Noise Power Ratio (NPR) metingen
- 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
EMI-RFI, Ferrieten en Common Mode Chokes
- KY9C Jim Brown:
- ON9CVD Bob van Donselaar
- ON4WW Mark Demeuleneere
- W2FMI Jerry Sevick (SK)
- G3TXQ SE Hunt (SK)
- W1HIS, Chuck Counselman
- W8JI, Charles T Rauch, Jr.
- IN3OTD
- Fair-Rite Products Corp.
- Ferroxcube
- Amidon Corp
- RSGB
- ARRL
- Old Timers Club
Propagatie
- Live stream van het 3.5555 MHz baken door Hans, PA0EHG
- Propagatie metingen in de 80m band; door Hans PA0EHG
- Metingen aan het 3.555 MHz test signaal; door Koos PA0KDF
- Radio communication via NVIS; Ben A. Witvliet en Rosa Ma Alsina-Pagès
- Calculating Ionospheric Doppler shifts; Lynn, K. J.W.
- Modern Methods for Calculating Ground-Wave Field Strength Over A Smooth Spherical Earth; Robert P. Eckert
- Handbook on Groundwave propagation; Radiocommunication Bureau
Doppler shift

- Dopplergrams; Peter Martinez G3PLX
- SBSpectrum; M Greenman ZL1BPU
- Intro HF propagation and Ionosphere; M Greenman ZL1BPU
Noise

- Presentatie over Noise (RF-Seminar 2016); Hans PA0EHG
Smith Charts

- Smith Charts; F. Caspers, CERN
- Cursus Smith Charts; Prof. C. Furse, Univ Utah
- Smith chart software; Prof. F. Dellsperger
- Pasan – Smith-chart software to solve impedance matching problems; Marien PA0MVW
Meetapparatuur
GPIB / HPIB / IEEE488 interface

- Raspberry Pi using Agilent 82357B
- Raspberry Pi using NI USB-GPIB-HS
- KE5FX GPIB Toolkit
- Gee Whiz, GPIB-to USB Converter Elektor jul/aug 2012
- Gee Whiz rev 2 PCB and software update
- Rudis wiki GPIB page
- GPIB IEEE488 Basics Tutorial
- HP Tutorial Description of HPIB bus (pdf)
- Prologix GPIB interfaces
