Noise level

[aa4pg offline]

The board is great. However, my noise level is around S9 using a 64-bit Asus laptop with the board in a grounded minibox and the usb and audio cables run through a couple of toroids. The noise level on a Drake 2B sitting next to it is about S3. I have read that laptops tend to be noisy but the one you were using at Shelby seemed fine. Any suggestions?
Thanks,
Pat, AA4PG Birmingham

[Ke4ekx offline]

The s meter on the sdr may be fooling you because it is based on the audio gain in the windows microphone mixer. Usually there is a 20db boost selected in the advanced settings. If you adjust the mixer for the channel going to the sdr, usually the audio out, or WAV, you should slide the slider down until the s meter is correct. Compare it to the drake receiver. What you should see is that the difference between the noise floor and the peak signal reading is representative of the S meter. Start by turning all mixer sliders to half way and then re-compare.

Sam

[aa4pg offline]

That did it. Thanks,
Pat

[KTD4569 offline]

Thanks from me also Sam and Pat. This was on my list of things to address and now I know the solution.

Garrison KTD4569