Running ethernet over Van Damme 268-307 6 x 75 ohm cable

Started by Peter in sci.electronics.design2 years ago 14 replies

Hello All, For complicated reasons I have this cable in place. It was installed 20 years ago and is inaccessible except at the ends. Total...

Hello All, For complicated reasons I have this cable in place. It was installed 20 years ago and is inaccessible except at the ends. Total length is about 20m. I have not found data on it but there is a 268-307-20 which is a single core 75 ohm coax and this one seems to have six of these, plus what looks like smaller (audio type) coaxes. It looks like a professional video cable. I ...


EMC - RF IMMUNITY

Started by Anonymous in sci.electronics.design4 years ago 5 replies

Hello everyone. 1.) I have an electronics board that has 10 wires coming out that gets connected to an end users board with an Ethernet type...

Hello everyone. 1.) I have an electronics board that has 10 wires coming out that gets connected to an end users board with an Ethernet type cable. During our Electromagnetic Compatibility (EMC) Testing for the RF Immunity Testing there is a disturbance of our system around 100-120 MHz and 1 GHz –2.7 GHz. (Some of the values returned from the Analog to Digital converter o


OT: DOS-based test software

Started by Robert Baer in sci.electronics.design8 years ago 23 replies

I need a program that will determine a computer's hardware: total RAM, [if running inside a given OS for it to report how much is eaten by...

I need a program that will determine a computer's hardware: total RAM, [if running inside a given OS for it to report how much is eaten by the OS, how much physical space unused,total virtual and how much unused]; hard drives (make/model, size, free space); floppy drive capability, serial ports,parallel ports,USB and specs (1/2/3), Ethernet card etc..


Tabor WW1071 AWG trouble

Started by Jeroen Belleman in sci.electronics.design2 years ago 6 replies

I've been trying to load waveforms into a Tabor WW1071 signal generator, without success. I can talk to the thing over ethernet, sending SCPI...

I've been trying to load waveforms into a Tabor WW1071 signal generator, without success. I can talk to the thing over ethernet, sending SCPI commands and reading back the (few) responses. I have no problem to make it put out the standard built-in waveforms, but when I try to load my own waveforms, I get nowhere. Often I even crash the thing, requiring a power cycle before it will accept a ...


New Raspberry Pi 4 presented today

Started by Jan Panteltje in sci.electronics.design2 years ago 45 replies

New Raspberry Pi 4 quadcore presented today: https://www.raspberrypi.org/products/raspberry-pi-4-model-b/ USB3, gigabit ethernet, micro HDMI...

New Raspberry Pi 4 quadcore presented today: https://www.raspberrypi.org/products/raspberry-pi-4-model-b/ USB3, gigabit ethernet, micro HDMI dual display 4K, WiFi, bluetooth H264 and H265 hardware decode, 40 pin GPIO, 1, 2, or 4 GB RAM,. 5V 3 A supply. Only minus I see is that the power consumption goes up and up with each model, my old 1 core raspi only needs 300 mA :-(


Thick/fat/adapter/cylinder like section on HDMI cable ? What is it ? What does it do ?

Started by Anonymous in sci.electronics.design3 years ago 33 replies

Hello, The "high speed hdmi with ethernet cable" I bought looks something like this: https://www.cmple.com/learn/hdmi-cables-28awg What I...

Hello, The "high speed hdmi with ethernet cable" I bought looks something like this: https://www.cmple.com/learn/hdmi-cables-28awg What I want to know is what are these very thick sections on this cable ? Looks like some kind of adapter/device is on this cable ? What is it ? What is it named ? What does it do ? (They look like two big fat round cylinders ?!?) Bye, Skybuck. ...


Weird/smelly problem with Skybuck's DreamPC2006 and CPU fan not spinning

Started by skybuck2000 in sci.electronics.design1 month ago 30 replies

I did the following: 1. Replaced winfast motherboard with backup winfast motherboard. The backup motherboard is same model yet strangely...

I did the following: 1. Replaced winfast motherboard with backup winfast motherboard. The backup motherboard is same model yet strangely enough missing one ethernet port, it only has one, while the other has two, also firewire pins missing but ok. 2. Put some new artic silver 5 on the cpu. 3. Struggled to get the scythe ninja heatsink on it, pulled it off then put it back on ? I know thi...


Gigabit PoE - component solutions?

Started by Clifford Heath in sci.electronics.design2 years ago 2 replies

I need a inexpensive (i.e. not packaged) solution to delivering clean Power over Ethernet at gigabit rates. Yes, I know that balun imbalance...

I need a inexpensive (i.e. not packaged) solution to delivering clean Power over Ethernet at gigabit rates. Yes, I know that balun imbalance will limit how clean it can be - but I'd still rather not bring unnecessary noise into the remote (box (a radio). I don't want to buy a commercial packaged solution for injecting power, because most don't care at all about noise (I've measured *vol...


pcb signal integrity check

Started by Anonymous in sci.electronics.design2 years ago

This is the control board of my alternator simulator. I think we are getting close to receiving a purchase...

This is the control board of my alternator simulator. I think we are getting close to receiving a purchase order! https://www.dropbox.com/s/wvyxwlwzou3thh9/T901_22.JPG?raw=1 It has high power, relay drivers, uP, FPGA, dram, ethernet, USB. It goes close to the front panel in this: https://www.dropbox.com/s/71whot11i312y63/P900_3d_3.jpg?raw=1 My homework assignment is to do the s...


Ethernet RJ45 jack - what do the transformer centre taps do?

Started by Peter in sci.electronics.design2 years ago 6 replies

This is a common type of jack with integrated magnetics http://www.kosmodrom.com.ua/pdf/HR911105A.pdf It connects the txf centre taps via...

This is a common type of jack with integrated magnetics http://www.kosmodrom.com.ua/pdf/HR911105A.pdf It connects the txf centre taps via 75R resistors to a 1000pf cap which then (pin 8) goes to the circuit ground. What does this do? There are versions of the 10/100 jack which don't use the centre taps at all e.g. http://peter-ftp.co.uk/screenshots/20191119201261014.jpg


equalizing CAT6A twisted pair

Started by John Larkin in sci.electronics.design10 years ago 37 replies

We've been experimenting with pushing differential drive logic signals over CAT6A ethernet-type cable. We'd like to move packets of data...

We've been experimenting with pushing differential drive logic signals over CAT6A ethernet-type cable. We'd like to move packets of data in the form of a burst clock on one pair and data on two other pairs. Speeds range from 100 MHz clock (200 Mbps) at 20 meters to 10 MHz at around 80 meters. The eye diagrams are marginal as-is, but it looks like some fairly simple transmit-end pre-emphasis...


Dr Howard Johnson, this weeks guest on The Amp Hour

Started by David L. Jones in sci.electronics.design10 years ago 77 replies

Just thought some might be interested in hearing our recent guest on our Amp Hour radio show, Dr Howard Johnson of "Handbook of Black Magic"...

Just thought some might be interested in hearing our recent guest on our Amp Hour radio show, Dr Howard Johnson of "Handbook of Black Magic" fame: http://www.theamphour.com/2012/01/10/the-amp-hour-77-winsome-waveform-wizardry/ Lots of history of the book, signal integrity, Gigabit Ethernet development, 90 degree PCB bends, audiophoolery, and a whole bunch of other talk over almost 1 1/12 h...


Laptop Dell Inspiron Mini 1018

Started by sara bareilles in sci.electronics.design10 years ago 1 reply

Laptop Dell Inspiron Mini 1018 Mini 10 makes it easy to stay connected with world almost anywhere you go with selected systems having Ethernet,...

Laptop Dell Inspiron Mini 1018 Mini 10 makes it easy to stay connected with world almost anywhere you go with selected systems having Ethernet, and / or Bluetooth=AE connections. With selected systems, travel far and ... http://www.info-world-mania.com/


Good PRECISION low frequency data acquistion ADC -> Ethernet or USB

Started by Spehro Pefhany in sci.electronics.design7 years ago 16 replies

Hi, all:- Any suggestions for a really good low frequency (up to a few hundred Hz would be great) 24+ bit ADC box with very low low frequency...

Hi, all:- Any suggestions for a really good low frequency (up to a few hundred Hz would be great) 24+ bit ADC box with very low low frequency noise and drift? Preferably something like 20-30ppb RMS noise from 10uHz to 1Hz, with at least two-four channels input (that's roughly a true 20 bits at 1kHz). The usual NI boards and their clones have really high low frequency noise and others...


Film the inside of your cable modems ! (Reveal if fans are inside or not)

Started by Skybuck Flying in sci.electronics.design7 years ago 14 replies

Hello, Some of todays or future cable modems seem to contain a processor with a heatsink and a fan on top of it. Apperently gigabit...

Hello, Some of todays or future cable modems seem to contain a processor with a heatsink and a fan on top of it. Apperently gigabit ethernet speeds/wireless speeds might require either a processor with a fan on it, or multiple processors without fans. I certainly do not want another device in my house with another fan in it. I would like to own a cable modem in the future which is ...


I2C cable

Started by Winfield Hill in sci.electronics.design3 years ago 46 replies

We need a 1-meter length of 100kHz (or slower) I2C onnection. It'd be nice to use a pre-made cable: micro-USB, 4-wire RJ11, or RJ45...

We need a 1-meter length of 100kHz (or slower) I2C onnection. It'd be nice to use a pre-made cable: micro-USB, 4-wire RJ11, or RJ45 ethernet. Some considerations: SCL and SDA crosstalk(?), high ground capacitance. Also need 3.3V, Gnd. Micro-USB: SCL and SDA twisted together, bad? RJ11: flat, SCL and SDA on outside lines? RJ45: SCL and SDA shielded from each other. -- Thanks, ...


Split Pair Detection

Started by Tom Del Rosso in sci.electronics.design3 years ago 3 replies

Crosstalk could be time domain or frequency domain, but how could TDR detect split...

Crosstalk could be time domain or frequency domain, but how could TDR detect split pairs? https://www.flukenetworks.com/knowledge-base/cableiq/ethernet-split-pair-error-detection-cableiq How does CableIQ detect a split pair error? The CableIQ takes advantage of its DSP (Digital Signal Processor) to look in the time domain for excessive crosstalk. The term time domain indicates that


2.4 GHz DVB-S transmitter test setup working

Started by Jan Panteltje in sci.electronics.design7 years ago 4 replies

2.4 GHz DVB-S transmitter test setup working http://panteltje.com/pub/DVB-S_the_way_I_like_it_IMG_4680.JPG ...

2.4 GHz DVB-S transmitter test setup working http://panteltje.com/pub/DVB-S_the_way_I_like_it_IMG_4680.JPG http://panteltje.com/pub/2.4Ghz_DVB-S_ATV_transmitter_test_setup_wide_IMG_4681.JPG The whole test setup is remotely controlled via ethernet (white lead). I took the ADF4350 test code I wrote and integrated it with the ts2iq program I wrote earlier ( http://panteltje.com/panteltje/r...