Thanks Don. CB checked out at 7.85v and removed resistor. Current drain test was good at .14a
Best Don KF7DS Don Wilhelm <[email protected]> wrote: >Don. measure the voltage at the output side of Control Board 4. It >should be in the vicinity of 8 volts. > >I would suggest removing the 15k resistor and checking the voltage at CB >U2 pin 5. If that voltage is 3.7 volts or more, that will work out just >fine. If lower than 3.7 volts, add back the resistor and set he AGC >Threshold voltage for somewhere between 3.75 amd 3.8 volts as measured >at Control Board U2 pin 5. > >73, >Don W3FPR > >On 8/24/2012 8:39 PM, Don Singer wrote: >> I am finishing the first phase of my K2 build, and everything has gone >> well up to this point. All resistance and voltage tests are fine. >> >> When I went to set the AGC Threshold as per page 47 of the K2 Manual, I >> got 5.0 volts as the lowest setting I could achieve when adjusting R1 on >> the Control Board , so I followed the instructions at the top of page 48 >> and followed the AGC Level Application Note and installed the 15K >> resistor between pins 3 and 4 of RP6 on the Control Board. >> >> The resistance across the 15k resistor, once installed on the Control >> Board on pins 3 and 4, was 3K. I reflowed the solder to see if I could >> get the 3.5k ohms specified on the worksheet, but still got 3K and >> thought that is good enough. >> >> I reassembled the K2 and ran the AGC Threshold section again - but, >> instead of being closer to 3.8 volts, I am now at 6.2 volts as the >> lowest reading I could get. The lowest voltage went up and not down? Why >> is that? >> >> I am not sure if this is meaningful or not so I am holding from moving >> forward until I know if this is an issue, or just move on, or remove the >> 15k resistor across pins 3 and 4 of RP6? >> >> Thanks, >> Don KF7DS >> ______________________________________________________________ >> 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 >> > ______________________________________________________________ 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
