Questions tagged [loss]
The loss tag has no usage guidance.
71
questions
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0answers
38 views
Aluminum substrate for single layer high frequency circuits
For a project I need to produce a high frequency (20 GHz) single layer PCB. Since I want to reduce losses, the choice of substrate is of course important. I wondered if for this application, because I ...
2
votes
1answer
168 views
Core loss kW/cm³: UNFAMILIAR FACTOR
Looking at a datasheet picture, I assume this is an SI system value Pcv core loss kW/m³.
I haven't found this mentioned in my studying material.
What does it mean?
Also, related question, how come in ...
0
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1answer
60 views
Length of wire to calculate its power losses
Let us say I have 12V DC battery and I am using 10m long wire to connect my load with it. Now if I want to calculate power losses in the wire then should I use wire length as 10m or 20m (since there ...
0
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3answers
62 views
Which cable connection will result in a greater loss of power?
I know that running a power cable (the cable is carrying 5V DC, I plug in an AC to DC converter to the mains) that is, for example, 50m will cause losses in the power output. So if you measure at the ...
0
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1answer
40 views
How to avoid RF signal loss in a conductive cage acting like a Faraday shield?
I have a standard chip antenna mounted on a large ground PCB plane.
The product is unfortunately encapsulated inside a relatively open (carbon-fiber) conductive cage.
Unfortunately, I see an obvious ...
3
votes
0answers
32 views
Can I calculate minimum rise time of a transmission line if I know the length and the loss tangent?
Overview: I am trying to work out if it's possible to transmit my 1.2Gbps MIPI data down a 600mm long flexible PCB strip. Assuming I have the impedance correct, will the signal still be degraded by ...
0
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1answer
25 views
High voltage DC point to point transfer
I have a contemplated DC electricity system that has a battery room at a distance from the use. The battery room would be about 150 feet away from where the power is used (for lighting, computer ...
0
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2answers
88 views
Where am I wrong about my calculation of power loss?
The power loss of circuit is \$16kW\$ when the power factor, PF, is 0.6 lag. Now if I improve the PF from \$0.6\$ lag to \$0.8\$ lag, what is the power loss now?
The solution provide me the formula ...
4
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3answers
627 views
Why will the line loss decrease when the power factor increase?
QA:
If the line loss is \$50\ kW\$ when P.F. is \$0.8\$, now if P.F. become \$0.95\$, what is the value of line loss?
Solution:
\$\frac{P_{L2}}{P_{L1}}=\frac{(cos\theta_1)^2}{(cos\theta_2)^2}=\...
2
votes
2answers
51 views
Why should we multiply Copper loss with \$ (\frac{1}{2})^2 \$, not \$(\frac{1}{2})\$ when the transformer is in half loading?
A 10 kVA transformer, its iron loss is 120 W, the copper loss is 240 W (full loading), now when the load factor is 0.9 delay, what is the efficiency when the transformer is in half loading?
The ...
0
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3answers
150 views
Initial current value in capacitor charging circuit
From this video lecture how come the initial current values are different in two cases?
I think they're assuming that the switch resistance is small in the first case.
However how about if they're ...
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0answers
36 views
What is the intuition behind the pdf's in the Swerling models I and III?
I am looking at radar systems. In this context I have found that the detection probability is closely related to the SNR and that the fluctuation loss of an objects RCS is modeled by Swerling models.
...
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0answers
73 views
Magnetic loss of steel
The software called gprMax which simulates EM waves in varying environments. I am trying to enter steel has material but from the picture, it also requires the magnetic loss(ohm/meter). But I have ...
2
votes
0answers
39 views
What is the “short-range outdoor model (ITU-1411) with a distance-dependent path-loss” mentioned in this paper?
I am reading the paper Graph Embedding Based Wireless Link Scheduling with Few Training Samples, and trying to reproduce some of its results. This paper aims to solve the wireless link scheduling ...
0
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0answers
45 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 ...
0
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0answers
42 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 ...
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0answers
56 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 ...
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0answers
27 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.
1
vote
1answer
49 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 ...
0
votes
1answer
57 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,...
3
votes
7answers
3k 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 ...
1
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2answers
267 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 \$ ...
0
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2answers
323 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 ...
0
votes
1answer
65 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 ...
2
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2answers
107 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 ...
1
vote
1answer
52 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, ...
2
votes
1answer
307 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 ...
0
votes
1answer
71 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 ...
2
votes
2answers
80 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 ...
0
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0answers
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 ...
0
votes
2answers
153 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 ...
2
votes
2answers
9k 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 <...
0
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2answers
263 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, ...
0
votes
3answers
106 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 ...
1
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1answer
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, ...
0
votes
2answers
179 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 ...
0
votes
1answer
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% ...
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1answer
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?
0
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1answer
107 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: ...
0
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1answer
73 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,...
0
votes
1answer
201 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 ...
-1
votes
1answer
207 views
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/...
-2
votes
1answer
437 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 ...
2
votes
1answer
425 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 ...
1
vote
1answer
417 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 ...
1
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1answer
603 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 ...
1
vote
1answer
1k 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 ...
1
vote
1answer
151 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?
4
votes
1answer
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 ...
0
votes
1answer
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 ...
