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TOPIC: Transmit audio settings for SUNSDR2PRO

Transmit audio settings for SUNSDR2PRO 18 Dec 2020 00:11 #1

SunSDR2Pro transmit audio settings (especially for AM mode) please?
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Transmit audio settings for SUNSDR2PRO 18 Dec 2020 10:35 #2

  • G3XLG
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There are a whole series of U tube presentations from Expert Electronics which are well worth watching.
The link below is to part of a presentation on audio settings but don't remember if it specifically deals with AM rather than SSB.

73 Ray G3XLG
go to ExpertSDR2. PROC menu - fine adjastments in U tube by RN6LHF
Last Edit: 18 Dec 2020 10:38 by G3XLG. Reason: added the link
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Transmit audio settings for SUNSDR2PRO 18 Dec 2020 12:53 #3

  • kc2rgw
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So many variables for audio settings. Your voice, your microphone, any other things in the chain. These make it very hard to share settings in a productive way.

Fundamentals
  • Transmit bandwidth - set that first as it determines the overall potential available to tune
  • Microphone level - before enabling anything set the level so that your peaks are close to 0 but not going over at all
  • Equalizer - It takes time and patience to achieve the sound you want. I typically tell people to high pass at 50-100 Hz and then start poking at 120-160Hz to drop that out, then the next harmonic at 200-400Hz. Dropping in those ranges will clear up your voice and make the articulation of higher frequencies more prominent.
  • Compressor - Experiment with a ratio of 2:1 or 4:1 range, drop the threshold until you hear the compressor increase the density of your voice
  • AGC and limiter - Will depend on how you speak into the microphone and will help maintain a consistent level and limit the peaks
  • Clipper - bring down the threshold slowly as your voice gets louder, but not until it sounds fuzzy or overdriven.

With AM I find that I remove more bottom end than SSB by a db or two as it seems that AM emphasizes the bottom end a bit more and it needs a bit more care to get it clean and balanced.

For AM I run 50-5000 pass band range for a total of 10 kHz wide. I don’t find audio response over 5kHz very useful, it’s about the practical limit given signal strength and typical noise floor on the band, much higher gets lost and is just wasted energy to transmit.
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Transmit audio settings for SUNSDR2PRO 18 Dec 2020 14:26 #4

  • R3IIN
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kc2rgw wrote:
So many variables for audio settings. Your voice, your microphone, any other things in the chain. These make it very hard to share settings in a productive way.

Fundamentals
  • Transmit bandwidth - set that first as it determines the overall potential available to tune
  • Microphone level - before enabling anything set the level so that your peaks are close to 0 but not going over at all
  • Equalizer - It takes time and patience to achieve the sound you want. I typically tell people to high pass at 50-100 Hz and then start poking at 120-160Hz to drop that out, then the next harmonic at 200-400Hz. Dropping in those ranges will clear up your voice and make the articulation of higher frequencies more prominent.
  • Compressor - Experiment with a ratio of 2:1 or 4:1 range, drop the threshold until you hear the compressor increase the density of your voice
  • AGC and limiter - Will depend on how you speak into the microphone and will help maintain a consistent level and limit the peaks
  • Clipper - bring down the threshold slowly as your voice gets louder, but not until it sounds fuzzy or overdriven.

With AM I find that I remove more bottom end than SSB by a db or two as it seems that AM emphasizes the bottom end a bit more and it needs a bit more care to get it clean and balanced.

For AM I run 50-5000 pass band range for a total of 10 kHz wide. I don’t find audio response over 5kHz very useful, it’s about the practical limit given signal strength and typical noise floor on the band, much higher gets lost and is just wasted energy to transmit.
according to the manufacturer (it was Vasily), the Mic Level indicator works in RMS measurement mode and not PEAK so that the values at 0dB peaks will not be peak , the PEAK value will be greater!!!
P.S. I would like to have both the RMS and PEAK level display at the same time
Last Edit: 18 Dec 2020 14:43 by R3IIN.
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Transmit audio settings for SUNSDR2PRO 23 Mar 2021 22:11 #5

  • urbancamo
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I watched Vasily's excellent youtube video presentation and followed it.
What is clear when you start making changes is that you will need to follow what is being presented as a template, but settings need to be tailored for your voice and microphone.
I found that I have quite a flat voice at higher frequencies, and in order for my callsign to be transmitted clearly I had to boost higher frequencies quite significantly compared to the settings that Vasily ended up with.

It is definitely worth spending the time getting the settings correct. You wouldn't believe how many stations that I call give me unsolicited comments on good audio quality.
If you need a separate profile for AM I think that is possible, by switching between profiles.

Regards, Mark.
Last Edit: 23 Mar 2021 22:12 by urbancamo.
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