[AMRadio] anyone for qrp am?


Jim candela jcandela at prodigy.net
Sun Mar 6 18:02:06 EST 2005


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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