Questions about cable types, properties, ratings and construction.

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3
votes
2answers
76 views

Headphone cable as antenna

How can headphone cables act as Antennas for built-in radios in smartphones ? Is it possible because of different frequency channels or what is the theory/mathematics behind this? On a side note, ...
4
votes
2answers
179 views

Serial cable won't physically connect?

I have an Altera DE2-115 with an RS232 port. I also have a USB-to-RS232 cable with the connector like this. One is male and the other is female, so they should fit just fine. However, I cannot get ...
-1
votes
0answers
17 views

eSATA and SATA III [migrated]

I currently have a SATA to eSATA adapter on a system with SATA II, but I'm going to be upgrading to a system with SATA III ports on the motherboard. What I'm wondering is, if I connect the same ...
0
votes
3answers
84 views

Maximum current for a single-core cable?

I want to connect the cables of a LiPo 7.4 V 2200 mAh battery, to a breadboard. However, the only way to make this happens is to solder the ends of the battery cables with a single-core cable with ...
0
votes
1answer
112 views

220V AC power cable max current

I installed 1mm2 copper AC power cable across house for video surveillance (8 cameras, Power Consumption for each camera is Max 4W, 12V). For each camera has its own 220V->12V converter rated 3A. ...
0
votes
1answer
57 views

Length restrictions on USB 3 cables with USB 2 powered devices

I have this very specific situation where I want to get an understanding of the cable lengths in a USB cable setup. I have 3 USB 2.0 devices that require bus power. So I've connected these 3 with a ...
0
votes
2answers
126 views

Why is propagation delay of ethernet cables unaffected by cable length?

I did some searching on how propagation delay in ethernet cables is affected by the cable length. The answer seems to be that the delay is negligible until the cable length reaches a kind of threshold ...
1
vote
1answer
51 views

Combine protocols on a U/FTP Cat 6a cable (USB 2.0/I2C)

Main question Can I use a Cat 6a cable for USB communication? On the cable it says 650 MHz, is this sufficient for USB 2.0? The length of the cable would be about 6 meters (about 19 ft). If so, would ...
1
vote
2answers
90 views

Does the position of the Ferrite bead matter?

Often I will see a ferrite bead a couple of inches from one end of a cable. Does the position of a ferrite bead really matter?
2
votes
2answers
168 views

High voltage cable cross section

What kind of power and voltage can the cable in the photo possibly drive and why is it composed of a lot of small cables? What if the diameter of the single copper cables were a little bigger? How ...
0
votes
0answers
22 views

Malleability of high temperature superconductive wires

I don't know if this is the right place to ask this but it seems the most appropriate: Are superconductive wires made from high temperature superconductors (BSCCO) malleable? I know they're made ...
2
votes
2answers
67 views

Serial comms over 3m cable, shared with USB

I am designing a system that needs to do serial comms over a standard USB cable, as well as normal USB (but not at the same time). In other words, when plugged in to a PC it will appear as a USB ...
2
votes
1answer
174 views

Problem interfacing Platform Cable USB DLC9G

I just started working with FPGAs/CPLDs. Coding and simulation went well and now I wish to program a device. So, I bought the DLC9G programmer plugged it into the USB port. I di not install any ...
0
votes
1answer
116 views

Does the “drain” wire in a microphone audio cable serve any purpose the shield does not?

I'm helping a friend with an audio installation, and he asked about the requirements for the microphone cable: "Wiring Requirements: 2 Conductor shielded cable, 22 gauge with a 24 gauge drain ...
6
votes
7answers
1k views

Sending I2C reliabily over Cat5 cables

I am considering implmenting an home automation system around my Raspberry Pi but I found the price and space requirement of inserting a Pi every place some control is required too much but the Cat5e ...
36
votes
7answers
6k views

Why aren't headphone jack shaped plugs used for data?

With Apple's lightning cable, and USB 3.0, reversible cables are taking off, and I personally think this is very convenient. But we have had better than reversible for a long time, in the form of the ...
3
votes
0answers
65 views

Modifying headset's microphone to hear from it? [closed]

Problem? I have a headset with a microphone, like this: Good for you. What do you want? I want to use my headset's microphone as a real microphone. It's already a real microphone, you noob. ...
1
vote
2answers
217 views

Why do laptops' chargers have coaxial cords?

The cord connecting my laptop to the charger is a coaxial cord. It seems to me that other laptops also have the same type of cord. I get that coaxial cords are good for connecting my TV to an ...
1
vote
1answer
100 views

Breadboard Wiring with Seven Segment Display

So I'm planning on building a skee ball machine and as I've been looking into it I've decided to use some seven segment displays from here: As I've looked into this more I know I need a breadboard ...
0
votes
1answer
91 views

How long does it take to receive data from a cable, turn it into bits, then send it back out again? [closed]

I need to read in data off of a fiber optic (or copper, though I figured fiber optic would be faster) cable, convert it to bits, do something with it that should only take a clock cycle or two, then ...
1
vote
1answer
58 views

Can I make a 6-wire cable with 36V, 5A, and USB? [closed]

I'm trying to build a cable for some arcade light guns. The gun has a USB cable, and another 36V, 5A (peak) cable. Can I find a 6-wire cable that can contain both the 4-wires for the USB and the ...
0
votes
1answer
58 views

Modify a kinect - Reconnect the two cards

I’m trying to make a Kinect camera smaller. There was a problem at some point and my client expect me to put the kinect in a vertical position rather than horizontal as it is supposed to be. The ...
-1
votes
1answer
47 views

RCA and S-video Splitter [closed]

I would like to split yellow RCA cable (because I need 2 input cables for 2 tvs/monitors). And do the same for S-video cable. Can I use cheap simple "splitting" cables with one input and two outputs ...
1
vote
0answers
80 views

Shielded cable vs. unshielded in underwater environment

I know basic electromagnetic theory very well and understand why this works but I'm not sure about one thing regarding usage of coaxial (shielded) cable vs. unshielded (normal conductor) cable when ...
0
votes
2answers
80 views

Not recognizing the port [closed]

So I have a gizDuino ATMEGA 644(an arduino clone), yesterday it is working very well and even uploaded some codes into it. But today my computer suddenly don't recognize the port where my ...
5
votes
1answer
99 views

Industry standard measure for coaxial cable stiffness?

Is there an industry standard measure for coaxial cable stiffness? By stiffness I mean the spring force experienced when bending or deforming the cable. In my search for a highly flexible lab test ...
0
votes
1answer
65 views

STM8L discovery board, wires for the breadboard

I don't know if it is the right place to ask, but still I have a STM8L discovery dev board - http://www.st.com/web/catalog/tools/FM116/SC959/SS1673/PF250636 which has very small square male-type ...
0
votes
2answers
85 views

Identification of Power Cable Type [closed]

I've searched and can't seem to figure out what power cord I need to get for this device. On the back it says: Power: Input --> 100-240V, 50/60Hz Output --> 12V-2A 5V-3.5A Thanks in advance.
1
vote
1answer
175 views

What might cause coaxial cable noise?

In my A level physics I recently did an experiment to find what the optimum frequency to send a digital signal through a RG58/U Coaxial Cable is. My results are available on Dropbox. What I found was ...
1
vote
2answers
93 views

Crimp connectors making process review

I'm actually working on a project with several "little" modules. They are all connected to the PSU and the MCU. So I've design interface for each, so I can easily wire everything together. For that ...
0
votes
1answer
142 views

Star quad cable: Why does the white wire have noticeably less resistance?

I ordered the star quad Canare microphone cable, but I do have a question: why is the resistance of the white wire noticeably less than the resistance of the blue and shield? (The blue and shield are ...
3
votes
2answers
238 views

Why DisplayPort cables must isolate the power pin?

I've been investigating why my 2560×1440 DisplayPort monitor and my mini-DisplayPort MacBook Air don't play along, and, it turns out, this is likely due to a wire in the cable that connects the two ...
1
vote
2answers
87 views

Wire-tie cables

Is there a name / specific type for flat-jacketed wires which come tied on consumer product cables (eg. earphone cables, power cables) ? I always collect them from the new products I buy, but I wish ...
2
votes
4answers
224 views

Programming and controlling microcontrollers and FPGA using Laptop (USB port)

Formerly laptops had serial and parallel port and it was really easy to connect laptop to micro-controllers and FPGAs. But USB has its own protocol and its not as easy as parallel port to implement ...
9
votes
4answers
435 views

How is xΩ impedance cable defined?

This is probably a really simple question, but I can't seem to find a definite answer anywhere. I'm guessing 50Ω cable means 50Ω per unit length. What unit length is this? If this is not how its ...
2
votes
2answers
249 views

Arduino Uno and Sonar Sensor - how long can the wire be before performance suffers?

I am setting up an Arduino Uno with a sonar sensor from Maxbotix (http://www.maxbotix.com/Ultrasonic_Sensors/MB7360.htm). The sensor will be powered directly from the Arduino (5V). The sensor needs ...
1
vote
1answer
156 views

Is an RJ45 / 8P8C connector a good way of connecting an Arduino to a simple device / circuit?

I'm creating a two-part, bass guitar-style MIDI controller, where the left hand plays a small fretboard which detects which frets are being played, and the right hand "plucks" strings (actually senses ...
1
vote
2answers
144 views

How do coaxial cables carry information that a TV can intercept and display?

Is there a specification for this? Like, say, at the backside of a cable box there exists a singular coaxial cable that is meant to be plugged directly in the back of the TV. The TV must be set to a ...
13
votes
2answers
321 views

Terminating shielded/screened twisted pair correctly

Theoretically, I can't see a problem if the twisted pair has an end of cable termination that is: - A single resistor (R) that matches the characteristic impedance of the cable placed across the two ...
9
votes
6answers
1k views

Apple power supply: thick AC cable, thin DC cable - why?

Apple power supply consists of a very thick, inflexible AC cable (wall outlet to converter) and a very thin, flexible DC cable (converter to computer): Why? The currents through the cables should ...
3
votes
2answers
269 views

Why would high-voltage cables have semiconductive layers in their design?

Turns out a high voltage cable can have semiconductive layers in its design. For example here's a rather old patent covering some specific way of producing such cable. This doesn't make much sense. ...
1
vote
2answers
96 views

What kind of cable can be used to power a mobile electric machine running of 6 kV AC?

I'm looking into the specifications of Hitachi hydraulic excavator model EX8000E-6 with electric motor. The spec says the motors are of type HITACHI TFOA-KK and run off AC 6 000 - 6 600 V / 50 Hz, ...
0
votes
1answer
122 views

Can someone identify these cable connectors?

The cable that i have attached in the pictures below need to be replaced. I don't know the names(types) of the two connectors so i need your help. The device i need to connect:
1
vote
1answer
124 views

Where can I buy a thin metal cable?

I need conect two small printed circuit board. I can use any metal cable (what is the correct name for it?) so I buy this. It use the number "NU 30" but I don't find this number in other place and it ...
0
votes
1answer
131 views

cable losses per meter (voltage > 400 and frequencies [50 Hz … 60 Hz])

If I compute I * I * R I obtain the loss of the conductor in Watt. Is this per meter similar to the dielectric loss (see IEC 60287-1-1)? I am also wondering about the loss factor of sheath and ...
29
votes
7answers
1k views

Why were coax cables used for networking?

Often, if older standards become obsolete, it's because they are superseded by newer technologies. In the past networking was done using coax, instead of the twisted pair used today. Why did they use ...
2
votes
2answers
217 views

Why a wave does not enter a cable? Understanding TDR (Time Domain Reflectometry)

I have been doing some TDR (Time Domain Reflectometry) measures which involves sending gaussian pulses through a cable and measuring the s11 (reflection) parameter. In this measure, I could see that ...
1
vote
1answer
123 views

Reflection coefficient VS frequency

I was trying to look for the answer of what I think it should be quite a simple question but I haven't found any nice answer (at least any that has convinced me). Here it is: Through a cable ...
0
votes
2answers
138 views

TV and PC power cords [closed]

I have a Samsung PS43E450 TV (pic here). I lost the power cord. Can I just use the power cable from my PC (since it fits in the slot), or will it blow up?
8
votes
2answers
672 views

What does the “RG” in coax cables mean?

For instance RG-6, RG-58, RG-59 and RG-173? Also do the numbers have a specific meaning (like referring to a part of the specification)? Is there a document that lists all RG-* cables with their ...