While those results are very good, I would like to point out that it is from a sample of one KPA500. I would suggest that an allowance of 10% be considered over the entire population of KPA500s just due to component tolerances giving rise to some unit to unit variation. Even using the 10% variation criteria, the KPA500 is more linear than many other available amplifiers. Elecraft has created another winner.
Those measurements Gary made have substantiated that the KPA500 can be useful whether the driving transceiver is a K1, or K2/10, a K2/100 or a K3/10 or a K3/100 or some other brand of transceiver from QRP levels to 100 watt class transceivers. 73, Don W3FPR On 5/11/2011 11:05 PM, Guy Olinger K2AV wrote: > Adding a power gain and rounding to nearest two digit integer, > considering accuracy of measuring device (rarely more than two > significant digits), it is safe to say that the amplifier keeps its > linearity to 650 watts. The variability at 325 and 410 is most likely > the measuring instrument's issues at lower powers. > > The linearity at the top PEP level is the most important, as squaring > at that level will produce the most distortion energy. Really quite > good. > > ............................. Power Ratio > > 325W @ 15W drive 21.67 22 > 410W @ 20W drive 20.50 21 > 490W @ 25W drive 19.67 20 > 510W @ 26W drive 19.61 20 > 530W @ 27W drive 19.63 20 > 560W @ 28W drive 20.00 20 > 580W @ 29W drive 20.00 20 > 600W @ 30W drive 20.00 20 > 630W @ 31W drive 20.32 20 > 650W @ 32W drive 20.31 20 > 675W @ 35W drive 19.29 19 > 690W @ 37W drive 18.65 19 > 700W @ 40W drive 17.50 18 > ______________________________________________________________ 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
