For parts, digikey.com and mouser.com are good friends. No minimum order, great prices and huge selection.
You've gotten several suggestions for a good dummy load. And I concur with the others, those wire-wound resistors might be 50 ohms but their reactance may almost anything and dependent upon frequency. One of the original "Elecrafter Field Testers" and "F.O.W." - friend of Wayne (Burdick) - was Tom Hammond, N0SS, no sadly an S.K. But his web site has been maintained and it contains a great low-cost dummy load design: http://www.mmccs.com/mmarc/n0ss/dl_30w_hf-uhf.pdf You might enjoy looking around the web site for more KX1 info and QRP info in general: http://www.mmccs.com/mmarc/n0ss/ Coaxial cable is every much as low loss as open wire line when the SWR is not too high. The difference in applying them is that the inherently higher-impedance of ladder line makes it much easier to keep the SWR on the line low enough to avoid excessive loss. For example, a hunk of wire between 50 and 100 feet long strung up in the air and fed at its center will show an impedance of about 4,000 ohms at the frequency at which it is 1/2 wavelength long and perhaps as low as 40 ohms on 80 or 160 meters. With open wire line at about 400 ohms impedance, you will find an SWR of up to 10:1 on the feed line, generally much less. With 50 ohm coax, the SWR will range as high as 80:1 or more. Have fun. At my shack, simple and cheap is great fun! 73, Ron AC7AC -----Original Message----- From: Elecraft [mailto:[email protected]] On Behalf Of Paul C Sent: Tuesday, December 27, 2016 12:23 PM To: Walter Underwood; [email protected] Subject: Re: [Elecraft] Dummy loads for dummies Ok, I won't be using these resistors after all. Thanks for setting me straight. It seems tuff to get going in QRP. I thought I'd roll my own when possible. I am trying to keep things simple and economical, the QRP spirit. Here's another naive idea of mine: I'm planning to use ladder line too. Now I'm waiting for the other shoe to drop, when I realize coax will be my only practical choice. Paul KG5KXG -----Original Message----- From: "Walter Underwood" <[email protected]> Sent: 12/27/2016 1:45 PM To: "[email protected]" <[email protected]> Subject: Re: [Elecraft] Dummy loads for dummies Ah, yes, bricks. Like these? https://www.radioshack.com/products/radioshack-100-ohm-10w-10-wirewound-resistor-2-pack# <https://www.radioshack.com/products/radioshack-100-ohm-10w-10-wirewound-resistor-2-pack#> wunder K6WRU Walter Underwood CM87wj http://observer.wunderwood.org/ (my blog) > On Dec 27, 2016, at 11:42 AM, Vic Rosenthal <[email protected]> wrote: > > They are undoubtedly wire-wound resistors and will have too much inductance > to work well as a dummy load. The resistance is fine. If you have an SWR > meter, check it with that. SWR below about 1.5 would mean it is usable. It > might be OK on 160 or 80 meters but not on higher bands. > > Vic 4X6GP > >> On 27 Dec 2016, at 16:43, Paul C <[email protected]> wrote: >> >> 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 >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[email protected] >> >> This list hosted by: http://www.qsl.net Please help support this >> email list: http://www.qsl.net/donate.html Message delivered to >> [email protected] > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net Please help support this email > list: http://www.qsl.net/donate.html Message delivered to > [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
