Kurt, Have you set the drive power level as indicated on page 9 of the KPA500 manual? After setting the drive power level, run the KPA500 at full power output and then adjust the ALC Threshold as indicated on page 10 of the manual.
If you are not driving the KPA500 to full output, you should see no change when adjusting the ALC Threshold. Remember that the ALC signal is communicated back to the driving transceiver telling it to reduce its power output. If you are using an early K3, has the mod for handling negative going ALC been installed? Have you set the K3 EXT ALC menu parameter as indicated on page 27 of the K3 manual? It is best to make those adjustments into a dummy load capable of handling 500 watts or more. If you do not have a suitable dummy load, use whichever antenna provides you with a low SWR - the closer to SWR=1 the better the results of your settings. 73, Don W3FPR On 10/29/2011 11:23 AM, walter renner wrote: > I have KPA500 #429, and I really love the amp, but have been confused by the > ALC threshold settings. > > Maybe someone on this list can help me with a question I have concerning > what it operation. > > The ALC settings are from 0 to 210, and I find that it has no effect on power > out regardless of where I set ALC. > The power out remains the same whatever the settings. Nothing changes from 0 > to 210 on power out. Any ideas setting has the least effect on > power out or what setting has the most effect. > > > Kurt K0ARO > ______________________________________________________________ > 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
