signal is a sequence of states in a communication system that encodes a message.

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4 views

SIte Survey using Netgear WG602 v4 + DD-WRT + Yagi for Wifi extension

I used Netgear WG602 v4 factory interface + Yagi to connect to my wifi (Client mode). I did that using Site Survey (client mode) button in the interface. Later I saw that there's a DD_WRT available ...
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17 views

Send an electric signal with raspberry PI

i would like to know if it's possible to Start my computer with my Rasp Zero, not with WAKEONLAN or things like that, just an electric signal as if i was pushing the power button. From a internet ...
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1answer
23 views

How to start a Google Crome app from command line?

I installed Signal Private Messenger and it's now in the list of apps at chrome://apps. How can I start the app directly app from the command line?
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1answer
57 views

How to improve wifi coverage when my router needs to be in an awkward place?

I live in a 1100 sq ft (100m²) apartment. I receive internet via an ethernet cable in a small space inside one of the bedrooms, far from the living room and the master bedroom. The router sits in that ...
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1answer
37 views

My headphones are picking up radio [closed]

I recently got a new computer and as soon as I plugged in my headphones, I heard static coming in from only one side of my headphones. I unplugged my charger but I can still hear the radio, can anyone ...
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0answers
11 views

How to duplicate a tag in Signal Data Hub

I have a couple of tags setup in Signal Data Hub and I would like to know, if it is possible to duplicate these tags. Meaning, I want to keep everything about the tags the same except how they are ...
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0answers
42 views

per-vif tx power setting?

I am trying to change the tx power setting for my TP-Link TL-WN821N adapter for learning purposes. I tried this: iw reg set BO iwconfig wlan0 txpower 30 and this ifconfig wlan0 down ...
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0answers
64 views

How to connect multiple powered speakers by using a splitter?

I have 5 self-powered speakers. I want to connect those speakers to my computer by using 3.5mm audio jack splitters. Is this possible? Does it have any effect on the audio signal or sound ...
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1answer
27 views

How do I find the SNR of an ethernet connection?

iwconfig reports the signal-to-noise ratio (SNR) of wireless connections, but how do I find the SNR for an ethernet connection? ifconfig does not report it.
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1answer
41 views

ASCII code for Win+R

Is it possible to "emulate" the keystroke Win+R (or more generally speaking: any combination with Win key) with an ASCII code? It is possible to send Ctrl+Something as an ASCII code, so I wonder ...
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76 views

No HDMI signal with i3 + Denon amp

My setup used to worked perfectly : Windows 10 + i3 4330 --HDMI--> Denon amplifier --HDMI--> Samsung TV One day, I got a power outage. But once it went back, my HTPC stopped sending signal to my ...
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2answers
26 views

How to know if I have this signals in my area?

How to know if I have this signals in my area? GSM, GPRS, EDGE, 3G, 4G, HSDPA, HSPA+ and LTE I don't have any smartphone but I have a laptop.
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1answer
104 views

Why does the monitor lose signal when I turn off/on my monitor on Windows 7?

Ever since I installed Windows 7 on my machine, my monitor has been acting strangely. When I boot my machine, my monitor starts up and receives signals fine. However, no matter what if I decide to ...
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1answer
69 views

Why screen no signal only on first boot? how to fix?

Every day is the same. I arrive to the room, I turn on the PC, screen no signal. If I shut down the PC and boot again, the signal recovers, until the next boot hours later. I've had this problem for ...
2
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0answers
224 views

Monitor displays “no signal detected” message

I recently bought a new monitor but when I connect it to my PC I only get a "no signal detected" message. The monitor works fine when I connect it to my laptop, and my PC also works otherwise. I tried ...
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2answers
186 views

How do I connect a computer far away from the monitor?

I have an architectural practise where we use relatively powerful computers that are difficult to replicate on lap tops. Flexibility in the office is key, so I was wondering if it is possible to place ...
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0answers
14 views

Intel Integrated Audio Signal Path

I have a Dell Latitude C840 laptop. It has Intel Integrated Audio. Intel 82801 CA/CAM AC'97 Audio Controller. It has been giving me problems. Sometimes I get chopped or truncated audio, or strange ...
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2answers
99 views

Can I use a router to distribute an internet connection from a laptop?

I want to take the signal from one router, using a laptop. From this laptop, send it to another router, and distribute the aforementioned signal throughout another wireless network. I even have a ...
3
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1answer
120 views

Noise coming from HDD or CPU in headphones

I hear weird high sounds coming from my headphones. It is obvious that it has something to do with HDD or CPU because it's highlight sounds are heard when I it is writing data on HDD but also many ...
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1answer
3k views

Restart process on linux by its pidn number with kill command, how?

Well, I want to be able to restart processes on linux and so I looked into kill manpages for that. Apparently kill -l would list all the signals I could send to a process to do what I need, which ...
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3answers
159 views

Why is zero treated as positive sign?

In signed int or in binary digit Zero is treated as positive sign and 1 is treated as negative sign. For example :- 1000 0000 0000 0110 = -6 0000 0000 0000 0110 = 6 But in pulse ...
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0answers
64 views

How is an HDMI signal converted into video and audio?

How does a display interpret HDMI signals and update its pixels to the right configuration? I would like to write a native C program to perform this task. I am trying to build a video streaming device ...
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0answers
188 views

Don't interrupt script in sh (“try-finally” for sh scripts)

I'm trying to make a simple script to wrap a command in such a way that it runs with a swapped screen. The main target is top but I wanted it to be a general wrapper. I got it running fine with bash ...
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2answers
90 views

WIFI connection?

I would like to ask a question about how WIFI connection works. I couldn't find an answer on the internet. If both devices are within WIFI range of each other, there, of course, would be a connection. ...
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1answer
38 views

What's the soonest I can send a signal to a background process (trap)?

I have a script from which I run a second script in a subshell. What's the soonest that can send a signal to the second script? script1: ./script2 & kill -SIGCONT $! script2: echo "~~ ENTRY" ...
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1answer
112 views

How do I pinpoint why wifi access is dropping

I am in a public building (ie. library) with wifi. I am trying to to pinpoint why a wifi signal keeps dropping...or find a why to work around it. My boss often uses the wifi and recently she has ...
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1answer
45 views

Abort Printing of Huge Amounts of Text in Terminal

This has happened to me in a variety of instances: Sometimes I accidentally copy/paste the wrong thing into vim, and then I have to wait around 10 minutes for it to print through all that text. I ...
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1answer
36 views

Can cables affect Wlan connection?

Do different cables (One coax, 5-6 power cables, one HDMI, two Ethernet CAT 5e) effect a WLAN signal? Im asking because my wlan throughput rate is jumping between a poor signal and optimum, where the ...
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1answer
66 views

SIGUSR1 is getting ignored when starting binary from system() command

I try to use SIGUSR1 with timer. It works fine when starting binary from command line. But if i start same binary from system() command from other application then SIGUSR1 is getting ignored. I don't ...
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1answer
462 views

Stopped process doesn't continue to work after sending SIGCONT

I start cat in terminal: $ cat Then in second terminal I send stop signal: $ kill -SIGSTOP $(pgrep cat) And that works - cat is stopped. Now I want to wake up this cat process by sending ...
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2answers
2k views

enable on-board graphics after separated graphics card broken

My separated graphics card broke so I want to enable on-board graphics. Problem is I can't do anything in the Bios because my monitor has no signal. What should I do?
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2answers
84 views

How to submit a external signal to my computer in a simple way?

I have an electrical wire that have two states: 1/0. `1' means there is current while `0' means there is no current. How can I put these two states into a file of my computer in a simple way? I know ...
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830 views

how to kill a tcp connection in solaris operating system?

A client program connects to my server program written in JAVA via TCP connection (ServerSocket). I want to close the TCP connection between these two programs with a Solaris command or tool for ...
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2answers
2k views

Internet and Satellite sharing same coax

I have searched for this question online and I've seen a variety of answers, most of which are non-technical and simply this is a bad idea and I would never do this without any rational to back it up. ...
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1answer
287 views

How an unprivileged user could kill a process she didn't start?

I stumbled upon something very surprising which I cannot understand on a Red Hat EL 5.6 box : the user hri (which is in the group dba) is able to kill processes owned by user oracle (which is also in ...
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1answer
870 views

wifi usb dongle tricks and upload speed

Some people use a DIY parabolic foil around a wifi dongle to get better signal from a weak public WiFi hotspot, and some people buy a wifi dongle with an antenna that looks like a long vertical stick. ...
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1answer
87 views

What is the name of things that focus wifi signal (from the receiving side)?

I remember a year ago seeing a lot of ideas on the net about how to get better wifi signal from the receiving side, that is, you place Pringles or a round metal mesh near your laptop to receive better ...
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1answer
247 views

Logging signal strength in router logs?

Is it possible to to log signal strength of devices connected to Wi-Fi access point? Actually not even just connected devices, but would it be possible to intercept all wireless traffic and record the ...
2
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3answers
837 views

Router in a box

I want to put my router in a box for security reasons (it's in a common area of the building) and I was wondering in what ways would the box's material affect the signal's strength. It'll be either ...
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1answer
641 views

GNU screen quitting — sigterm to running process

I want to quit screen session. For this, I use screen -S session_name -X quit. This works well, but not like I would. The program running in screen has a handler for SIGTERM, and I really need this ...
5
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3answers
30k views

Which Wifi Channel should I use? [closed]

Very confused. I'm using inSSiDer, WiFi Overview 360 and Wifi Analyzer apps to try to determine the best wifi channel to use. Assuming all channels are in use and there are about 20 different users ...
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1answer
2k views

Python doesn't dump core files

I have a problem where a Python process is hitting a segmentation fault but not producing a core file. The following is a toy example that does not produce a core file on the following distros: ...
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1answer
551 views

Is it possible to read signal strength of USB mouse to detect its proximity in Linux?

Similar to the idea of detecting proximity via Bluetooth signal strength, I was wondering if it is possible to read such information for USB wireless mousein a linux system.
2
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1answer
473 views

ssh: propagate signal to remote process

This is the general version of: Send SIGTERM signal to a process running inside ssh It is possible to send Ctrl-C to the remote process if the process gets a pty (-tt): # Runs for 5 seconds (sleep ...
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1answer
1k views

What are likely causes of this wifi signal noise that could be causing dropped connections?

Seeing a reverse sawtooth-shaped noise spike in OS X Wi-fi Diagnostics that is associated with wireless connection drops. My wireless router is old, so it might just be dying. It seems to be somewhat ...
4
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1answer
5k views

How can I kill a parent process only?

I have the following processes. ParentProcess -- ChildProcess -- ChildProcess -- ChildProcess How can I kill the parent process only? I want the children processes not to be killed. If I try to ...
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0answers
486 views

Router in repeater mode

We have a Buffalo AirStation WHR-HP-G300N as the main router. We also have an Asus RT-N53 router located one floor higher. I've set the Asus router to act as a repeater for the Buffalo. There is a ...
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48 views

Is it possible to make a stopped process survive a shutdown?

I know that a program can receive a STOP signal and just sit there until it receives a CONT signal. Now knowing exactly how this works, I'm curious whether whether there's any way to have a STOPped ...
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1answer
113 views

Signals: Kernel-generated only?

Can processes really "generate" signals or they just request the kernel to send the signal on their behalf? And what about hardware interrupts? Do they get translated to software interrupts? Like, ...
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1answer
1k views

Wifi signal changes over time

I have a trouble about my wireless router signal. My laptop is 25-30 feet (~8 meters) away from the router. There are two walls between them. Windows reports signal strength is two bars, and inSSIDer ...