My bias current settings are: 275 mA (power knob set fully CCW) 475 mA (power knob set to 11 watts) Target 875 mA total (with the 400 mA added per the instructions) In CW test mode, I set bias control R6 to show a reading of 875 mA
Current draw: 12W = 6.6A 40W = 10.0A (note: peaks at 14W then steps down to 12W) 120W with Power set full CW Checked all of the diodes for proper orientation. Fan is orientated correctly with label out. my fan pulls the air OUT. There seems to be some confusion regarding the direction of air flow. Others advised it should be pushing air in. With the fan setting in "normal" mode, it goes directly to high speed when it kicks in. I should think it would go to low speed first and then step up to high speed if the temperature increases. Balanced and calibrated the wattmeter. I checked Q1 Q2 Q3 Q4 DC voltages in RX and TX. All are good according to the Voltage Chart provided in the manual. I had to order a new Fan, because of a mistake I made. It should be here by the end of the week. I will provide temperature data when it is reinstalled. 73, Ken N4KSk2/100 -------------------------------------------- On Fri, 5/19/17, Don Wilhelm <[email protected]> wrote: Subject: Re: [Elecraft] K2/100 overheating? To: "N4KS" <[email protected]>, "[email protected]" <[email protected]> Date: Friday, May 19, 2017, 6:02 PM Ken, Did you set the bias properly? What is the current draw at 12 watts? Did you properly balance and calibrate the wattmeter? Are all the diodes oriented properly? Check against the parts layout near the back of the manual. Make certain the fan is mounted with the label out and that the red wire is in the +hole and the black one in the -hole. The fan should exhaust the hot air. Cooler air flows in at the front of the heatsink. 73, Don W3FPR On 5/19/2017 8:01 AM, N4KS via Elecraft wrote: > I recently added the KPA100 to my K2. The heat sink gets VERY hot at any power level above 11 watts (that's when the amp kicks in). The fan is running at high speed and pulling air OUT of the box. Just wondering if this is normal. ______________________________________________________________ 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 Message delivered to [email protected]
