[AMRadio] AM power

Sun Jun 19 21:42:57 EDT 2011

And the chimpanzee reference has a strong tie to hams. Besides the guys you see 
at hamfests with antennas mounted on a hard hat, wearing a tee shirt that says 
Foreign Exchange Student Roswell High class of '47, whose knuckles are dragging 
on the ground............the first American astronaut was a chimp named Ham. 

Bill AD5OL

________________________________
From: James Liles <james.liles at comcast.net>
To: Discussion of AM Radio in the Amateur Service <amradio at mailman.qth.net>
Sent: Sun, June 19, 2011 5:51:18 PM
Subject: Re: [AMRadio] AM power

Hey Bill, Jim:

I was being a bit silly.  Was in jest referring to a mechanical device to 
work the key so as to make it sound vocal.  Just trying to get past the turf 
wars.  Bill, that brings back old memories.  My thesis project was a twelve 
channel digital proportional guidance system circa 1964.  That was an 
exciting decade.  Simply trying to get the reflector out of the loop.

Kindest regards Jim K9AXN

-----Original Message----- 
From: Jim WB5OXQ inb Waco, TX
Sent: Sunday, June 19, 2011 3:45 PM
To: Discussion of AM Radio in the Amateur Service
Subject: Re: [AMRadio] AM power

Sounds like digital am similar to what the Harris DX series transmitters do.
There is no modulator amplifier just a analog to digital converter turning
off and on the rf stages in step with the audio.  I know these are very
efficient, cool running and have wonderful fidelity to the audio compared to
a plate modulated transmitter.
These run 100% carrier power during quiet audio times to better quiet the
receiver listening to the station.  Jim Hawkins has a page explaining how
this works.
This should be possible by using IC's on a smaller scale than a multi KW
broadcast transmitter.  Maybe cleaner audio with less splatter too.

----- Original Message ----- 
From: "BILL GUYGER" <bguyger at sbcglobal.net>
To: "Discussion of AM Radio in the Amateur Service"
<amradio at mailman.qth.net>
Sent: Sunday, June 19, 2011 2:41 PM
Subject: Re: [AMRadio] AM power

> Not to be catty, but doesn't that describe Pulse Width Modulation? Key
> down
> longer for wider pulses?
>
> Bill AD5OL
>
>
>
>
> ________________________________
> From: James Liles <james.liles at comcast.net>
> To: Discussion of AM Radio in the Amateur Service
> <amradio at mailman.qth.net>
> Sent: Sun, June 19, 2011 12:26:55 PM
> Subject: [AMRadio] AM power
>
> Hi all:
>
> This thread has been an interesting visit to the world of perception and
> psychology.  Does anyone have any information regarding the modulation
> technique, that when applied to the STRAIGHT KEY, simulates the human or
> chimpanzee voice?  Novel idea to make use of the CW band space using a 1KW
> carrier to convey audio.  Probably need a redesign of the key click filter
> though ayh.  I think ayh is a colloquial  for what do you think.  Thought
> a
> new idea would bring a breath of fresh air to the thread.  Seems I had a
> short circuit or cranial RF burn following this most interesting thread.
>
>
> Kindest regards and a happy fathers day    Jim K9AXN
>
>
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