Field tech 1 Exam Questions and
Answers (Spectrum field tech 1 test)
Upstream frequency ranges - -between 5Mhz and 42Mhz
- Downstream frequency ranges - -Between 50MHz 860MHz
- Upstream frequency ranges - -5MHz and 42 MHz
- A 6 MHz downstream channel can hold - -2-4 hd channels or 8-12 standard
definition channels
- Egress - -When a signal leaks out of a cable
- Ingress - -when a signal leaks into a cable
- Field technicians are responsible from - -The tap to the CPE (customer
premise equipement)
- The most preferred BER is measured in ________ and is shown as _______ - -
Billions, 1.0E-09
- The headend - -Is the master facility for distributing signals over a cable
television system
- Charter passing modem receive levels (Rx) - -between -10dBmv and
+12dBmv
- Charter passing modem transmit levels (Tx) - -between 35dBmv and
50dBmv
- Charter passing MER - -35dBmv
- HD channels - -around 10Mbps each
- standard definition channels - -around 3-4Mbps each
- QAM (qaudarature apmlitude modulation) - -two amplitude modulated
waveforms at the same frequency that are phase shifted by 90 degrees
- QPSK (qaudrature phase shift keying) - -16 QAM, 64 QAM, and 256 QAM
are all exapmples of QAM modulation.
, - RF loss or gain - -is a relative measurement and is measured in dB
(decibels)
- RF measurements that are read from a meter are - -absolute
measurements and are measured in dBmV (decibels per millivolts)
- Analog signal loss - -is often gradual and reduces signal slowly
- Digital signal loss - -sudden where very small margin exists for difference
between a good picture and no picture (called the cliff effect)
- FM radio stations - -found between frequencies 88 MHz and 108 MHz
- frequency - -number of fully completed cycles per second
- Hertz - -one complete cycle
- MHz (megahertz) - -refers to millions of cycles per second
- 700 Mhz - -700 million hertz
- CATV, cable plant, or tight system - -is a closed system where rf energy
must be contained
- Signal leakage meters - -typically have antennas and are used to find
leaks in the plant. rubber ducky, dipole, and near field antennas
- 1 milivolt measured across 75 Ohms - -0 dBmV
- characteristic impedance of cable - -75 Ohms
- Impedance mismatches - -refer to defects within the plant, such as kinks ,
cuts, bends, water damage, and poor installation (bad fitings/ terminators.)
- Line toner/ multimeter - -assist in identifying lines
- torque wrenches - -typically 20-30 inch pounds to tighten f connectors
- compisite video/ RCA cables - -not high def, used to pass baseband video
and audio signals
- Foil i the outer portion of the braid - -should be removed when properly
preparing and F-connector
- HDMI - -uses a multi-pin connection for digital video and milti-channel
audio
Answers (Spectrum field tech 1 test)
Upstream frequency ranges - -between 5Mhz and 42Mhz
- Downstream frequency ranges - -Between 50MHz 860MHz
- Upstream frequency ranges - -5MHz and 42 MHz
- A 6 MHz downstream channel can hold - -2-4 hd channels or 8-12 standard
definition channels
- Egress - -When a signal leaks out of a cable
- Ingress - -when a signal leaks into a cable
- Field technicians are responsible from - -The tap to the CPE (customer
premise equipement)
- The most preferred BER is measured in ________ and is shown as _______ - -
Billions, 1.0E-09
- The headend - -Is the master facility for distributing signals over a cable
television system
- Charter passing modem receive levels (Rx) - -between -10dBmv and
+12dBmv
- Charter passing modem transmit levels (Tx) - -between 35dBmv and
50dBmv
- Charter passing MER - -35dBmv
- HD channels - -around 10Mbps each
- standard definition channels - -around 3-4Mbps each
- QAM (qaudarature apmlitude modulation) - -two amplitude modulated
waveforms at the same frequency that are phase shifted by 90 degrees
- QPSK (qaudrature phase shift keying) - -16 QAM, 64 QAM, and 256 QAM
are all exapmples of QAM modulation.
, - RF loss or gain - -is a relative measurement and is measured in dB
(decibels)
- RF measurements that are read from a meter are - -absolute
measurements and are measured in dBmV (decibels per millivolts)
- Analog signal loss - -is often gradual and reduces signal slowly
- Digital signal loss - -sudden where very small margin exists for difference
between a good picture and no picture (called the cliff effect)
- FM radio stations - -found between frequencies 88 MHz and 108 MHz
- frequency - -number of fully completed cycles per second
- Hertz - -one complete cycle
- MHz (megahertz) - -refers to millions of cycles per second
- 700 Mhz - -700 million hertz
- CATV, cable plant, or tight system - -is a closed system where rf energy
must be contained
- Signal leakage meters - -typically have antennas and are used to find
leaks in the plant. rubber ducky, dipole, and near field antennas
- 1 milivolt measured across 75 Ohms - -0 dBmV
- characteristic impedance of cable - -75 Ohms
- Impedance mismatches - -refer to defects within the plant, such as kinks ,
cuts, bends, water damage, and poor installation (bad fitings/ terminators.)
- Line toner/ multimeter - -assist in identifying lines
- torque wrenches - -typically 20-30 inch pounds to tighten f connectors
- compisite video/ RCA cables - -not high def, used to pass baseband video
and audio signals
- Foil i the outer portion of the braid - -should be removed when properly
preparing and F-connector
- HDMI - -uses a multi-pin connection for digital video and milti-channel
audio
