I would be interested in that Dennis. TNX. Mod-U-Lator, Mike(y) W3SLK ----- Original Message ----- From: <[EMAIL PROTECTED]> To: <[email protected]> Sent: Saturday, March 18, 2006 11:07 PM Subject: Re: [AMRadio] Amplifier to use with my DX-60
For a simple and very effective modulator for rigs in this power class that doesn't require increasingly hard to find modulation iron, let me recommend a Heising circuit originally described in the April 1955 issue of Radio and Television News and revisited in ER #91, Nov. 1996. The scheme utilizes a clever bias shifting scheme to squeeze 30 - 40 watts of audio out of a single 807 modulator tube. No transformer required, only a 10 H filter choke. Won't modulate 100% in the negative direction (in common with other Heising circuits) but comes so close you can't tell the difference. The original author called it a "Reference Shift Modulator." Can provide more information if anyone's interested. 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:[email protected] AMfone Website: http://www.amfone.net AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb
