Randy, That tells me that HRD is not using the extended PC command format.
The consequences of going from high power to low is that the scaling resistors in the KAT100 will be active (they would normally switch out of the circuit going from high to low power), and the power detection at low power (<11 watts) will be incorrect - there will not be as much voltage on the VRFDET line as the K2 is expecting and the K2 power control circuits will try to increase the power to bring up the VRFDET voltage. The result will be either high power output (i.e 100 watts instead of 10 watts) *if* the KPA100 is also in high power state like the KAT100 or if the KPA100 is in low power state (but not the KAT100, the base K2 will put out maximum power and may give HI CUR messages. Alternately if the KAT100 stays in low power mode, the KPA100 will only have 1/10 the expected power. Since HRD apparently does not do the low power/hi power switching, I would recommend that you operate only within either the low power range or the high power range when changing the power through HRD. To switch ranges, use the K2 power knob and then proceed with HRD as normal. 73, Don W3FPR Randy Moore wrote: > Don, > > My K2 is running 2.04r and I have HRD 4.1 Build 2055 Beta, which I think > is the most recent. > > My real question is what is happening in the KPA100 and the K2 when this > happens? Practically speaking, it isn't much of an operational problem. > > 73, > Randy, KS4L > > Don Wilhelm wrote: > >> Randy, >> >> If your K2 firmware is less than version 2.02e then the problem is >> with your K2 firmware. >> If the firmware is 2.02e or greater, then HRD is the problem. What >> version of HRD are you using? If it is an older one, that may be your >> problem. >> >> See the K2 Programmer's Reference. The Extended form of the PC >> command must be used to change the power from the low range to the >> high range. >> >> I don't know whether Simon has implemented the Extended version of the >> PC command in his software. You may want to ask that question on the >> HRD forum. >> >> I cannot check it out here, I have only the QRP K2 and no KAT100. >> >> 73, >> Don W3FPR >> > ______________________________________________________________ > 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: 8.5.329 / Virus Database: 270.12.26/2110 - Release Date: 05/12/09 > 06:22:00 > > ______________________________________________________________ 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
