A properly connected and adjusted ALC system that responds to amp/antenna anomalies by signalling the rig to cut back on drive might be useful. Don't know how it would respond to keying weirdness.
Jerry W4UK At 05:57 1/9/2009, Mike Cox wrote: >Ouch.. that could blow the pin diodes or protection circuits in my >internal Ameritron PIN5 QSK switch if the amp were in the "Operate" mode >and RF were applied from the rig without the KEY line activated. It is >imperative that the KEY line be actuated before RF hits the amplifier >input to avoid damage to the pin diode switch. With Ameritron amps with >an internal pin diode switch, the wiring is such that the only time the >amplifier is actually bypassed is when the OPERATE switch is in STANDBY. >Otherwise the path is to the amplifier input AND the pin diode switch. >In this mode, the KEY line only goes to the pin diode switch, not the >main OPERATE relay which would otherwise bypass the amp. I normally >don't put the amp in the "Operate" mode until after the antenna is tuned >using the normal K3 "TUNE" mode while the amp is bypassed. If I forget >to tune the antenna first and operate the amp I get a huge reflected >power (seen on the tuner bridge) but nothing catastrophic for a short >operation of my AL-1200. If the KEY OUT is to be optionally disabled >during K3 TUNE, it MUST be a menu selected option or it will result in >damaged equipment. > > >Bill Johnson wrote: > > I would like the key out not to switch on the amp when tuning the antenna > > with a remote tuner without turning on the amp. That way when I > operate the > > amp is loading into a tuned circuit via the K3 tuning > mechanism. I have the > > ALS 600S > > > > > > 73, > > > > Bill > > K9YEQ _______________________________________________ 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
