Modulation Modes

Modulation Modes

CW (Continuous Wave)
This uses the narrowest signal possible. Morse code is used to communicate with CW. Due to the narrow bandwidth the transmitted power is concentrated over the smallest segment and tends to work when no other mode will.

AM (Amplitude Modulation)
This mode consists of a carrier at the center of the transmission with two side bands on each side of the carrier. The Amplitude of the sidebands are varied to carry the signal.

SSB (Single Sideband)
This mode is related to an AM signal. The carrier and one of the sidebands are suppressed leaving the transmitted power concentrated over just one sideband. This mode is 3KHz wide. LSB (Lower Sideband) is typically used below 10MHz and USB (Upper Sideband) is typically Used above 10MHz. The 60 Meter band is a notable exception to this. On the 5 channels allocated to secondary amateur use only USB can be used for phone.

FM (Frequency Modulation)
This mode has a carrier that is modulated by varying the frequency to carry the signal.

Recent Posts

Zombie Special

image

After much planning and careful implementation the “Zombie Special” antenna is finally on the air.   Basically this is a caged fan dipole.   I have gotten fantastic signal reports on 75 meters in excess of the standard fan dipole that this antenna replaced.  It also seems to hear extremely well also.  I have already heard stations that I’ve never been able to copy before the highlight of which was a QRP station in Oklahoma running 5 watts. 

  1. Upcoming 2014 Field Day Leave a reply
  2. The Towers Global Warming Woes 1 Reply
  3. Server Upgrade Leave a reply
  4. Field Day Event Leave a reply
  5. AAU Certificates Leave a reply
  6. “Du for the parks” volunteers needed Leave a reply
  7. Happy Anniversary AAUNET! 12 Replies
  8. RMS Express Program at WB5SPA Club Meeting Leave a reply
  9. Technician Review and Testing Leave a reply