high power op

[Robert Groh]

Hardly a 'little' bit of carrier!  AM is with full carrier - at full 100% modulation (if my memory serves me right) the carrier is equal (in power) to the sum of the two audio sidebands.  DSB, on the other hand, is generally considered to have the carrier fully suppressed (ideally) and practically some 30 to 40 dB down from the two sidebands.  SSB is DSB with one of the two sidebands deleted entirely. 

So the frequency spectral width of DSB is equal to the frequency spectral width of AM - you just don't have the carrier there. Which means you to have re-inject it in the receiver (just like SSB). Or, and this is a special characteristic of DSB, you can manipulate the two received sidebands and develope a local  carrier to synchronously demodulate the DSB signal. 

73
Bob, WA2CKY

----- Original Message ----
From: kd4e <doc at KD4E.COM>
To: BOATANCHORS at LISTSERV.TEMPE.GOV
Sent: Saturday, March 29, 2008 10:05:58 PM
Subject: Re: [BOATANCHORS-TEMPE] high power op

Isn't AM = DSB ... just with a little carrier?

:-)

> Just looking thru the latest QST, talks about the latest ITU conference 
> and how operation on DSB would be ok,  no mention of full carrier AM, so 
> I am not sure what the ARRL is thinking about. Glad my HT-32 does DSB.
> Thanks, George W5GRG



-- 

Thanks! & 73, doc, KD4E
Free OS : http://www.ChurchPup.com
Based on: http://www.PuppyLinux.com
Personal: http://bibleseven.com/kd4e.html
             |_|___|_|
             | | & | |
                {|
        /\      {|
       /  \     {|
      /    \    {|
     /   @  \   {|
     |   |~_|~~~~|
     |   -| |    |
============\ # KD4E

-----------------------------------------------------------
This list is a public service of the City of Tempe, Arizona
-----------------------------------------------------------

Subscription control - http://www.tempe.gov/lists/control.aspx?list=BOATANCHORS
To post - BOATANCHORS at LISTSERV.TEMPE.GOV
Archives - http://listserv.tempe.gov/archives/BOATANCHORS.html




-----------------------------------------------------------
This list is a public service of the City of Tempe, Arizona
-----------------------------------------------------------

Subscription control - http://www.tempe.gov/lists/control.aspx?list=BOATANCHORS
To post - BOATANCHORS at LISTSERV.TEMPE.GOV
Archives - http://listserv.tempe.gov/archives/BOATANCHORS.html