Tom, The voltage at U4 pin 3 should be between 3 and 4 volts with 5 watts of power flowing through the wattmeter section of the KAT2 *and* with the FWD potentiometer (R1) fully clockwise.
U4 is configured as a unity gain op amp, and the voltage at the output (pin 1)should be equal to the voltage at the input (pin 3). If it is not, check the soldering at U4. That should be true whether R6 is connected or not. If the conditions (and results) are not as stated, then as the manual states, check T1, D1, C50, C52 and R1 for good soldering. Count the turns on T1 to be certain you have not wound an extra turn. Is the power that you are passing through the KAT2 equal to 5 watts? How are you determining it? 73, Don W3FPR Tom Campie wrote: > Still no solution for my power problem. Some correspondence with Gary at > Elecraft has me back where I started. I removed R6 and saw 0V at the output > of U4 but 2.5V on the input of U4 coming from U1 (pin 3 on U4). According > to the testing in the manual this should be 3-4 volts with a requested power > of 5 watts. I replaced R6 and now saw the 2.5V on the output of U4. This > is still low obviously. I reflow'd all the solder joints in the SWR bridge > as it suggests and this has not helped. I'm not sure where to look next. > > Tom W0EA > > ______________________________________________________________ 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
