Ahhhh...... Thanks. Forgot about the interaction of the ATU bridge and the Power Control setting.
Measured R of MFJ unit = 57 Ohms. Yuk. Replaced it with my NORCAL load which measured 49.5 ohms. Now the LP100A shows SWR = 1.02. Will re-balance the bridge and report back. BTW: don't you ever sleep? On Mon, Dec 17, 2018 at 9:27 PM Don Wilhelm <[email protected]> wrote: > Clark, > > The "secret" is to properly balance and calibrate the KAT2 wattmeter. > > If you do the balance with a dummy load that is truly a 50 ohm resistive > load ( a 1.13 SWR just does not "cut it"), then adjust the forward KAT2 > pot to give you the same K2 display as indicated by the LP-100, your > power should track nicely. > > Your K2 power output does depend on the correct calibration of the KAT2 > wattmeter. > > 73, > Don W3FPR > > On 12/17/2018 9:03 PM, engineercm wrote: > > I'm becoming more active in QRP contesting and need to make sure that my > > power is <5W. I thought I was aligned ok until I put my LP100A into the > > shack (what a wonderful instrument). When Power Control = 5.0, the > LP100A = > > 3.0. Now, I want to be below 5.0, but not that low! To reach LP100A = > 5, > > Power Control must be set at 7.5 (40m) and 8.5 (20m). This is with the > ATU > > = Cal(P), which removes the matching circuits. The dummy load is a > MFJ-264; > > the LP100A SWR = 1.13. > > > -- 72, Clark, WU4B QRPARCI #10815 SKCC #3892 NAQCC #5055 CWOPS #1869 Collins Collectors #AC90-12432 Southeastern DX Club <http://www.sedxc.org> North Georgia QRP Club <http://www.nogaqrp.org> *"It is vain to do with more what can be done with less."* *Attributed to *William of Occam (1288 AD - 1348 AD) ______________________________________________________________ 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]
