On Sat, 3 Jan 2009 08:58:57 -0600, Phil & Debbie Salas wrote: > "Hot switching RF in an external ATU is not to be recommended for > any radio at any level." > > BUT - you DO hot-switch your K3's RF output when using any relay-based > auto-tuner, including the internal K3 auto-tuner. So my reasoning is that > I'd rather hot-switch the 100-watt PA at 15 watts rather than the 10-watt PA > at 5 watts. And then, my MFJ-998 (which I use with my ALS-600) reads SWR > more accurately at 15 watts than it does at 5 watts, so when I go to full > power the tuned SWR is still minimum. As Wayne stated earlier, SWR readings > at low power may be less accurate due to the detector diode voltage drop at > low power. > > Phil - AD5X > OK, to be strictly accurate......
"Hot switching RF in an external ATU (other than auto-tuners designed to be operated that way) is not to be recommended for any radio at any level." I am sure that the *internal* K3 ATU has been designed to perform its tuning function at a safe power level, whatever output power level the operator selects. Using the LP-100A I am avoiding (for the present) the influence detector diode volts drops vs power have on my SWR measurements. Stewart G3RXQ > _______________________________________________ > Elecraft mailing list > Post to: [email protected] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
