Howard, You are correct, with nothing connected to the K3 EXT ALC connection, there should be no power reduction for the K3. Yes, you should contact k3supp...@elecraft.com to see if it can be tracked down and corrected.
I am sorry that we initially misinterpreted your email to the reflector. 73, Don W3FPR Howard K2HK wrote: > Don, > > The output of the K3 decreases regardless of whether it is attached to amp or > not when ALC is turned on. At this point I believe the problem to be in the > area of the digital I/O board. If (when) I decide to use the external ALC I > will check it out. > > > > Howard > > > > HK > > > > > > > From: w3...@embarqmail.com > Howard, > > It sounds like the ALC voltage coming out of your amplifier is much > greater than the K3 ALC input range. > > The ALC voltage from your amplifier is reducing the K3 power output. I > believe the problem is with the amplifier, not the K3. > > Remove the ALC connection to your amplifier, then using the K3 power > control, slowly increase the drive to your amplifier while measuring the > voltage being developed at the amplifier's ALC output. It should be > zero or very close to zero until the amplifier comes near its power > limit. If the voltage at the amplifier is in excess of the ALC > threshold you have set on the K3, then the K3 will reduce power. > > In other words, if you want to set the K3 ALC Threshold at -4 volts, > adjust the amplifier's ALC circuits to produce -4 volts when the > amplifier's power limit is reached. > > As others have pointed out, attempting to use the amp's ALC output to > control the power output of the K3 is bad practice and is likely to > produce distorted signals and splatter. > > 73, > Don W3FPR > > Howard K2HK wrote: > I am having a problem with the external ALC. I am trying a new amp that > requires ALC feedback. When I set it in the config menu regardless of the > value -2 to -8 my output is reduced to 60 watts. As I raise the drive it > increases until about 60 watts then cuts back. In the tune position which I > have set for 15 watts I get only 1-2 watts out. This occurs regardless of > whether I am connected to the amplifier or not. The SWR is between 1.2and > 1.5. I do have the mod installed. > > > > > > E-Mail Cleaned by http://mailcleaner.regedanzter.com > > Free Shopping List Software - http://quickshoppinglist.com > > Powered by - http://onlineshoppingcheap.com > > > > > ______________________________________________________________ > 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 > ------------------------------------------------------------------------ > > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 8.5.339 / Virus Database: 270.12.43/2139 - Release Date: 05/28/09 > 08:10:00 > > ______________________________________________________________ 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
