[AMRadio] anyone for qrp am?


Edward B Richards zuu6k at juno.com
Sun Mar 6 19:26:35 EST 2005


Thanks, Jim.

73, Ed Richards K6UUZ
AMI member #1534


On Sun, 6 Mar 2005 17:02:06 -0600 "Jim candela" <jcandela at prodigy.net>
writes:
> 
> 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: amradio-bounces at mailman.qth.net
> [mailto:amradio-bounces at mailman.qth.net]On Behalf Of W7QHO at aol.com
> Sent: Sunday, March 06, 2005 4:00 PM
> To: zuu6k at juno.com; amradio at mailman.qth.net
> Subject: Re: [AMRadio] anyone for qrp am?
> 
> 
> 
> In a message dated 3/6/05 1:40:13 PM, zuu6k at juno.com 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
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