - 137 MHz and 225-400 MHz |
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Term
| when using the ground based system during testing how much of the system should be tested for CLI? |
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Definition
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Term
| what year did the FCC have to reconsider and open new proceedings to establish new rules for signal leakage? |
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Definition
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Term
| signal leakage was often referred to as what? |
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Definition
| electromagnetic radiation |
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Term
| in what year did the FCC require that systems perform a CLI test annually? |
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Definition
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Term
| during a flyover monitoring is done using carriers at what frequency range? |
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Definition
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Term
| the signal leakage log must be kept on file for a minimum of how many years? |
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Definition
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Term
| only leaks greater than __ per meter are used for CLI calculations |
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Definition
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Term
| the FCC specs states that the dipole be located as follows? |
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Definition
| 10ft from cable, 10ft from the ground, 10ft from any other conductor |
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Term
| the purpose of the EQ's used in the CATV amp is to? |
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Definition
| compensate for cable loss |
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Term
| a ghost can be caused by? |
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Definition
| direct pickup of off-air signals by the TV receiver connected to the cable, poor return loss at the tap feeding the TV and a missing end of line termination and a channels reflected and direct signals picked up by the head end attenna |
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Term
| the definition of ingress is? |
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Definition
| undesired signals entering the cable plant |
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Term
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Definition
| an unwanted carrier entering the system co channel interference amp levels running several dB higher than specified. |
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Term
| the proper way to write decibel/millivolt is? |
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Definition
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Term
| a stationary or slightly moving vertical bar in the video portion of a channel carried on the cable system is caused by? |
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Definition
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Term
| the log (to the base of 10) of 1000 is? |
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Definition
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Term
| the input and output levels of a cascade of amps are raised by 3db.At the output of the last amp C/N ratio has? |
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Definition
| C/N has improved by 3db and C/XMOD had degraded by 6db |
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Term
| just two RF carriers, one at 55MHz and another at 61MHz are producing beats in an amp. The only 2nd order frequencies these carriers could produce on are? |
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Definition
| 110MHZ 6MHz 116MHz 122MHz |
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Term
| the signal level at the input to a tap is 32dBmV. You measure 15dBmV at the tap port. what is the tap value? |
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Definition
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Term
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Definition
| 6 MHz "beats" in the return band pass |
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Term
| levels of composite second order(CSO) 60 dB below a video can cause? |
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Definition
| no discernible picture degradation |
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Term
| the greatest quantity of discrete third order beats that can be found near any channels carrier in a 77 channel system is? |
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Definition
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Term
| if you increase the cascade of amps in your system from 4 to 8 (using the same type amp and all at the same levels)the third order distortions (caused by amps) will measure approx. __ dB worse at the output of the fourth amp? |
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Definition
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Term
| if the input levels to a single manual amp are raised by 2 the C/N ratio will?? |
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Definition
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Term
| the amp component used to compensate for fluctuations of the input signals is known as an? |
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Definition
| automatic gain control (AGC) |
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Term
| the noise generated by the 75 ohm coax in your cable system is considered to be at an approx. dBmV level of? |
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Definition
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Term
| the input of a single amp with an 8 dB noise figure is connected to a 75 ohm carrier generator that adds no noise of its own. the generator is adjusted to deliver a +10 dBmV level to the amp. What is the C/N ratio at the output of the amp |
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Definition
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Term
| the C/CTB distortion of 2 main amps in cascade is 79dB. 2 LEs in cascade also produce a C/CTB ratio of 79dB. what will be the end of line C/CTB distortions when the 2 main amps feed the LE? |
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Definition
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Term
| 3 carriers A,B,C are introduced into an amp at a high enough level to produce measurable 3rd order beats. Which letter below contains a frequency that is not a 3rd order beat? |
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Definition
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Term
| picture degradation caused by hum modulation appears in the picture as? |
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Definition
| one or two horizontal bars |
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Term
| the primary function of an amps EQ is to? |
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Definition
| provides a nearly flat input to the amps 1st stage, compensate for the cable preceding the amp |
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Term
| the return EQ is located at? |
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Definition
| at the return modules output |
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Term
| the primary reason for tilting the output of a forward amp is to? |
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Definition
| reduce distortion and provide flatter inputs to subscribers terminals |
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Term
| which of the following would not be included in the amps data box? |
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Definition
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Term
| true or false- stand should always be pulled from the bottom of the reel? |
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Definition
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Term
| what is used to connect 2 devices together? |
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Definition
| housing to housing adapter |
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Term
| warning tape is buried at a depth of? |
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Definition
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Term
| __ is the tension in the cable caused by the weight of the cable on the reel brakes |
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Definition
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Term
| true or false- if an aerial span is 250ft or longer, 2 expansion loops are placed at each pole? |
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Definition
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Term
| expansion loops are formed with a device called a? |
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Definition
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Term
| before passing the lasher around a pole what must be attached? |
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Definition
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Term
| true or false- double lashing wire is only used with optic cable installation? |
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Definition
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Term
| how far should the lasher be pulled before removing the mechanical bender? |
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Definition
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Term
| the excess cable left at each splicing location is known as an? |
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Definition
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Term
| the __ is the load bearing component of an aerial hardline cable installation? |
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Definition
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Term
| the type of guy used when the strand changes directions is called a? |
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Definition
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Term
| underground hardline cable is manufactured with a layer of __ that helps to protect nicked or damaged cable from water damage? |
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Definition
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Term
| __ works well for cleaning for cleaning coring tools and keeping them in good condition? |
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Definition
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Term
| true or false- channel lock pliers are used to hold one part of the connector while tightening the other |
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Definition
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Term
| a coring tool is used to? |
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Definition
| remove the dielectric from inside the aluminum shield |
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Term
| what situation would require the use of a travelling ground? |
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Definition
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Term
| a __ is placed in front of the lasher when pulling multiple cables? |
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Definition
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Term
| what tool is used to measure cable tension? |
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Definition
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Term
| located underground telephone lines are designated with which color mark? |
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Definition
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Term
| which connector is used to connect 2 pieces of the same size hardline cable together? |
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Definition
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Term
| true or false- seizure screws should be made as tight as possible to prevent loosening caused by road vibrations? |
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Definition
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Term
| a ___ is used to maintain the tension in the strand through the pole line hardware during installation? |
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Definition
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Term
| a shotgun is another name for? |
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Definition
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Term
| what is placed on each cable to ensure that the max allowable tension for that cable is not exceeded? |
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Definition
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Term
| by divide and conquer we mean? |
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Definition
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Term
|
Definition
| remains critical for any activities in the network |
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Term
| the __ and the __ are the 2 most used pieces of test equipment |
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Definition
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Term
| true or false- a DMM is only used to measure voltages? |
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Definition
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Term
| what is NOT one of the DMM /VOM's controls? |
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Definition
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Term
| when looking at a TDR trace, a reflection with the same polarity as the launch reflection indicates a? |
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Definition
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Term
| one of the additional components that may come with your locator is |
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Definition
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Term
| when using a TDR to find a fault you should? |
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Definition
| test the cable from both ends |
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Term
| the underground locating color for power is? |
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Definition
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Term
| when a loss of AC voltage is determined to be a power company problem you should do what? |
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Definition
| notify the power company and follow your system's guidelines stand by generator procedures |
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Term
| it is very important to put the fuses and shunts back into the same places when replacing splitter, DC, and power inserter plates to avoid? |
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Definition
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Term
| if fuses continue to blow, chances are there is a? |
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Definition
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Term
| these are things you need to consider when setting up or testing a LE is? |
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Definition
| inputs, AC, and DC voltage levels, and outputs |
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Term
| if you do not have a power meter you can test a nodes lights input power with a? |
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Definition
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Term
| the reverse signals are usually in the frequencies ranging from? |
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Definition
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Term
| attenuation of reverse signals is __ than that of the forward signals. |
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Definition
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Term
| one method of conducting the annual CLI test is by? |
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Definition
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Term
| from what distance should a leak be measured for testing purposes? |
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Definition
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Term
| one method for pin pointing a leak is known as? |
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Definition
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Term
| these are some causes of signal leakage |
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Definition
| poorly shielded TV tuner, improperly tightened connectors, cracked cable |
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Term
| who is affected by a downstream leak? |
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Definition
| anyone watching video services from the leak downstream anyone using the shared frequencies |
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Term
| who is affected by an upstream leak? |
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Definition
| anyone on that node using data services, VOD, VOIP,,PPV,and the shared frequencies |
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