COST 286 – Joint technical action 1 (JTA1)
... termination resistance is realized by adding a single wire connecting cable and ground. This wire was set to 150 Ohm resistance (i.e. loaded) via LD NEC card. The basic principle of obtaining a voltage drop on a 50 Ohm part of termination resistance is to simply multiply the current through the term ...
... termination resistance is realized by adding a single wire connecting cable and ground. This wire was set to 150 Ohm resistance (i.e. loaded) via LD NEC card. The basic principle of obtaining a voltage drop on a 50 Ohm part of termination resistance is to simply multiply the current through the term ...
Henning_Stofen_FRAC_G187
... Change the specified transformer output impedance to a realistic value with today’s equipment. ...
... Change the specified transformer output impedance to a realistic value with today’s equipment. ...
Test1spring03
... Your dormitory has a single connection to the cable service and each dorm room is connected on a transmission line as shown in the figure. A length of line connects your cable box to the main transmission line and the distance between the rooms is fairly constant. All the cable boxes are the same, Z ...
... Your dormitory has a single connection to the cable service and each dorm room is connected on a transmission line as shown in the figure. A length of line connects your cable box to the main transmission line and the distance between the rooms is fairly constant. All the cable boxes are the same, Z ...
Standing Waves - Oregon State EECS
... listed below. The line is driven with an incident wave with a 10V amplitude at f0 = 7.5MHz. Using pencil and paper, plot the voltage and current standing-wave patterns on the line and specify the voltage standing-wave ratio for each case. Use one graph for all the different loads. (a) Z0 /4 (b) 4Z0 ...
... listed below. The line is driven with an incident wave with a 10V amplitude at f0 = 7.5MHz. Using pencil and paper, plot the voltage and current standing-wave patterns on the line and specify the voltage standing-wave ratio for each case. Use one graph for all the different loads. (a) Z0 /4 (b) 4Z0 ...
THE INVENTION
... Unlike any existing system, this increase in system range is equal to that afforded by the high gain antenna at the end of the link path with the least gain and not the more usual algebraic sum of both. At least one high gain antenna is therefore absolutely essential AT EACH END of a long-range link ...
... Unlike any existing system, this increase in system range is equal to that afforded by the high gain antenna at the end of the link path with the least gain and not the more usual algebraic sum of both. At least one high gain antenna is therefore absolutely essential AT EACH END of a long-range link ...
Tutorial 2 with answers
... Calculate the electrical lengths of a single stub matching network with open circuit stub that will match a load impedance of 30 + j70 Ω to a 50 Ω input transmission line. (Answers: z L 0.6 j1.4 ; y L 0.26 j0.6 ; d = 0.275λ; l = 0.328λ) ...
... Calculate the electrical lengths of a single stub matching network with open circuit stub that will match a load impedance of 30 + j70 Ω to a 50 Ω input transmission line. (Answers: z L 0.6 j1.4 ; y L 0.26 j0.6 ; d = 0.275λ; l = 0.328λ) ...
Document
... X = Reactance, Z = Total Impedance, R = Resistance, θ = Z Angle, and i or j = square root of -1 Above, the positive X values plot into one quadrant of a Cartesian graph’s RHP, negative X values plot in the other quadrant directly below this one ...
... X = Reactance, Z = Total Impedance, R = Resistance, θ = Z Angle, and i or j = square root of -1 Above, the positive X values plot into one quadrant of a Cartesian graph’s RHP, negative X values plot in the other quadrant directly below this one ...
Processor, Bus Driver, and Latches
... Amplification must take place to guarantee proper A/D conversion: Amplification using LF356 op-amp (easy, low noise, cheap) ...
... Amplification must take place to guarantee proper A/D conversion: Amplification using LF356 op-amp (easy, low noise, cheap) ...
2007 General Pool Q and A - G5 Only
... Why is impedance matching important? So the source can deliver maximum power to the load G5A09 Ohm ...
... Why is impedance matching important? So the source can deliver maximum power to the load G5A09 Ohm ...
must be adjusted as shown for the CLASS E PA. More power is
... Universal FAT5 PA (40m version) The waveform (taken at one of the DRAIN outputs) must be adjusted as shown for the CLASS E PA. More power is (affectively) available when the waveform is wrongly adjusted (narrower or with humps in the trailing edge (R/H side of waveform)) but it will not be running i ...
... Universal FAT5 PA (40m version) The waveform (taken at one of the DRAIN outputs) must be adjusted as shown for the CLASS E PA. More power is (affectively) available when the waveform is wrongly adjusted (narrower or with humps in the trailing edge (R/H side of waveform)) but it will not be running i ...
k18v2. fm transmitter
... problem with this type of circuit is that any external load (antenna) will change the operating frequency. This is normal. If the antenna load is heavy then the transmitter could be moved off frequency by 1MHz, or perhaps even more. The tuned coil, L1, has two output tappings for the antenna connect ...
... problem with this type of circuit is that any external load (antenna) will change the operating frequency. This is normal. If the antenna load is heavy then the transmitter could be moved off frequency by 1MHz, or perhaps even more. The tuned coil, L1, has two output tappings for the antenna connect ...
Receiving properties of Antennas - University of San Diego Home
... RECEIVING PROPERTIES OF ANTENNAS In the discussion of antennas and antenna arrays, we have analyzed their operation in the transmitting mode. In the transmitting mode, a voltage source is applied to the input terminals of the antenna, setting up currents and charges on the antenna. The time-varying ...
... RECEIVING PROPERTIES OF ANTENNAS In the discussion of antennas and antenna arrays, we have analyzed their operation in the transmitting mode. In the transmitting mode, a voltage source is applied to the input terminals of the antenna, setting up currents and charges on the antenna. The time-varying ...
Video Transcript - Rose
... We’re looking for the equivalent impedance between terminals G and H. The circuit, however, is given with all of its elements specified in terms of admittance. We’ll first convert those to impedance, then work the problem entirely in terms of impedance. Recall that impedance is the reciprocal of adm ...
... We’re looking for the equivalent impedance between terminals G and H. The circuit, however, is given with all of its elements specified in terms of admittance. We’ll first convert those to impedance, then work the problem entirely in terms of impedance. Recall that impedance is the reciprocal of adm ...
Exam-Prep Jepperdee
... How does the gain of a 2-element deltaloop compare to the gain of a two-el quad ...
... How does the gain of a 2-element deltaloop compare to the gain of a two-el quad ...
Chapter 3: From lumped to distributed elements
... Coupling = P1/P3 (dB) Isolation = P1/P4 (dB) Directivity = P3/P4 = I-C, ability to isolate forward and backward waves 90° all limited bandwidth 180° Transformer 180° hybrid is not resonant, so it’s broadband Transformers Autotransformer (tapped coil) vs. Conventional transformer ...
... Coupling = P1/P3 (dB) Isolation = P1/P4 (dB) Directivity = P3/P4 = I-C, ability to isolate forward and backward waves 90° all limited bandwidth 180° Transformer 180° hybrid is not resonant, so it’s broadband Transformers Autotransformer (tapped coil) vs. Conventional transformer ...
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 ...
Video Transcript - Rose
... We need to convert this circuit into the phasor domain. I’ll begin by looking at the 2 H inductor. At 50 rad/s, its impedance is j ω L, so ω is 50, L is 2. A 2 H inductor looks like a j 100 Ω impedance. Similarly, for our 111 µF capacitor at 50 rad/s, it looks like –j 180 Ω. It’s the same for our 80 ...
... We need to convert this circuit into the phasor domain. I’ll begin by looking at the 2 H inductor. At 50 rad/s, its impedance is j ω L, so ω is 50, L is 2. A 2 H inductor looks like a j 100 Ω impedance. Similarly, for our 111 µF capacitor at 50 rad/s, it looks like –j 180 Ω. It’s the same for our 80 ...
Document
... – Identify the source sinusoid and note the frequency – Convert the source(s) to complex/phasor form (you can ignore the ωt component at this point) – Represent each circuit element by it's AC impedance. Impedances add like resistors. – Solve the resulting phasor circuit using standard circuit solvi ...
... – Identify the source sinusoid and note the frequency – Convert the source(s) to complex/phasor form (you can ignore the ωt component at this point) – Represent each circuit element by it's AC impedance. Impedances add like resistors. – Solve the resulting phasor circuit using standard circuit solvi ...
Exam-Prep Jepperdee: Technician Edition
... Operation of the game is almost intuitive, and you can make up your own rules. Each numeric point value on either game board is a hyperlink which reveals either a question or the Daily Double banner. Advancing the game one slide past the question (by clicking the screen) displays the answer. “Back” ...
... Operation of the game is almost intuitive, and you can make up your own rules. Each numeric point value on either game board is a hyperlink which reveals either a question or the Daily Double banner. Advancing the game one slide past the question (by clicking the screen) displays the answer. “Back” ...
Antenna tuner
An antenna tuner, a matchbox, transmatch, antenna tuning unit (ATU), or antenna coupler is a device connected between a radio transmitter or receiver and its antenna to improve power transfer between them by matching the impedance of the radio to the antenna’s feedline. Similar matching networks are used in other equipment (such as linear amplifiers) to transform impedance.An antenna’s impedance is different at different frequencies. An antenna tuner matches a radio with a fixed impedance (typically 50 Ohms for modern transceivers) to the combination of the feedline and the antenna; useful when the antenna’s feedline impedance is unknown, complex, or otherwise different from the transceiver. Coupling through an ATU allows the use of one antenna on a broad range of frequencies. However, despite its name, an antenna ‘tuner’ actually only matches to the antenna feedline – an antenna ‘tuner’ does not and cannot change the resonant frequency of the aerial.Operating an antenna far from its design frequency and compensating with a transmatch is not as efficient as using a resonant antenna with a matched-impedance feedline. If there is still a high SWR (multiple reflections) in the feedline beyond the ATU, any loss in the feedline increases, heating the wire instead of sending out a signal. Additionally, losses in the ATU itself can also waste power.