Term
|
Definition
|
|
Term
|
Definition
| Used to drive trace on oscilloscope or spectrum analyzer |
|
|
Term
|
Definition
| Frequency / The Speed of Light |
|
|
Term
|
Definition
|
|
Term
|
Definition
| loop resistance per unit lenght of cable given in Ohms/length |
|
|
Term
|
Definition
| the ammount of timeit takes an AC waveform to complete one cycle |
|
|
Term
|
Definition
| The peak value of an AC waveform |
|
|
Term
|
Definition
| Ohm's law as a formula written in it basic form |
|
|
Term
|
Definition
| Design philosophy where the loss of cable and other passive devices before an amplifier station equal th gain of the amplifier station |
|
|
Term
|
Definition
| The difference attenuation or amplifier gain between lower and higher frequencies o the cable network |
|
|
Term
|
Definition
| Differenece in gain between the ends of a band of frequencies |
|
|
Term
| To long of a center conductor on a hard line pin connector can cause |
|
Definition
| roll off or suck out at frequencies around and above 800 MHz |
|
|
Term
|
Definition
| A gradual or sharp attneuation of gain ( versus frequencey at either of both ends the spectrum |
|
|
Term
|
Definition
| A sharp reduction in the amplitude of a narrow band of frequencies within the networks overall frequencey response |
|
|
Term
|
Definition
| An active device used to increase the level of an input signal, |
|
|
Term
|
Definition
| Small plug in device used to attenuate signals to there correct opererating levels |
|
|
Term
|
Definition
| Device used to reduce signal strength |
|
|
Term
|
Definition
| Compensates for cable attenuation loss as it varies as the square root of frequencey |
|
|
Term
|
Definition
| The effect of a particular type of amplifier has on the overall frequencey response |
|
|
Term
|
Definition
| the difference in amplitude between the most positive (peak and the most negative valley) levels of an electrical signal. |
|
|
Term
|
Definition
| lower adjacent channel bleeding unto upper channel |
|
|
Term
| beats, ghosting, co-channel interfernce, electrical interference |
|
Definition
|
|
Term
| Xmod, 2nd,3rd order beats, CTB,CSO |
|
Definition
|
|
Term
| Caused by direct off air pick up getting into cable system |
|
Definition
|
|
Term
| outline or multiple images of the primary TV picture |
|
Definition
|
|
Term
| Usually caused by signal reflections in the headend |
|
Definition
|
|
Term
| cable transmission speed is below the speed of light |
|
Definition
|
|
Term
|
Definition
| unwanted sum and or difference resulting from the mixing of 2 or more signals |
|
|
Term
| Major cause of Impulse Noise |
|
Definition
|
|
Term
|
Definition
| Interference in the return path signals caused by the reaction of dissimiliar metals |
|
|
Term
|
Definition
| As the temperature of a device chages so does the noise by .17 dB per 20 degress Fahrenheit |
|
|
Term
|
Definition
| Our reference temp and characteristic impedance of 75 Ohms |
|
|
Term
|
Definition
| The beggining of all calulations |
|
|
Term
|
Definition
| Putting signal onto the carrier |
|
|
Term
|
Definition
| Random noise that interferes with the TV picture |
|
|
Term
|
Definition
| 85 % below the speed of light |
|
|
Term
|
Definition
| minimum coherent distortion |
|
|
Term
|
Definition
| minimum coherent distortion |
|
|
Term
|
Definition
| typically manifests itself as a vertical bar in the viewd picture |
|
|
Term
|
Definition
| for every 1 dB an Amp is raised the carrier to cross modulation gets worse by 2 dB |
|
|
Term
| Major cause of Hum Modulation |
|
Definition
|
|
Term
A carrier-to-hum ratio of ____ is considered acceptable |
|
Definition
30 dB or equal or less than 3% |
|
|
Term
|
Definition
| amp circuit paths that allow AC to be directed onto specific distrobution cables |
|
|
Term
|
Definition
| Compares speed of light throuh material to the speed of light through a vacum |
|
|
Term
| Total Internal Relfection |
|
Definition
| Keeps light in the center of the fiber |
|
|
Term
|
Definition
| The distance between two points of like phase in a wave |
|
|
Term
|
Definition
| Seperates and combines forward and revers signals |
|
|
Term
|
Definition
| brings signal to a correct insertion level of the amp |
|
|
Term
|
Definition
| Seperates/Combines RF signals and AC |
|
|
Term
|
Definition
| Compensates for cable attenuation |
|
|
Term
|
Definition
| Gives a 3dB window for adjustments |
|
|
Term
|
Definition
|
|
Term
| 24/27 VDC is needed to operate the stations module in a |
|
Definition
|
|
Term
| FCC specs 43dB, Comcast 46dB |
|
Definition
|
|
Term
|
Definition
| Contains a directional coupler that feeds a single splitter |
|
|
Term
|
Definition
| Stops Rf from entering the power grid |
|
|
