Browse over 10,000 Electronics Projects using the Page Numbering provided at the bottom of each Page.

How to build baluns for 10Base5 Ethernet

How to build baluns for 10Base5 Ethernet

Your transmit and receive pairs need to be just that – pairs. Single wires would not cut it trying to carry 10 megabit data rates. Particularly with this pinout, since pins 1 and 4 in your jack should be paired together. The crosstalk after just a few feet of wire would wipe the signal out completely.
If you need to run ethernet on one twisted pair, you should use 10base2 (thin coax) equipment with baluns. These convert the unbalanced coax signal into a balanced signal usable on twisted pair. They are available in many of the wiring products type catalogs. I’ve seen them most recently from DataComm Warehouse for $19/each, which is high.

I’ve modified a number of IBM3270 type baluns, which are available for $4 or so to work with 10base2. They are probably not as good as the ones built specifically for ethernet, but I’ve used them through a few hundred feet of good quality (Catagory 5) cable. These contain (at least the cheapest ones, which is what you’d want) nothing more than a small 1:1 toroidal transformer. You need to rewire the leads to connect it as a current balun, like this.

This does not provide proper impedance matching of the ~100 ohm twisted pair to the 50 ohm coax, but testing seems to indicate this doesn’t matter much.

Visit Here for more.

 

More Articles to Read

Single-Sided USB Charger
Single-Sided USB Charger
A FPGA controlled RGB LED MATRIX for Incredible Effects – the Hardware
A FPGA controlled RGB LED MATRIX for Incredible Effects – the Hardware
Using Nanotimers to Reduce IoT System Power Consumption by an Order of Magnitude
Using Nanotimers to Reduce IoT System Power Consumption by an Order of Magnitude
Replace a microwave’s beeping with the Windows XP startup sound
Replace a microwave’s beeping with the Windows XP startup sound
A DIY Laser Scanning Microscope
A DIY Laser Scanning Microscope
Reverse-engineering the surprisingly advanced ALU of the 8008 microprocessor
Reverse-engineering the surprisingly advanced ALU of the 8008 microprocessor
ESP8266 LED lighting: QuinLED v2.6 PCB
ESP8266 LED lighting: QuinLED v2.6 PCB
Switching LVDS Graphics in a Laptop Computer
Switching LVDS Graphics in a Laptop Computer
Teleknitting: TV-based string art
Teleknitting: TV-based string art
DIY Bubble Machine
DIY Bubble Machine
Start your day with Nerf target practice!
Start your day with Nerf target practice!
Teardown of a Peaktech 6225A
Teardown of a Peaktech 6225A

Top




Shares