Don The K2 with the ATU behaves as expected - internal meter agrees well with the external meter, current draw is as expected, and so forth for various power levels up to 10watts checked out. It was connected to a dummy load.
Without the ATU and the dummy load connected to the base K2 antenna, things are rather strange.... At 2 watts set on the power knob, output on the external meter is 2.7 watts and current draw is 0.96 amps; at a knob setting of 2.4 watts, output is up to 7 watts on the external meter and current draw is 1.4 amps; at a knob setting of 2.5 watts, power output is 10 watts and current draw is 1.96 amps; at 3 watts knob setting, I get the high current warning, and the external meter is pegged. This leads me to believe that the base K2 is overdriving the KPA100. At low power settings - 5 watts, I was pegging the LEDs indicating power on the LDG100 autotuner, at over 125 watts. Ariel NY4G Sent from my iPad On Oct 25, 2012, at 11:51 AM, "Don Wilhelm" <[email protected]> wrote: > Ariel, > > Do not be too quick to conclude that there is something wrong with the base > K2. The basic K2 uses only an RF voltage diode to display the power output, > and it may not be exact - it depends on the load and may vary from band to > band - if it only off by a watt or two, then all is OK That is bypassed > when the KAT2 or KPA100 is installed. > > Yes, do check with the external wattmeter - both with and without the KPA100. > I still think KPA100 diodes D16 and D17 are highest on the suspect list with > other KPA100 wattmeter components being second on that list. > > 73, > Don W3FPR > > On 10/25/2012 11:18 AM, Ariel Jacala wrote: >> Thanks to Jim, Vic and Don for the return comments >> >> I disconnected the KPA100 and put on the K2 top with the KAT2 ATU. With the >> K2 ATU connected and the dummy load connected - the SWR correctly reads 1:1 >> with menu set for CALS. With the menu set to CALP, the power levels >> appeared to modulate correctly with the PWR knob although this is an item i >> have to double check. With the ATU disconnected, the displayed power on >> tune differs from the power setting. This suggests to me that there is >> something wrong with the base K2. I still have to do what Don suggested >> about connection to an external watt meter. >> > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
