CORRELATION 2 - EST 41-80

• The difference between signal strength at a given point and a reference level is LEVEL
• Interfering effect of noise, C message weighted, is dBmc
• F1A weighting refers to dBrnc
• Reading a 58 dBrnC on your Western Electric 3A test set at a +7 test point is equal to 51 dBrnc0
• Reading a 58 dBrn, at a +7 test point is equal to 46 dBa0
• A reading of -50 dBm on the disturbing pair, and -80 on the disturbed pair equals 30 dB of crosstalk coupling
• Power is DEFINITE AMOUNT OF ENERGY PER TIME PERIOD
• 15 dBa F1A weighted, equals -70 dBm
• A measurement of -75 dBm, C-message weighted, would be 15 dBrnc
• At what power level does a 1 KHz tone cause zero interference (144 weighted)? -90 dBm
• Reference noise is A NOISE THAT CREATES THE SAME INTERFERING EFFECT AS A 1000 Hz, -90dBm TONE and A NOISE THAT CREATES ZERO DBRN IN A VOICE CHANNEL
• A practical dBrn measurement will almost always in a POSITIVE number
• What is the reference level for noise measurement, F1A weighted? -85 dBm
• What is the reference tone level for dBrn? -90 dBm
• What is the reference tone level for dBa? -85 dBm
• Atmospheric noise becomes less severe at frequencies ABOVE 30 MHz
• ATMOSPHERIC NOISE is the noise whose sources are in a category different from the other three
• DISTANT STARS ARE ANOTHER SOURCE OF MAN-MADE NOISE is the false statement
• SUN is not a source of industrial noise
• A RANDOM VOLTAGE ACROSS THE RESISTOR DOES NOT EXIST is the false statement
• If the value of the resistor creating thermal noise is doubled, the noise power generated is UNCHANGED
• IMPULSE NOISE VOLTAGE IS DEPENDENT ON BANDWIDTH is the false statement
• One of the following is not a useful quantity for comparing the noise performance receivers: INPUT NOISE VOLTAGE
• Noise figure is defined as an unwanted form of energy tending to interfere with the proper and easy reception and reproduction of wanted signals
• Most internal noise comes from THERMAL AGITATION
• Which of the following is not a source of external noise: THERMAL AGITATION
• Noise can be reduced by NARROWING THE BANDWIDTH
• Noise at the input to the receiver can be as high as several MICROVOLTS
• The circuit that contributes most of the noise in a receiver is the MIXER