instruments and methods - International Glaciological Society
... The receiver block diagram is shown in Figure 7. The signal from the antenna-matching unit goes through a 2 to 5 MHz band-pass filter or, alternatively, it is connected directly to the video amplifier input. The video signal is amplified 20 dB in each stage of the video amplifier before it goes to a ...
... The receiver block diagram is shown in Figure 7. The signal from the antenna-matching unit goes through a 2 to 5 MHz band-pass filter or, alternatively, it is connected directly to the video amplifier input. The video signal is amplified 20 dB in each stage of the video amplifier before it goes to a ...
The Tenna-Tune
... The IC-706 tune interface is very simple. The 10K ohm resistor “fools” the IC-706 into thinking that an antenna tuner is connected, and so the radio will be keyed in the 10-watt cw mode whenever the “key” pin (pin 1 on the antenna tuner interface) is connected to ground by the SPST toggle switch. I ...
... The IC-706 tune interface is very simple. The 10K ohm resistor “fools” the IC-706 into thinking that an antenna tuner is connected, and so the radio will be keyed in the 10-watt cw mode whenever the “key” pin (pin 1 on the antenna tuner interface) is connected to ground by the SPST toggle switch. I ...
Alternating Current
... 3. The voltage V applied across a circuit element is given by V = (20 V)(sin(100t) The current flowing through the element is given by I = (2 A)sin(100t) Determine the electrical power delivered to the element at time t = 2.0 ms. Ans : 13.8 W 4. A alternating voltage V is given by V = (12 V)(sin(1 ...
... 3. The voltage V applied across a circuit element is given by V = (20 V)(sin(100t) The current flowing through the element is given by I = (2 A)sin(100t) Determine the electrical power delivered to the element at time t = 2.0 ms. Ans : 13.8 W 4. A alternating voltage V is given by V = (12 V)(sin(1 ...
The current through an element is given in the figure
... power supply and a current meter. The current meter readout is somewhat unstable, unfortunately, which introduces error into the measurement. (a) Plot the measured voltage-versus-current characteristic. (b) Using a best-fit line, estimate the value of the resistance. ...
... power supply and a current meter. The current meter readout is somewhat unstable, unfortunately, which introduces error into the measurement. (a) Plot the measured voltage-versus-current characteristic. (b) Using a best-fit line, estimate the value of the resistance. ...
35. An electric current passing through a wire will produce
... A. The antenna should be installed not to expose people to radio frequency radiation from the antenna’s transmission B. The antenna should not be installed higher than you C. The antenna can be installed on a wet surface D. The antenna need to be painted to avoid human being and animals from collidi ...
... A. The antenna should be installed not to expose people to radio frequency radiation from the antenna’s transmission B. The antenna should not be installed higher than you C. The antenna can be installed on a wet surface D. The antenna need to be painted to avoid human being and animals from collidi ...
Chapter_2_Lecture_PowerPoint
... In order for the current to flow, there must exist a closed circuit. The figure below depicts a simple circuit, composed of a battery (e.g., a dry-cell or alkaline 1.5-V battery) and a lightbulb. Note that in the circuit of this figure, the current i flowing from the battery to the lightbulb is equ ...
... In order for the current to flow, there must exist a closed circuit. The figure below depicts a simple circuit, composed of a battery (e.g., a dry-cell or alkaline 1.5-V battery) and a lightbulb. Note that in the circuit of this figure, the current i flowing from the battery to the lightbulb is equ ...
AUTOMATIC HF LINEAR AMPLIFIER
... Only the RCU needs place near the operator. It features: Large 5’’ TFT color display. All amplifier’s parameters displayed simultaneously are more convenient to view. Antenna changeover is more comfortable. Enables amplifier operation by tranceiver ...
... Only the RCU needs place near the operator. It features: Large 5’’ TFT color display. All amplifier’s parameters displayed simultaneously are more convenient to view. Antenna changeover is more comfortable. Enables amplifier operation by tranceiver ...
Chapter 10 - Electrical, Antenna and RF Safety
... • Confine antenna radiation to the radiating elements. Provide a single, good station ground, and eliminate radiation from transmission lines. Use good coaxial cable, not open-wire lines or end-fed antennas that come directly into the transmitter area. • No person should near any transmitting antenn ...
... • Confine antenna radiation to the radiating elements. Provide a single, good station ground, and eliminate radiation from transmission lines. Use good coaxial cable, not open-wire lines or end-fed antennas that come directly into the transmitter area. • No person should near any transmitting antenn ...
1. Review of Circuit Theory Concepts
... Since the rest of the circuit only sees the iv characteristics of an element, different physical elements with similar iv ...
... Since the rest of the circuit only sees the iv characteristics of an element, different physical elements with similar iv ...
Flag Antenna Construction
... Nulls of selected stations in the design sector (south to west) were typically 18.8 dB with the Mini-Circuits T16-6T-X65 based feedpoint box and 22.6 dB with the "DIY" transformer based version. This says that the stray coupling effects of the coaxial feedline were reduced by the "DIY" design. In a ...
... Nulls of selected stations in the design sector (south to west) were typically 18.8 dB with the Mini-Circuits T16-6T-X65 based feedpoint box and 22.6 dB with the "DIY" transformer based version. This says that the stray coupling effects of the coaxial feedline were reduced by the "DIY" design. In a ...
Terms
... lowest loss at VHF and UHF? = Air-insulated hard line Why are UHF signals often more effective from inside buildings than VHF signals? = The shorter wavelength allows them to more easily penetrate the structure of buildings What antenna polarization is normally used for longdistance weak-signal CW a ...
... lowest loss at VHF and UHF? = Air-insulated hard line Why are UHF signals often more effective from inside buildings than VHF signals? = The shorter wavelength allows them to more easily penetrate the structure of buildings What antenna polarization is normally used for longdistance weak-signal CW a ...
Document
... Proper antenna tuning for clear long range communications Scalars provide only SWR and Return Loss, but NOT resonance information. Proper antenna tuning or diagnostic work requires a network analyzer The VIA Bravo is a 100KHz to 200MHz network analyzer for antennas, coils, circuits or components ...
... Proper antenna tuning for clear long range communications Scalars provide only SWR and Return Loss, but NOT resonance information. Proper antenna tuning or diagnostic work requires a network analyzer The VIA Bravo is a 100KHz to 200MHz network analyzer for antennas, coils, circuits or components ...
Electricity, Electronics and Ham Radio
... • The process can be reversed! • Radio waves hitting an antenna will induce high frequency currents in the antenna – they could be detected by a radio receiver. incoming Radio waves ...
... • The process can be reversed! • Radio waves hitting an antenna will induce high frequency currents in the antenna – they could be detected by a radio receiver. incoming Radio waves ...
Unit-I-2 EC6602-AWP
... antenna. This occurs because standing waves are set up along the length of the radiating element. The centre point is where the current is a maximum and the voltage is a minimum, this makes a convenient point to feed the antenna as it present a low impedance. For a dipole antenna that is an electr ...
... antenna. This occurs because standing waves are set up along the length of the radiating element. The centre point is where the current is a maximum and the voltage is a minimum, this makes a convenient point to feed the antenna as it present a low impedance. For a dipole antenna that is an electr ...
BSNL JTO Question Paper 2 2014
... constant of closed loop response to open loop response will be a) 1 : 1 b) 2 :1 c) 3 : 2 d) 2 : 3 78. Angle subtended by earth at geostationary communication satellite is a) 17.340 b) 51.40 c) 1200 d) 600 79.For data transmission phase modulation is commonly used because a) Phase can be varied from ...
... constant of closed loop response to open loop response will be a) 1 : 1 b) 2 :1 c) 3 : 2 d) 2 : 3 78. Angle subtended by earth at geostationary communication satellite is a) 17.340 b) 51.40 c) 1200 d) 600 79.For data transmission phase modulation is commonly used because a) Phase can be varied from ...