The build for K2 ser # 5628 has been going well until I got to the "Alignment and Test Part III" 40 meter transmitter alignment section.
Problem: With current set to 2.0 AMPS and the power control fully CCW I measured 7 watts on an external wattmeter. The internal wattmeter had NO indication. When I press the "tune" control with the display set for voltage and current I see 13.3 volts and 1.88 amps. The current will start to slowly rise at .02 amps per second and will reach 2.00 amps in about 10 seconds and the "HI CURRENT" message will appear with 7 watts output. If I set the power to .5 watts the current will start out at 1.98 amps and the 2.00 amp threshold and "HI CURRENT" message will appear much quicker - about 1 second. I still get 7 watts of output indicated on an external wattmeter. Setting the current to 3.00 amps and the power control fully CCW I get 12 watts out with 13.0 volts and the current starting at 2.84 amps creeping up at .02 amps per second. At around 10 seconds the HI CURRENT message will appear when 3.0 amps has been reached. Setting the power to .5 watts will cause the same thing to happen but HI CURRENT message appears quickly with 12 watts output. Additional Info: The K2 has passed all checks up to this point. I am using a Heathkit 50 ohm dummy load. Turning the power control up or down gives the indication of the desired power but has no effect. L1 and L2 gives a nice peak for 40 meters. They were very close if not right on from the 40 meter receiver test. Measuring the resistance at the collectors of finals Q7 and Q8 shows 3.7K for both transistors. The power output is being controlled by limiting the current not by the power control. The internal wattmeter gives no indication on transmit but works as an S meter on receive. I am using a 30 amp Ashton switching supply. It was Sunday evening so I called it a day. Best, Joe Szczubelek - K9DMV ____________________________________________________________________________________ Have a burning question? Go to www.Answers.yahoo.com and get answers from real people who know. _______________________________________________ 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
