FreeDV power output

  • 2
  • Problem
  • Updated 3 years ago
  • Not a Problem
I was trying FreeDV on HF (20m and 15m) yesterday and the power output is very low regardless of the Power output that I select on SmartSDR.
Max power I get out of the radio is 25w.
I then checked AM and on 20m all I get is 16w.
On FM I get full 100w. Also get full power on DStar.

The voltage draw from the radio is also lower so it is like the software is using a governor.


I checked with a couple of 6xxx owners and they are also experiencing the same issue.

Thanks in advance for the help.
Photo of EA4GLI - 8P9EH - Salvador

EA4GLI - 8P9EH - Salvador

  • 1770 Posts
  • 541 Reply Likes

Posted 3 years ago

  • 2
Photo of Tim - W4TME

Tim - W4TME, Customer Experience Manager

  • 9153 Posts
  • 3497 Reply Likes
Official Response
Your radio is not broken.  For proper operation of FreeDV, you drive your transmitter to an average power of about 20% of it's PEP power. You do this because there is a 8-12 dB peak-to-average power ratio in the FreeDV HF modem. Over-driving will reduce the received S/N so we limit the power output in software.