home bbs files messages ]

Just a sample of the Echomail archive

Cooperative anarchy at its finest, still active today. Darkrealms is the Zone 1 Hub.

   AMATEUR_RADIO      Ham radio for when Armageddon strikes      2,531 messages   

[   << oldest   |   < older   |   list   |   newer >   |   newest >>   ]

   Message 583 of 2,531   
   TOM WALKER to ROY WITT   
   Resurrected   
   21 May 14 11:31:00   
   
   RW>Greetings Ed!   
      
   RW> TW>> I have no problem with that but it stil lstands that the Word   
   RW> TW>> "Carrier" is a Standard term  used to describe the RF signal   
   RW> TW>> eninating form a transmitter.   
      
   RW> RW>> Then how do you explain the non-carrier of a SSB transmission?   
      
   RW> EV> Howdy! Roy,   
      
   RW> EV> I learned SSB has a Surpressed Carrier, the Carrier is still there   
   RW> EV> it's just not at Full Strength.   
      
   RW> EV> Does that sound correct to You?   
      
   RW>No. If you do as I have done and key the mic on a SSB xmitter, there is   
   RW>nothing shown on a Bird wattmeter until you modulate the radio. Then the   
   RW>wattmeter's needle will bounce up and down, according to the modulation.   
      
   RW>So, the carrier that isn't there on key up, might be there in theory, but   
   RW>it won't be there, even when the xmitter is modulated.   
      
   BUT Roy there are several variations of SSB and NOT all totaly supress   
   the Carrier.   
      
   "Reduced-carrier transmission is an amplitude modulation (AM)   
   transmission in which the carrier wave level is reduced to reduce wasted   
   electrical power. Suppressed-carrier transmission is a special case in   
   which the carrier level is reduced "below" that required for   
   demodulation by a normal receiver."   
      
   Ref - http://en.wikipedia.org/wiki/Reduced_carrier   
   ---   
    þ SLMR 2.1a þ Typo Tom Strkes Again   
    * Origin: TECHWARE BBS -  Since 1995  -  www.techware.dynip.com  (1:102/401)   

[   << oldest   |   < older   |   list   |   newer >   |   newest >>   ]


(c) 1994,  bbs@darkrealms.ca