CW sidebands

  • 1
  • Question
  • Updated 4 years ago
  • Answered
When keying the Flex 6500 transmitter with a key plugged into the 6500, is it normal to see on the panadapter not only a peak at the selected transmit frequency but also side lobes at about plus/minus 6 kHz from the main peak, attenuated by something like 40 dB?
Photo of Les Brown

Les Brown

  • 21 Posts
  • 0 Reply Likes

Posted 4 years ago

  • 1
Photo of K1FR

K1FR

  • 111 Posts
  • 9 Reply Likes
Les:  On my 6700 they are more like 80 db down from the peak.   73, Tom K1FR
Photo of Tim - W4TME

Tim - W4TME, Customer Experience Manager

  • 9198 Posts
  • 3558 Reply Likes
Official Response
Yes, what you are describing is normal.
Photo of Les Brown

Les Brown

  • 21 Posts
  • 0 Reply Likes

Tim,

   Thanks for the quick response. My next question is somewhat delayed because I was in Korea last week.

   What is the cause of the sidebands at about plus/minus 6 kHz from the main carrier? Does it represent an actual transmitted signal or is it a receiver anomaly?

Les, VE3ABN

Photo of Tim - W4TME

Tim - W4TME, Customer Experience Manager

  • 9198 Posts
  • 3558 Reply Likes
They are artifacts from receiving the transmitted signal internally in the radio.  They are NOT transmitted as RF, hence my characterization as being artifacts.