Hi Guy, Apparently the reflector does not pass emails with large attachments. I think it is pretty graphic and I would like others to see it if I can figure out how. I'll call SteppIR tomorrow and discuss it with them. I support your recommendation that they take that recommended method of operation out of their manual. I will forward that email to Gianfranco at SPE (Expert).
Thanks for all your help. 73 de W6BK On May 16, 2010, at 1:20 PM, Guy Olinger K2AV wrote: > Hi Dave, > > I'm not sure that the embedded picture I received from you would be passed by > the reflector, so I'm just quoting your text below. > > The graphics show that peak distortion in the adjacent channel was only down > 25 db from in-channel max power. This even though your trebled up voice is > still fairly bass controlled. > > Which means that if you were up or down from this signal at 20 over on > channel, you would be hearing S8 or S9 splatter from it. Sounds familiar, > doesn't it. > > The 1500 watt power spike is particularly frightening, especially if it comes > out of my wallet. Might want to pass your results on to the manufacturer as > a customer and request they pull that recommendation from their publications > and web page. Make sure they understand it's getting them a lot of bad press > and is NOT panning out. > > About as graphic an underscore to Wayne's warning as one can get. (Sorry, > couldn't resist....) > > 73, Guy > > >> > > Hello Guy, > > Well, you sure called it. This screen shot is taken under the same > conditions as the previous ones except that the tx equalizer was set to try > and simulate a Heil HC4. The tx equalizer settings were: 1 - 0db, 2 - 0db, 3 > - 0db, 4 - 0db, 5 - +2db, 6 - + 4db, 7 - + 10db, and 8 - +10db. Two things I > noticed right away: First, the peak power is nearly 1500 watts! I sure am > glad I still have finals in the Expert. Second, there is definite splatter > as evidenced by the light and dark blue on the Modulation quickview window. > > One can say a lot of things about these tests but one thing comes through > loud and clear to me: > > ALC should not be used to control the K3 set to 100 watts with the Expert 1K > FA. Rather the power should be set on each band to just what the Expert > needs to reach full power. > > To do otherwise may cause splatter and might result in final failure. How > long can the Expert finals take this kind of abuse? > > 73 de W6BK ______________________________________________________________ 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
