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40m NVIS dipole measurements

40m NVIS dipole measurements by Victor Reijs is licensed under CC BY-NC-SA 4.0

Introduction

Measurements

A SSB call (from Lemelerveld) around 7.065MHz (depending on QRM, QRN or QSO) has been done with around 8?W@SWR=1.2 (according to ATU-100 EXT):

Location	Date Time [UTC]	SS	NS	foF2 [MHz]	hoF2 [km]	Elev [deg]	fxI [MHz]	hxI [km]	Elev [deg]	Wr@SWR@Freq	Dif. freq [MHz]
IJsselmuiden	2026-08-27 11:15	0	NA	8.35	270	87	9.1	270	87	8?@1.2@7.065	+2.04
Maasbree		4	NA			77			77
UTwente		1	NA			85			85
Dokkum		4	NA			79			79
Fordham		0	NA			51			51

** Coloring of fxI-Freq.:

3 or more nearby stations heard me, while TX Freq is higher than fxI
2 or 3 nearby stations heard me, while TX Freq is lower than fxI
1 or none nearby station heard me, while TX Freq is lower than fxI

*** SS is denoted as '-', when the received signal is well below (aka not noticed) the SDR noise (say SS<SN-1)

Acknowledgements

I would like to thank people, such as Hans Sandikn and others for their help, encouragement and/or constructive feedback. Any remaining errors in methodology or results are my responsibility of course!!! If you want to provide constructive feedback, please let me know.

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Major content related changes: Aug 27, 2026