Easiest solution, buy the Elecraft DL1 20 watt dummy load kit. The guess work is removed. And it is only $25.95 for the kit. Fun to build simple to use. Even has an RF detector built on.
73, Bill K9YEQ -----Original Message----- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Walter Underwood Sent: Tuesday, December 27, 2016 12:42 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] Dummy loads for dummies If you want a dummy load kit for about as much as you would pay for the box, I highly recommend the Oak Hills Research RFL-100 kit for $40. http://www.ohr.com/rfl100.htm <http://www.ohr.com/rfl100.htm> I used their “BNC in a UHF connector hole” kit to make my dummy load more convenient in my all-BNC shack. http://www.ohr.com/parts.htm <http://www.ohr.com/parts.htm> wunder K6WRU Walter Underwood CM87wj http://observer.wunderwood.org/ (my blog) > On Dec 27, 2016, at 9:41 AM, Mel Farrer via Elecraft > <elecraft@mailman.qth.net> wrote: > > Yes, and you should test the dummy load at the highest frequency you will be > using it. Even leaded non-inductive resistors will have a reactive component > at higher frequencies. > Frankly, I usually test them above the max frequency I intend to use it to > not have any concern about error. > > Mel, K6KBE > > > From: Ryan Noguchi via Elecraft <elecraft@mailman.qth.net> > To: Paul C <paul...@sbcglobal.net>; "elecraft@mailman.qth.net" > <elecraft@mailman.qth.net> > Sent: Tuesday, December 27, 2016 8:16 AM > Subject: Re: [Elecraft] Dummy loads for dummies > >> I made my own dummy load last night from two 100 ohm resistors wired in >> parallel. They are rated for 10 watts each and look like little bricks. I >> measured the resistance at 51 ohms. Do you think this is close enough or >> should I reduce it to 50? > > > >> Paul KG5KXG > > > If your impedance is really 51 ohms, that's an SWR of 1.02. If your antenna > had an SWR of 1.02, would you trim it to get to 1.00, fire up your tuner, or > just start operating? > > However, some of those resistors that look like bricks are really coils > (inductors) inside, which produce a higher impedance than the DC resistance. > Under RF excitation, that dummy load may be well above 51 ohms impedance. > > 73, Ryan AI6DO > ______________________________________________________________ > 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 > farrerfo...@yahoo.com > > > ______________________________________________________________ > 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 > wun...@wunderwood.org ______________________________________________________________ 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 k9...@live.com ______________________________________________________________ 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
