Michael, Increase R4 to 100K and the voltages will drop. If you read the KPA100UPKT instructions carefully you will find the instruction to check R4 and change it to 100k if necessary in 'PART IV:Other Changes'
73, Don W3FPR > -----Original Message----- > > I performed the voltage checks at the KPA100 Test Points as > stated on page > 43 of the KPA100 manual (rev. C, Feb. 11, 2004). The D13 cathode should > have a voltage between 90 and 150 volts; the measured voltage is > 175 volts, > which seems a little high. Also, the voltage measured at U4 pin is -30 > volts, but the manual indicates the voltage range should be > between -5 and > -25 volts. > > Consulted the schematic and it appears as if the voltage from pin 8 of U4 > supplies the High Voltage Bias Supply circuit. Mesaured the > voltage at C44 > as 45 volts, but schematic indicates it should be 30 volts. > > Is 175 volts too high a voltage at the D13 cathode? R4 is 39K. > > Any suggestions or help would be greatly appreciated! > > Michael > KI5E > -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.432 / Virus Database: 268.16.9/622 - Release Date: 1/10/2007 2:52 PM _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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
