Franco, you should only use the ALC as amplifier protection. ARRL's 1K-FA product review listed the 1K-FA drive requirements as 28-32 watts typical for full output. Driving it at 100 watts and using dynamic ALC to reduce the level to 30 watts running SSB definitely will produce varying results. This is not a K3 problem. Since the ALC had been reducing your drive to 30 watts, the K3 is operating with the idea that when you set the power to 100 what you really need is 30. When you put the amp in standby, it takes a while for the K3 to figure out, by lack of ALC coming from the Expert, that now you really do want 100 watts with the power knob at 100 watts.
The K3 has a slow power recovery curve to keep from spiking amps in similar situations where ALC is slow or non existent. Reduce the K3 output power to 25 watts and only increase it until you have full power from the Expert which DOES NOT engage the Expert ALC. Use a peak power meter, or adjust it on CW to determine the drive. Do NOT use ALC to accomplish speech compression, use the compression control in the K3, which is a far more clever digital method without the side effects. Driving the ALC more than three times normal drive power WILL produce splatter, no matter how good manufactures say their ALC is. 73, Guy On Wed, Apr 21, 2010 at 3:03 AM, Franco Cazzaniga <f.ame...@tin.it> wrote: > Hello > I use the Expert 1K-FA with K3 full power and ALC , but i think i have two > issue. > When i use K3 full power ( with Expert full power ) the rig output is not > stable but fluctuates around 15 watt and more or less of 5 watt , and of > course the output of Expert varies consequently . > When i use Expert half power i have not issue , the input and output power > are stable. > Another issue is that when i put the Expert in STBY , the K3 output power > does not return instantly at 100 w , but slowly in 3 - 4 seconds. > When i not use the ALC i have not issue. > Thank you > Franco I6QFZ > ______________________________________________________________ > 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 > ______________________________________________________________ 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
