Thursday, April 14, 2016

Homemade dummy load. Post #747.


If you're having trouble viewing this video, please insert this title link into your browser search box: https://youtu.be/Yx5F1jUFySM.  Here's a simple project that you can assemble in your spare time that will help you adjust your transceiver without going on the air and creating needless interference.  A dummy load is a basic piece of equipment that every radio amateur should have in his/her shack.  Although you can buy commercial models, it's more fun and educational to "roll your own."  In this video, "the250rider" shows us how common items around your home and shack can be converted into a practical and cheap dummy load.  The resistor network consists of 8, 100 ohm-1/2 watt 5% tolerance resistors run in a series/parallel circuit.  You can keep the resistor network cool by immersing it in a jar of vegetable oil.  According to "the250rider", this homebrewed dummy load has a measured impedance of 49.8 ohms, close enough for casual use with connecting 50-ohm coaxial cables.  Although this dummy load can take up to 200 watts for a few seconds, it's best to use this device at power levels around 50 watts or less.  For the latest Amateur Radio news and events, please check out the blog sidebars.  These news feeds are updated daily.  Thanks for joining us today!  Aloha es 73 de Russ (KH6JRM).