[Heath] SB-200 and AM

[Glen Zook]

The "generic" term, "AM", normally, to most amateur radio operators, refers to a signal amplitude modulated that has the carrier present.  Of course, FM and PM also have a carrier.

However, the modes referred to as SSB and DSB are also amplitude modulated signals even though the carrier is suppressed.  ACSB (amplitude companded sideband) is another signal that falls in this realm.  As such, one can say that all "AM" signals are AM but not all AM signals are "AM".  :>)

That is, all "AM" signals are amplitude modulated but not all amplitude modulated signals are "AM"!
 Glen, K9STH 
Website: http://k9sth.net

      From: Kenneth G. Gordon <kgordon2006 at frontier.com>
 To: ChrisIwata via Heath <heath at puck.nether.net> 
 Sent: Saturday, May 19, 2018 9:05 PM
 Subject: Re: [Heath] SB-200 and AM
   
On 19 May 2018 at 14:48, ChrisIwata via Heath wrote:

> Is there any difference between carrier controlled AM and suppressed carrier DSB?

Yes. A HUGE difference. Controlled-carrier AM is, after all, true AM. It has a carrier whose 
power level follows the average level of the audio. Essentially, the audio controls the 
amount of power out of the amplifier.

DSB is not AM. I supposed one could call DSB, "AM-without-the-carrier".

But DSB is far more difficult to implement than CC-AM.

For one thing, the "simple" methods of generating DSB require two tubes in the final amp 
stage, as I remember it. 

I'll go look it up again just to make sure.

Ken W7EKB


   
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