Another alternative is series modulation. This has efficiency issues using a class A series modulator, but for low power AM this might be the ticket. At the following link are two circuits that I found somewhere, and am just passing them on. I never tried them.
Regards, Jim WD5JKO http://pages.prodigy.net/jcandela/Modulator/ -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of [EMAIL PROTECTED] Sent: Sunday, March 06, 2005 4:00 PM To: [EMAIL PROTECTED]; amradio@mailman.qth.net Subject: Re: [AMRadio] anyone for qrp am? In a message dated 3/6/05 1:40:13 PM, [EMAIL PROTECTED] writes: > I, also,would like to build a QRP AM rig. I have the 6L6's and 1625's. > What I need is a modulation trandformer. Any suggestions, anyone? Thanks. > For a plate modulator that works great and does not require a hard-to-find transformer try the circuit described by Dale Hileman in the April 1955 issue of Radio and Television news. Heising circuit with a clever bias shifting scheme included. Hileman called it a "Reference Shift" modulator. Circuit revisited in ER #91, November 1996 with some updates for using several popular sweep tubes in place of the 807 originally employed by Hileman. Dennis D. W7QHO Glendale, CA ______________________________________________________________ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net -- No virus found in this incoming message. Checked by AVG Anti-Virus. Version: 7.0.308 / Virus Database: 266.6.2 - Release Date: 3/4/2005 -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.308 / Virus Database: 266.6.2 - Release Date: 3/4/2005
