- NPR Rauschgenerator; NPR-Meßplatz; NPR – Q-Notch 40m-CW(B=700Hz@-100dB), (c) Ing. Kurt Hoffelner OE3HKL.COM
- Noise Power Ratio (NPR) Testing of HF Receivers, (c) Adam Farson VA7OJ/AB4OJ
- Tutorial Noise Power Ratio (NPR), Walt Kester, (c) Analog Devices MT-005
- Noise Power Ratio (NPR) metingen, Robert PA0RYL, (c) Electron jun-2017
- NPR und Rauschbandbreite, Werner Schnorrenberg, DC4KU, CQ DL 10-2020
- NPR and noise bandwidth, Werner Schnorrenberg – DC4KU dc4ku.darc.de August 11, 2020
- SDG6022X-Test, DC4KU, Werner Schnorrenberg, dc4ku.darc.de, Jan 22, 2020
