¿ªÔÆÌåÓý

  1. BITX20
  2. Topics

PSK31 overdriving audio on sBitx v3

 

I recently tried my hand at PSK31 on my new sBitx v3 with 64 bit software. Keep in mind, anything having to do with the digital modes is *very* new to me.
?
I received an email from someone who listened in on one of my PSK QSOs and he said I might want to turn down the audio from the PC into the radio because I am overmodulating. He sent the following screen shot.
?
?
This was on 20m. Drive set to 100. However, I don't know how to do what he's suggesting. Is it as simple as turning down the MIC gain in sBitx? Any suggestions would be greatly appreciated.
?
Aaron
N0MLZ
 

Yes on fldigi psk31 I have to turn the audio drive/attenuator from -3.0 to -28.0 on most modes. ?Look at the bottm right of your fldigi screen
?
ryan
kk6dzb
 

¿ªÔÆÌåÓý

Interestingly we have to do similarly even with icom7300 with normal USB-digital input sensitivity (about 50 on icom¡¯s scale)

I have to teach this to our winter field day team each year

Gordon kx4z?



On Jan 31, 2025, at 20:17, Ryan Wesolowski via groups.io <cosmo1stgen@...> wrote:

?
Yes on fldigi psk31 I have to turn the audio drive/attenuator from -3.0 to -28.0 on most modes. ?Look at the bottm right of your fldigi screen
?
ryan
kk6dzb
 

You might want to dial back the drive for any continuous signal digital mode like FT8 and PSK31. For both life of your? RF finals and signal clarity. The good news is that they? are very efficient, so usually don't need much power to function well.
--
73
??? Bob? KD8CGH
 

Thanks for all the suggestions. Until about a month ago I was an inactive Ham for about 20 years. Learning the variety of digital modes has been a bit of a learning curve.
?
Aaron
N0MLZ
 

On Feb 1, 2025, at 02:17, Ryan Wesolowski via groups.io <cosmo1stgen@...> wrote:

Yes on fldigi psk31 I have to turn the audio drive/attenuator from -3.0 to -28.0 on most modes. Look at the bottm right of your fldigi screen
Indeed I¡¯ve embarrassed myself several times by overdriving, because fldigi doesn¡¯t remember these attenuation settings by default, and it takes so long to adjust it, having to hit the left-double-arrow button a lot of times to adjust by 1dB increments. The JT-type programs have a vertical slider at the lower-right corner to quickly adjust output level (seems like better usability to me), whereas fldigi puts the squelch control there. (Well, squelch is also important, but it just helps you avoid noise getting decoded as garbage.)



But yesterday I finally found this setting: if you save ¡°Transmit level control¡± on a per-mode basis, then it will remember where you set this attenuator control, so when you start the program again it¡¯s where you left it (but you might have -28dB for one mode and -29dB for another).

fldigi-attenuation.png
fldigi-config-save-params.png

 

I have the opposite problem. If I set the DRIVE to 63 so I get 10 W out, but fldigi and wsjtx output only 1.3 W when the sliders are all the way to maximum. I can't find a setting parameter that cranks up the gain in either program. I rather suspect that both are putting out max audio and the problem is elsewhere.

--?
ww6x


On Tue, Feb 4, 2025, at 12:14 AM, Shawn Rutledge K7IHZ / LB2JK wrote:
> On Feb 1, 2025, at 02:17, Ryan Wesolowski via groups.io <cosmo1stgen=[email protected]> wrote:
>?
> Yes on fldigi psk31 I have to turn the audio drive/attenuator from -3.0 to -28.0 on most modes.? Look at the bottm right of your fldigi screen

Indeed I¡¯ve embarrassed myself several times by overdriving, because fldigi doesn¡¯t remember these attenuation settings by default, and it takes so long to adjust it, having to hit the left-double-arrow button a lot of times to adjust by 1dB increments.? The JT-type programs have a vertical slider at the lower-right corner to quickly adjust output level (seems like better usability to me), whereas fldigi puts the squelch control there.? (Well, squelch is also important, but it just helps you avoid noise getting decoded as garbage.)
 

On Thu, Feb 6, 2025 at 11:54 PM, ww6x wrote:
I have the opposite problem. If I set the DRIVE to 63 so I get 10 W out, but fldigi and wsjtx output only 1.3 W when the sliders are all the way to maximum. I can't find a setting parameter that cranks up the gain in either program. I rather suspect that both are putting out max audio and the problem is elsewhere.
Are you using sbitx in USB or DIGI mode?
--
Gyula HA3HZ
 

I am using DIGITAL. Could you please explain why that might make a difference?

--?
ww6x

On Fri, Feb 7, 2025, at 1:24 AM, HA3HZ wrote:
On Thu, Feb 6, 2025 at 11:54 PM, ww6x wrote:
I have the opposite problem. If I set the DRIVE to 63 so I get 10 W out, but fldigi and wsjtx output only 1.3 W when the sliders are all the way to maximum. I can't find a setting parameter that cranks up the gain in either program. I rather suspect that both are putting out max audio and the problem is elsewhere.
Are you using sbitx in USB or DIGI mode?

1 - 9 of 9