# Questions tagged [loss]

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### RF over-the-air signal loss inside an RF chamber

For cabled/conducted testing, path loss between DUT & Test equipment is calculated from cumulative insertion loss from any adapters, co-axial cables, attenuator pads etc. But for over-the-air/...
188 views

### Do I need to consider shunt admittance for line losses doing load flows?

If I have a long transmission line (Pi model) the current just go through the equivalent impedance of the line, but I've seen demonstrations that include this shunt admittance as if the current flows ...
31 views

### Power dissipation BJT transistor as voltage follower

Following the discussion from this thread I am finalizing my calculations. I am not sure that I am calculating the power dissipation correctly. Given the following circuit I need to operate the opamp ...
133 views

### Cascade impedances and Return Loss

I have 75 Ohm connector connected to 75 Ohm Load trough 50 OHM PCB to PCB connector. What trace impedance should be on PCBs to get optimal Return Loss?
175 views

### what does Loss Tangent means in capacitor?

As we know the definition of Loss Tangent in capacitor which it is: When a sinusoidal alternating voltage is applied to an ideal capacitor, the current advances by pi/2 in phase. In the case of a ...
37 views

### Unexpected values from insertion loss calculation in IEEE P802.3cg documentation

I'm looking at the insertion loss calculations from an IEEE document on P802.3cg (10SPE Ethernet). On pages 6 and 7 they talk about insertion losses over the cabling in a multi-drop scenario. I'm ...
52 views

### Coax cable loss drops by approximately 0.5 dB at a specific frequency

I am trying to understand why the measured loss of our coaxial cable is decreased exactly at a specific frequency. My understanding is that the loss should be linear with the frequency. However, there ...
19 views

### Reading core loss graph of an inductor core

The question is somehow unrelated but I hope someone answers, From the above graph, how can I get the value of 0.3T line @ 25kHz ? The scales in the axes confused my mind.
35 views

### Insertion Loss & Return Loss - GSML2 Link

I have a GSML2 Link specification connecting Serializer and Deserializer via coax. While performing the SI analysis, I had a few doubts. In the deserializer datasheet, we have forward channel of ...
44 views

### Pulsed power calculation

I want to calculate power loss across a resistive load during a 1 ms interval. The experimental setup is such that the voltage and current through the load varies the whole period of 1 ms. I have 10,...
2k views

### Why do we use low resistance cables to minimize power losses?

Generally, one would like to minimize power losses via Joule heat. Intuitively, using low resistance cables (for example by using materials with low resistivity like copper) should do a better job ...
108 views

### What causes power losses in transmission lines?

From my understanding there are two causes for power losses in transmission lines: Losses due to resistance: $R = \frac{\rho l}{A}$, where $\rho$ is the resistivity, $A=\pi r^2$ and $l$ ...
3k views

### Dual active bridge converter

I'm having issues calculating the power losses associated with the operation of a bidirectional isolated Dual Active Bridge DC/DC converter. The converter is controlled using Phase Shift Modulation (...
48 views

### HC05 Bluetooth Ping without losing connection

I am currently working with the Bluetooth module HC05 using a Teensy 3.2 board. I successfully established a connection between the laptop and the board using Bluetooth. I can send data from the board ...
99 views

### Can't achieve the goals in designing and simulating Resonator circuit

Goals I need to design resonant parallel circuit and simulate it with LTSpice so that it match with the design requirements correctly. Requirements Source Impedance $R_s = 100\ \Omega$ Load ...
48 views

### Dielectric Loss for Constant Impedance

Are dielectric losses the same for two different 50ohm structures that are built in the same dielectric medium? Eg. Two 50ohm Stripline traces in FR4 where one is very skinny with close GND planes, ...
182 views

### Calculation of transmission loss of a power plant

What is the transmission loss due to heat if my power station produces electricity at a power of $5 kW$ and the electricity consumer is $1 km$ away? It is a copper line with a material constant ...
49 views

### Ohmic power loss due to electric field

Recently I read in the basic EM theory course , that the Ohmic power dissipated in a conductor is directly proportional to the conductivity and the square of the electric field intensity , but we know ...
74 views

### Can digital clocks and other electronic devices “ride through” a momentary power interruption?

I recently attended an electric utility training course discussing relay protection practices. One topic that came up was a fuse saving scheme where a protective reclosing device would momentarily ...
50 views

### Non-uniform temperatue distribution

Please assume a semiconductor chip like IGBT or MOSFET heated by a specific power loss. It is found that the more the power loss is, the more severe the chip's temperature distribution non-uniformity ...
144 views

### Loss due to impedance matching in a filter

I have a quite basic question, after starting to re-read some RF theory. If a voltage source has a resistance of 50 ohms, and the equivalent impedance of a connected bandpass filter and its load are ...
4k views

### Determining how much current I can actually run through my Cat6 24AWG Cables in my confirguration?

I want to use a CAT6 (24AWG) RJ45 cable to carry a total of 2A at 48V. As per the AWG Chart, I see that the Maximum amps for power transmission is 0.577A but the <...
4k views

### Calculating copper losses of transformer given iron loss and maximum efficiency

I wonder if anyone can help me understand copper losses in transformers a bit better. I'm having problems understanding the highlighted part on the attached picture half way down the page. I sure its ...
174 views

### Ground losses in mains delivery network

It is my understanding that the mains distribution system (poles along the road, where I live) has occasional earth ground connections of the Neutral wire. Maybe every pole, or just every few poles, ...
103 views

### Link budget - Path-Loss in a Wlan Network

I am struggeling with the dB calculation on an wlan-network. An antenna has dBi but the pathloss in the air is dB with the formula 100 + 20 * log(km). Can I just mix dB, dBi and dBm? Here is a sample ...
1k views

### The effect of rust on a transformer core

I want to make a transformer with a core of laminated electrical steel sheets. I have some EI core sheets, 0.5mm thick. My design is for a gapped core transformer, and the shape of the gap is unusual, ...
987 views

### Compensating for power loss through resistor in high/low pass filter circuit?

Circuit design of a Low-pass filter borrowed from Wikipedia Article on the subject: Circuit design of a High-pass filter borrowed from Wikipedia Article on the subject: I'm thinking of implementing ...
73 views

### Which of the two connections is best for reducing losses?

I have a choice between the following two set-ups for a project. Option One is to have the motor controller mounted close to the batteries but further away from the motor. Option Two is to have the ...
160 views

### Power losses in long wires with multiple loads

I need to calculate power losses in long wires. I managed this for the case of constant currents. But in the real world, my loads are DC-DC regulators. The load draws 11W of power, network voltage is ...
38 views

### Maximum tolerance for a loop trace-antenna's capacitor

While going through the document at https://www.silabs.com/documents/public/application-notes/AN639.pdf I have read from "Figure 13. Loop Antenna Simulated Mag(Zin) vs. CP1" below that even a 2% ...
1k views

### Friction Coefficient of AC motor [closed]

Does the Friction Coefficient "B" of AC Motor changes with the change of a load connected to an AC motor? OR it is always constant?
99 views

### Effective or minimal area of core to calculate losses?

I've got a problem regarding the information given in coil's datasheet (PQ35/35: http://www.ferroxcube.com/FerroxcubeCorporateReception/datasheet/pq3535.pdf). There are two different areas given: ...
72 views

### Is it important to consider channel bandwidth of the signal to measure cable path loss for RF testing?

I am performing some RF tests for 802.11 and measuring path loss of the RF test setup, it has a mix of PSK & OFDM signals. I see the norm is to use a Continuous Wave signal to perform RF path loss,...
375 views

### Capacitor loss in high frequency DC-DC converter

I have designed a boost converter: Vin = 60 V Vout = 150 V Switching frequecny: 340 kHz or maybe higher Filter capacitor: 1uF The picture is only a basic structure of boost converter, and what I ...
323 views

### Power losses of a switch

A power transistor is used to switch a 25 A, 600 V inductive load at a switching frequency of 100kHz with D=0.5. Turn-on and turn-off each occur in 100ns and the collector on-state voltage is clamped ...
321 views

### Why return loss gets ripples?

I tested an amplifier on a circuit board with a network analyzer. It was tested under input power of -20dBm, which is well within the linear region.The amplifier uses SMA connectors. The simulated ...
1k views

### Flyback converter losses

i have been designing flyback converter of a 5Volt 5 ampere specifications output deriving from 220v ac mains. But i have been stuck at one point and can't seem to get out it. Efficiency is ...
517 views

### Methods for measuring cable path loss in RF Testing

I have been reading about various methods to perform a Cable Path Loss for RF Testing but not being a core RF person, I needed some insights on how it is done in Field or Lab. Here is my understanding ...
2k views

### Flyback Transformer core heating up

I am designing a Discontinous conduction mode flyback converter, 100kHz using UC3844 IC with the spec. 220V,50Hz to 5V 5A. The issue is that after testing it for an hour, the transformer starts ...
655 views

### Switching loss in a synchronous converter (buck, boost or buck-boost) when light load occurs

When a synchronous converter operates in high load condition,if the inductor current is always positive, the switching loss of the Synchronous mosfet is minor in comparison to the switching loss of ...
83 views

### Heat Cable: directly powered with 230V AC vs. 12V DC with step-down efficiency

Is it any less efficient to drive a 12V version of a heat cable from a step-down buck than directly powering a 230V version of it directly from the wall?
831 views

### A problem on Relay Power loss

On our quadcopter, we're carrying a switching circuit that would allow the switching between two batteries. When using the 2 Channel Relay Module, the quadcopter is having a hard time flying with it. ...
57k views

### What causes cables to get heated up and melt in a circuit? (DC Circuit)

I know lots of current can cause heat but what else? Can too much resistance in thin cables cause heat?
171 views

### Calculating power received and V (rms) given powr loss

The transmission line cable below is 10m long and has a power loss of 1 dB/m at the frequency of the source. What is the power received at the receiver (in dBm), and the voltage (RMS) of the signal at ...
239 views

### Which oscilloscopes can reliably measure losses in an inverter for an AC motor?

For my next project at my workplace I am looking for an oscilloscope which gives me good support in measuring the losses in one of the half-bridge switches over one commutation period. The last time I ...
1k views

### Safe shutdown/restart Raspberry Pi due to a power loss

I am a total beginner in electronics so I need your advice. Does this simple circuit provide for a safe shutdown, with two super caps of 10F? (Original image)
28k views

### Definition and Explanation of Insertion Loss and Return Loss

I'm trying to understand the physical meaning on Insertion Loss and Return Loss on a transformer, specifically RF transformers. The values are often quoted as figures of merit in datasheets, but I'm ...
7k views

### Insertion Loss vs Transmission Loss

Today I was told that something was causing Transmission Loss and not Insertion Loss. Can someone clarify what these two phenomena are? I always thought they were the same thing expressed in dB or dB/...