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Field tech 1 Exam Questions with Accurate Solutions (Spectrum field tech 1 test)
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Field tech 1 Exam Questions with Accurate Solutions (Spectrum field tech 1 test)
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Field tech 1 Exam Questions with AccurateSolutions (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
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