Best thing to do is insert a choke in the screen circuit. A small choke, 15 henrys or more will work. Otherwise, you have to run the screen off a voltage divider, some from the unmodulated B+, and some from the modulated B+.
The choke setup MAY hose you up on cw if you run cw, so a switch or some quick way to remove the choke might be needed. Brett N2DTS > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Behalf Of RJ Mattson > Sent: Tuesday, April 06, 2004 11:19 PM > To: [email protected] > Subject: [AMRadio] Plate modulating a 807 > > > This url is to my Hammarlund Four20 AM transmitter schematic. > http://www.hvinet.com/rjmattson/four20schematic > The PA 807 screen does not seem to be modulated through a dropping > resistor or self modulated with a choke. The Hammarlund Four11 > plate modulator is connected in place of jumper MOD on the > schematic. Should I try it as is or rewire? > > bob...w2ami > www.qrz.com/callsign/w2ami > > _______________________________________________ > AMRadio mailing list > [email protected] > http://mailman.qth.net/mailman/listinfo/amradio
