Author Topic: Audio Artifacts/Crackling Sound  (Read 2758 times)


  • Newbie
  • *
  • Posts: 7
    • View Profile
    • Email
Audio Artifacts/Crackling Sound
« on: 2019-11-08, 15:10:16 »
On strong signals (which all of them seem to be in contests) the audio from the SP jack on the front of my client box makes crackling sounds in my headphones. 

I have set the server box setting for Radio>"Codec inp attenuation" to both NO and YES. The crackling is there with either setting.

I have set the client box setting for Radio>"Codec out gain" at 255 and 220.  At 220 the audio is lower, but I increase the radio volume to compensate.  The crackling is there with either setting.

Is there another setting that might impact the received audio?

John K1ESE


  • Hero Member
  • *****
  • Posts: 2223
    • View Profile
    • DJ0QN / K7DX
    • Email
Re: Audio Artifacts/Crackling Sound
« Reply #1 on: 2019-11-12, 20:12:06 »
Hi John,

Try the following:

Play around with these 3 until you are satisfied:
- increase rx jitter buffer to min 12+
- increase rx jitter delay to min 10+
- audio packet size 20 or 40

Other possibilities that may help:
- audio quality to 0 (half the bandwidth of codec 2 and more than adequate for SSB & CW)
- set RTP to continuous

Mitch DJ0QN / K7DX