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Questions tagged [attenuation]

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4
votes
1answer
782 views

Convert 'dB per 100m' to 'dB per 1m'

I want to know about wire loss per meter. However, in the datasheet, it is written that 6.1 dB is attenuated per 100 meter, so I wonder if it is possible to simply calculate 0.061 dB if I want to ...
0
votes
1answer
114 views

Why does a soldered IPEX MHF4 (WIFI card) connection result in signal attenuation?

In my laptop, the WIFI card was connected to the 2 antennas by IPEX MHF4 connections, which look like tiny coax connectors. Unfortunately the antenna connectors got broken, so I have removed them and ...
1
vote
1answer
94 views

Instrumentation amplifier output attenuation in LTSpice

My task was to design an instrumentation amplifier with given specifications and simulate it on LTSpiceXVII. We were told to only use one type of ac source, so to get the inverted signal I used a ...
0
votes
1answer
112 views

Resistor circuit to correct impedance matching and attenuate signal by 10 decibels

I've got a Line Out on my amplifier with 100-600 ohm impedance (avg. 350). I have it connected to an effects pedal that has a 1M ohm input. Right now the signal is clipping from the amplifier and I ...
0
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0answers
62 views

What's the noise figure of an attenuator not at room temperature?

I'm confused by the following: What's the noise figure of an attenuator with 10 dB loss at very high temperature, having a noise power of like 80 dBm/Hz? How about if the attenuator at very low ...
0
votes
1answer
60 views

Effect of a capacitive or inductive divider on noise

I am used to thinking about the effect of an attenuator on a system's noise in the following way: there is some system noise (and signal) at the attenuator's input, coming from the preceding part of ...
0
votes
0answers
38 views

how to apply frequency-dependent attenuation to a signal

Let's suppose a signal like this: the frequency domain plot of such a signal is: Now, What I intend to do is to apply a frequency-dependent correction to the signal. For example, the attenuation ...
1
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3answers
57 views

Calculate the frequency corresponding to a given current or power attenuation in an LRC circuit

For a series LRC circuit, I'm trying to calculate the frequency corresponding to a given current (or power) attenuation to either side of the resonance frequency peak according to the formula for ...
0
votes
1answer
78 views

Getting 4G/LTE signal through sheet metal - opening/aperture size needed?

We have a storage area, that is surrounded by corrugated sheet metal. (Appears to be galvanised steel, and probably 2-3mm thick). Inside the sheet metal, we have a LTE/4G router, on the Telstra ...
1
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3answers
91 views

Input Attenuation and Intermodulation Products

I am measuring intermodulation using spectrum analyzer. How does the input attenuation affect the power of intermodulation products?
1
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1answer
54 views

Transform one voltage range to another

I have a 0-12V voltage range (Vin) that I need to transform to a 100mV-900mV voltage range (Vout). The 0-12V input is fixed from another system, and my analog circuitry needs the 100mV-900mV for ...
1
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2answers
69 views

Re: attenuating amplitude of a signal

I need to attenuate a signal which outputs from a function generator. The minimum amplitude of the signal from the function generator is 1mV. What would be the best method to attenuate the signal from ...
1
vote
1answer
67 views

Butterworth and Chebyshev filter problem

Find the minimum order Butterworth lowpass filter whose attenuation isn't bigger than 2 dB at 5 rad/s and has 10 dB at 8 rad/s, 20 dB at 10 rad/s, and 40dB at 30 rad/s, then do it for Chebyshev filter....
1
vote
3answers
93 views

Demodulation/filtering of a binary signal

I'm simulating an amplitude modulation system on Matlab and have got to filtering the demodulated system. The original data to be sent was a 1x100 set of binary data. Which was then applied to a ...
2
votes
2answers
77 views

Difference Amplifier - Signal Attenuation

I am planning on using a difference amplifier IC much like the AD8206 to measure the differential voltage across a high side shunt in order to monitor the current. I chose a differential amplifier ...
1
vote
1answer
109 views

Is there a way to measure or predict how much a 10.5 microns Aluminum foil attenuates EMF radiation? [closed]

Is there a way to measure or predict how much a 10.5 microns Aluminum foil attenuates EMF radiation? And at what frequencies? Is it enough to use as Faraday shield?
1
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2answers
194 views

Active filter has unintended attenuation for lower frequencies

I have design an active filter with an online tool. The circuit looks as follows: It should be a low pass filter of 3rd order with a cut-off frequency at 50kHz. Unfortunately, it attenuatues DC ...
0
votes
1answer
281 views

FR-4 RF attenuation (when used as an enclosure)

I want to use a blank PCB (no copper) as a panel of an enclosure because it seems to be the cheapest way (Seeedstudio et al.) to have custom holes and cutouts. I wonder if antennas placed behind such ...
1
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2answers
160 views

radar attenuation calculations

I would like to ask a few questions that are probably not difficult for engineers to figure out. Personally, I am not an engineer but want to learn about radars. I am having trouble understanding the ...
0
votes
1answer
191 views

How to calculate cutoff freqeuncy of Bandpass filter, given an attenuation dB level (OTHER THAN -3DB)

I know that -3dB is the accepted standard, where the power of the signal is at 50%, and that upper and lower cutoff frequencies are calculated with regards to this value, and there are simple formulas ...
0
votes
2answers
929 views

Purpose of attenuation before op-amp input

What is the purpose of putting attenuation circuit before op-amp input? I cant find the actual reason for this topology. Is there any reason behind it? Why we need to attenuate the incoming signal but ...
1
vote
0answers
37 views

Signal Attenuation TVS and series resistor

This question is in regards to signal attenuation on high speed data lines like RS-485 (and any others as well). I'm new to the signal world, so please bear with me here. Are there some useful ...
1
vote
2answers
86 views

Effect of wall location for guided wave attenuation

Pardon my ignorance here if this has already been answered. I'm not fully familiar with the English terminology here so my searches came up empty. If there is any keyword I’m missing or I’m not using ...
0
votes
1answer
73 views

LTSpice transient analysis and current amplification problem

Im simulating LC circuit in LTSpice: It's tuned at resonance at 1 MHz in the transient response simulation plotting the source and R1 current. Both of which are equal in amplitude 600mA but with a ...
0
votes
1answer
90 views

How to interpret the vertical axis of this attenuation plot?

How can I interpret the following curve for this toroidal ferrite? It shows the attenuation vs frequency. But the vertical axis is not dB, it is impedance in Ohm. This is unusual for me. How can I ...
4
votes
5answers
2k views

Running baseband analog audio signal over cat 5 cable [closed]

What will happen to a single ended (not differential) 1Vpp analog audio signal(4khz bandwidth, not modulated) if it runs through long cat5 cable (length can be 50 meters)? How much signal voltage can ...
0
votes
1answer
50 views

Difference two attenuation constant

When finding parameters for electromagnetic waves and transmission lines, we can find various characteristics including attenuation and characteristic impedance. \$\alpha\$ is attenuation constant. 1-...
0
votes
1answer
243 views

Best way to attenuate R2R DAC output?

Given an N-bit R2R DAC, with input voltages of e.g. 0-3.3 volts, what is the the best way (signal integrity and quality maintained) to attenuate its output voltage to a range e.g. 0-.7 volts for a VGA ...
1
vote
1answer
127 views

What is rapid signal attenuation?

Attenuation describes the weakening of the signal as it travels from the transmitter to the receiver. However, this textbook describes a concept called "rapid signal attenuation" as a way to allow ...
7
votes
1answer
1k views

Why is an oscilloscope's Attenuation switch placed on the probe?

I'm wondering why an oscilloscope's Attenuation switch is placed on the probe not on the oscilloscope's body (like the AC/DC Coupling switch that's placed on the scope body not on the probe)?