The radios are Yeasue FTM-300 and FT-6000. Using the Mini Dim 10 Audio and Serial cable (did not have this issue with MiniDim 10 Audio cable.)
Tested with both USB C and USB A cables.
To get a little control over the noise, I added ferrites to the USB cables, In Mic properties, set the level at 20, AGC off, and Enable Audio Enhancements to off.
But there is still too much noise. Does anyone else have this issue?
I have a Yaesu FTM-6000R which I use 2-10 times a week with the Digirig. I did not have this problem, after I built the following configuration.
I use a good power supply, the one recommended by my local HRO. Before I had a good PS, I used a battery when I did digital modes. The antenna is 10 ft away and 15 ft up, with a ferrite choke on the radio side of the leadline. My USB has a choke on the computer side of the cable. The Digirig audio cable has the built-in chokes.
I used a digirig USB line isolator for my Yaesu, and placed ferrites on the power cords to my televisions, which resolved a lot of RFI, but I still have more work to do.
I want to help but its very difficult to have a full understanding of the problem by text. Are you able to upload a video with audio?
I also dont want to overexplain, so please forgive me if I do; I mean no offense. You want your transceiver squelch to be completely off with digital comms software like FLDIGI, so hearing white noise is a good thing. If your squelch is tuned to eliminate background noise, then you are not unlocking the full potential of what your system is capable of. So you should see color on your FLDIGI waterfall at all times. The white noise should be nice and smooth, like listening to the ocean. If its coarse and crackly, then you might have RFI from other appliances in your home. Those RFI sources would need to be dealt with individually and directly rather than through software settings.
I see that the radios you are using are 2m/70cm transceivers. With VHF/UHF, I turn my squelch all the way off. Then on the FLDIGI waterfall settings toward the lower left of the main screen, I set those numbers to -20 (left) and 70 (right). The actual colors of the waterfall can be changed in the configuration menu. Then I adjust my transceiver volume until the incoming audio causes the meter at the bottom of the main screen to be about -20 dB. We want the diamond shaped indicator to the right of that meter to remain green.
I am assuming you are using windows based on your description of your computer’s audio settings. I like to right click on the numbers to the right of the sliders (20, in the example you gave) and convert that measurement to dB. Then I set all sliders as close to zero dB as possible. You are right to turn AGC and enhancements off.
For the attenuation setting toward the bottom right of the FLDIGI main screen, with FM modulation over VHF/UHF I just set that to zero. This type of setup is very resistant to transmit overdriving in my experience, even with JS8Call which is very sensitive to overdriving on HF.
I’ve attached a file of the sound. The break in the sound is where I unplugged the audio cable from the DigiRig.
This is stated from the record on the laptop before going into any software. The noise is so bad that MMSSTV can not decode a graphic.
I have also attached a jpg of what the waterfall looks like in FLDigi, and this is with the SQL on within Digirig
The sound is like a waterfall, not the ocean. On my radios when doing digital, I do not have any of this sound.
My setting in the lower left is -35, I tried at -20, and no noise change, but the waterfall gets cleaner.
Can you post screenshots of your full FLDIGI screen and your Windows sound menus?
Also, have you shut off various breakers on your home’s breaker panel to see if there are any improvements to your incoming sound?
The waterfall gain numbers of -20 and 70 wont change the audio, but it sets you up for proper adjustment of that incoming audio meter with the volume knob of your VHF/UHF radio.