[AMRadio] W4CJL's Taylor Super Modulation


crawfish crawfish at surfmore.net
Sat Feb 25 00:17:37 EST 2006


There is a circuit of sorts in ER Number 179 with a story about Hoisy not
long after his death.I will see if I can send you a copy.
                            Joe W4AAB
----- Original Message -----
From: "Bob Bruhns" <bbruhns at erols.com>
To: "Discussion of AM Radio" <amradio at mailman.qth.net>
Sent: Friday, February 24, 2006 7:13 PM
Subject: Re: [AMRadio] W4CJL's Taylor Super Modulation


> Hi Tom,
>
> After scouring the internet for a while now, I still
> can't find any articles at all on the details of the
> Taylor circuit.
>
> I found an article by Hoisy from AM Press/Exchange
> where he refers to W6QYT and W3PHL, and the Taylor
> super-modulated circuit.
> http://www.amfone.net/AMPX/65.html
> Scroll down to "The Super Modulation Audio Processing
> Group" which is a little before the middle of the
> issue.
>
> Villard worked with various modulation techniques, and
> he is famous for his involvement in the development of
> amateur SSB.  W3PHL Fred used a high level balanced
> modulator.  (Very high level - 600 watts carrier, 2400
> watts audio).  I think Hoisy was talking about the
> ability to transmit negative carrier with a high-level
> modulated stage, and the ability to modulate beyond
> 100% negative, but he was also talking about negative
> cycle loading, and he said something about an FCC limit
> of 2KW PEP per sideband, so the details may not have
> been entirely accurate.
>
> I also found this page:
> http://glowbug.port5.com/DSB.html
> Lots of stuff on balanced modulation from way back
> when.  All of the designs seem to be about completely
> balancing out the carrier, but the QST article
> references George Grammer's article, "Practical
> D.S.B.R.C. Transmitter Design" from QST Maym, 1951,
> which appears to be about an AM-DSB transmitter that
> can be run at any level of carrier.
>
> There is also Fred W3PHLs article "Modulation
> Unlimited" from around CQ around 1967.  I believe it
> was a two-part article.  He was describing the
> "upside-down tube" high level balanced modulator, which
> can be unbalanced for carrier output by applying DC
> along with the audio.  W3DUQ and I also used similar
> circuits way back when, and K1JJ tried one also.
>
>   Bacon, WA3WDR
>
>
> ----- Original Message -----
> From: "Tom Elmore" <tom at telmore.com>
> To: <amradio at mailman.qth.net>
> Sent: Monday, February 20, 2006 5:19 PM
> Subject: [AMRadio] W4CJL's Taylor Super Modulation
>
>
> > Does anyone know if the articles that, Don Hoisington
> W4CJL, wrote about
> > Taylor Super Modulation still exist today ? I have
> contacted Electric Radio
> > magazine about getting some back issues. I would like
> to get some copies of
> > his work if it was passed along to somebody after he
> passed away.
> >
> >
> >
> >
> > Thank You
> > Tom Elmore  KA1NVZ
> > Anchorage, Alaska
> >
> >
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