Some of the best dummy loads are built from Caddox Thick Film Resistors. The 50 ohm resistors are non-reactive and flat up through 500 MHz. They MUST be mounted on a heatsink to achieve their power rating.
Using careful wiring practices (close to zero length leads), you can wire 4 of the 25 watt versions in series-parallel for a 100 ohm dummy load, but there is a 100 watt version available that will do a better job.
73, Don W3FPR On 8/26/2018 8:50 AM, Bill Frantz wrote:
For my KX3, I built a dummy load from three 150 ohm 2 watt resistors and a BNC connector. The resistors are in parallel with a lead going to the center conductor of the connector. The other leads are folded back over the resistors and attached to the ground-side of the connector. The whole outside is then covered with a piece of coax braid. It does well on the antenna analyser test Bob, K4TAX suggests.
______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
