# Questions tagged [communication]

Use this tag for non-technical questions about interpersonal communication in the engineering profession.

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### Heat loss in Optical Fiber

I am conducting a thermal analysis of optical fibers. ( Software used AutoCAD Fusion 360) The Inputs conditions are : Let's assume an input power of 1250W, with an efficiency of 98%. 2% loss which ...
• 29
1 vote
35 views

### Calculate the temperature stability of wavelength demultiplexer

Hi ive been given this question: A wavelength demultiplexer (DMUX) used in a DWDM communication system has a channel spacing of 100 GHz. The operating pass band of each channel is 50 GHz. The ...
• 11
1 vote
48 views

### Can strength be expressed in a single value? Can flexibility?

I'm trying to communicate information about the strength and flexibility of certain materials to laymen. Are there any recognised proxies for strength and flexibility? I've tried: \text{Strength ...
• 11
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### Describe the magnitude of a force using real-life comparisons instead of numbers

I already asked this on physics.se, I got a suggestion to ask here, but the question became too old to migrate before I decided to do it. I did also receive an answer, and I am grateful for it but ...
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1 vote
10 views

### how to implement an encoder in matlab

How can I encode a quantized vector in matlab ? This is a part of a problem where I am asked to implement a communication block using matlab.
1 vote
34 views

### why can't remove the Image frequency using a band-pass filter?

why can't remove the Image frequency using a band-pass filter? I've been asked to search for the reason why we can't use BPF (band-pass filter) in order to remove the effects of the Image frequency? I'...
1 vote
11 views

### Can channel bandwidth can transmit any VALUES of frequencies as long as they are within range

I know that channel bandwidth is the range of frequencies it can transmit . Let's say channel bandwidth is 100 Hz . Does that mean it can transmit any signal whose bandwidth is 100Hz regardless of ...
• 11
1 vote
36 views

### What's the best way to get an ultrasonic sensor that can vary its operating frequency

Long story short I'm looking to build an ultrasonic sensor that can also be used to communicate with a seperate sensor. (So it must be able to send out a pitch around ~42kHz, but also alter the pitch ...
• 11
81 views

### How do mobile phones switch 4G/3G/2G?

I would like to know the algorithm of switching between 4g/3g/2g. When will the phone switch from 4G to 3G or from 3G to 2G, when we select for corresponding option in the mobile phone. Is it based on ...
• 21
1 vote
176 views

### Tethered Balloons vs Towers for Wireless Communication

If we use tethered balloons (aerostats) with wireless gateways fitted on them (let's say for Cellular or LPWAN communication), they can provide much more coverage owing to the height they can reach (e....
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1k views

### How to integrate 7 segment display with ULN2003? [closed]

I am working on a project. A water level indicator using ULN2003. Now I want to integrate a 7 segment display to indicate the water level. How?
• 41
1 vote
3k views

### Matlab code for a visible light communication system

I simulated a VLC system for an AWGN channel and plotted the BER against Ebno. I used the LED impulse response and convolved it with the signal produced to transmitting. But the results are not OK. It ...
118 views

### How can I make a GPS traceable microchip? [closed]

I am looking for making a chip or a microchip, which can be traced with the help of the satellites. Means it is merely a chip and when I tune my satellite to a particular frequency I would get to know ...
• 113
1 vote
179 views

### AT Commands for FTP Server Connection on SIM Modem

I am trying to connect to a FTP server on a raspberry pi and transfer a file onto the server. I am using the SIM5320A chip on a breakout module and I am having trouble getting the module to connect to ...
1 vote
65 views

### Is there a universally accepted way to refer to choosing a more powerful motor for an application?

One antonym word I can think of is "derating". If I say "derate motor for pump X", it can mean "select a motor with lower power output, since the pump doesn't need a more powerful motor". But what ...
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