Tom, I agree. Actually, right now I do not trust my dummy load for being close to pure resistive 50 ohms. Indeed, I did not test it at the beginning and this is what motivated me to post the question. I think I have enough to test the DL but won't have time to do it for a week or so.
peh On Dec 22, 2011, at 12:59 PM, Tommy Alderman wrote: > BUT just because you bought it direct from Palstar does not mean it is a > good dummy load! The ONLY way you KNOW it is a good dummy load is for YOU to > measure it with known good test equipment and an ohm-meter is not how it is > done! > > 73 and Merry Christmas, > > Tom - W4BQF > > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Phil Hystad > Sent: Thursday, December 22, 2011 3:40 PM > To: [email protected] > Cc: Elecraft List > Subject: Re: [Elecraft] K3 + LP100A + Dummy Load > > The dummy load is the Palstar DL2K, full legal limit handling and I bought > it new from Palstar several years ago. None of my operating equipment was > purchased at hamfests -- I prefer to be the original owner and pass over any > potential difficulties. > > peh > > > On Dec 22, 2011, at 12:20 PM, [email protected] wrote: > >> >> Phil, >> >> You don't say what type of dummy load you are using, but all of the > cantenna >> type have about the same SWR curve you witnessed. You will need a > precision DL >> to get a flat response across a large range. I have two DECIBEL DB4304B > 100 >> watt loads here that are flat up through 2m. I don't think they are made > any >> more and if they were they would be very expensive. The two I have were > bought >> at a ham hamfest for $50 each. They are bout 6" x 4" x 4" Most of which > is >> cooling fins. >> >> Be careful when you buy dummy loads like this at a Hamfest. Take a good >> ohm-meter with you. I bought a couple of really well made heavy duty DL's > that >> were rated at 300w for $100 once and when I measured them at home they > were 75 >> ohm loads, so watch out! >> >> Happy holidays, >> >> 73, >> Tom >> Amateur Radio Operator N5GE >> ARRL Lifetime Member >> QCWA Lifetime Member >> >> "If somebody has a bad heart, they can plug this jack in at >> night as they go to bed and it will monitor their heart >> throughout the night. And the next morning, when they wake up >> dead, there'll be a record." >> >> --Mark S. Fowler, FCC Chairman, >> 1981 - 1987 >> >> >> On Thu, 22 Dec 2011 08:37:37 -0800, Phil Hystad <[email protected]> wrote: >> >>> Is this normal or can someone explain? I was looking at the R+iX values > reported by the LP100A with my K3 feeding a dummy load. The SWR reported > was always small but never super close to 1:1. Most of the SWR in this > setup was 1.1:1 up to 1.5:1. The R values ranged from 34 ohms to up to 59 > ohms and X was ranging over a number of smallish values < 20 for all the > bands. >>> >>> Is this what most of you would call normal? >>> >>> Does the K3 output R+iX vary from band to band (I assume so) and is that > what I am seeing? >>> >>> I had thought my dummy load was mostly frequency independent so I am not > sure if I am seeing mostly the K3 here or maybe the K3 plus the 6 feet of > coax (RG8X) + dummy load. >>> >>> 73, phil, K7PEH >>> >> >> >> ______________________________________________________________ >> 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 > > ______________________________________________________________ > 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 > > ______________________________________________________________ > 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 ______________________________________________________________ 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
