Term
| The Purpose of the forward stage inner EQ is to: |
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Definition
| Compensate for cable loss, reduction in distortions by the output stages of amps, and determine the amp stations output tilt |
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Term
| The first stage of amplification for a high gain amp is primarily for its: |
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Definition
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Term
| The purpose of the input EQ is to: |
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Definition
| Make the input levels flat to the first part of amplification |
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Term
| One way to determine if a sweep problem is in the amp or before the amp is: |
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Definition
| Compare the output sweep to the input sweep |
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Term
| What is the main purpose of sweep in an HFC prevenative maintenance program: |
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Definition
| To ensure plant is in good working order and kept repaired |
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Term
| Which channels/bands is a sweep response derived without actual insertion of sweep energy |
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Definition
| All forward and reverse analog and digital channels |
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Term
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Definition
| Field unit injects pulses that are received upstream by headend |
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Term
| The tap leg of the directional couplers used test points have a loss: |
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Definition
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Term
| Internal losses in the return path of an amplifier are typically greater: |
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Definition
| For a multi-output amplifier |
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Term
| The Network set-up includes: |
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Definition
| Activation and alignment that applies to the complete network, including headend, fiber and RF |
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Term
| The balance of the system refers to: |
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Definition
| Proper EQ's, pads and adjustment of AGC controls for set-up of unity gain |
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Term
| The purpose of the Sweep is to: |
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Definition
| Bring plant closer to proper alignment of unity gain and simplifies balance and any required troubleshooting |
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Term
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Definition
| Fed from 1st the DC were levels are checked for padding and EQ |
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Term
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Definition
| Used to separate the forward portion of RF for amplification and re-introduce the output of the return |
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Term
| The insertion loss for a diplex filter is: |
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Definition
| Between 1 and 1.5dB at the upper RF spectrum |
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Term
| The 20dB directional coupler has an insertion loss: |
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Definition
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Term
| The insertion loss of a pad is: |
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Definition
| Depending upon the value of the pad |
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Term
| The input EQ's come in steps of: |
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Definition
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Term
| The insertion loss for an EQ at the high frequency is: |
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Definition
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Term
| The purpose of the cable equivalency is: |
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Definition
| When an EQ has attenuation opposite to that of cable (Inverse EQ) |
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Term
| The purpose of the Integrated Circuit (IC) is: |
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Definition
| Used for the first stage of amplification for a trunk multi-output station picked for its low noise figure between 8-15dB |
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Term
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Definition
| Used by the ALS or AGC to maintain output level and or tilt with the changes in the input signal |
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Term
| The purpose of the ALS is: |
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Definition
| Changes gain and tilt of an amp to hold the output level constant |
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Term
| The purpose of the AGC is: |
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Definition
| Automatically adjusts the gain of an amp so output levels stay constant |
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Term
| The purpose of the Thermal Control is: |
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Definition
Monitors changes in temps and causes an increase or decrease in attenuation
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Term
| The insertion loss for an ALS or AGC is: |
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Definition
| About 3dB when the gain is at max |
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Term
| The insertion loss for an ALS or AGC set to the middle of the range is: |
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Definition
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Term
| The purpose of the interstage EQ is: |
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Definition
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Term
| The mop-up/response network is: |
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Definition
| Used to correct for a frequency response problem seen at the output of the amp station where installed |
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Term
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Definition
| Deviations in response at the output of an amplifier or passive device when compared to it input |
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Term
| The sum of the input and interstage EQ should: |
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Definition
| Equal the amount of cable preceding the station |
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Term
| The purpose of the optical detector is: |
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Definition
| Recovers the RF information modulated onto the light carrier |
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Term
| For every dB of light equals: |
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Definition
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Term
| Gallium Arsenide (GaAs) is: |
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Definition
| A power double silicon IC |
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Term
| The optical modulation index is: |
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Definition
| The percentage of optical modulation per channel driving a laser |
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Term
| When power is doubled at the lasers optical output it is: |
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Definition
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Term
| To send TV channels on a fiber optic fiber these RF carriers are: |
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Definition
| Modulated onto a light carrier |
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Term
| How far down should the sweep telemetry be from the carrier of a nearby analog channel: |
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Definition
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Term
| How far down should the sweep insertion point level be from the sweep telemetry level: |
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Definition
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Term
| When is it important to verify the NONE is selected from the field units sweep reference: |
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Definition
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Term
| What is the forward telemetry frequency for the sweep: |
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Definition
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Term
| What is the return sweep frequency: |
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Definition
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Term
| What is pathtrac's frequency on the sweep: |
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Definition
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Term
| The formula for the reverse pad selection is: |
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Definition
| Amplifiers upstream gain minus the total span loss |
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Term
| What is the term signature response: |
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Definition
| Unique frequency response conisistent in the same devices made by a vendor |
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Term
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Definition
| Provides a snapshot of the actual frequency response at a given point in the system |
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Term
| When sweeping against a reference the result is: |
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Definition
| Shows the difference in frequency response between the point you are sweeping and the reference point |
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Term
| The sweep headend diplex filter combines: |
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Definition
| The forward signal and the reverse path signal |
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Term
| How many sweep points may be entered for each 6MHz segment of bandwidth: |
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Definition
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Term
| Sweep points are approximately: |
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Definition
| 2.9ms in duration and about 100kHz wide |
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Term
| Transmitter telemetry levels are adjustable from: |
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Definition
| 20-50dBmV in 2dB incriments |
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Term
| The reverse telemetry frequency is selected at the headend and not the: |
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Definition
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Term
| Applying power to the amplifiers is called: |
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Definition
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Term
| Balancing is referred to as: |
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Definition
| installing appropriate pads and eq's to achieve proper input levels to the first stage of amplification and installing correct interstage pads and eq's to correct output tilt levels according to design |
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Term
| The sum of the input and the inter stage eq should: |
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Definition
| Equal the amount in dB of cable preceding the station |
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