HomeHomeUpUpSearchSearchE-mailMail
NEW

40m NVIS G5RV junior measurements

40m NVIS G5RV junior measurements by Victor Reijs is licensed under CC BY-NC-SA 4.0

Introduction

Measurements

A CW Tune around 7.01MHz (depending on QRM/QRN/QSO) has been done with around 8Wr@SWR=1.4 (according to APX125B ATU) or 5.5Wr@SWR=1.2* (ATU-100 EXT):
Location
 Date Time [UTC]
 SS
***
 		NS
 foF2
[MHz]
 hoFreq
[km]
 ElevF2
[deg]
 fxI
[MHz]
 hxFreq
[km]
 ElevI
[deg]
 Wr@SWR@Freq*
 **fxI-Freq
[MHz]
IJsselmuiden 2026-08-28 15:25
 6
 3
 6.95
 -
 -
 7.65
 350
 88
 8@1.4@7.015 +0.63
Maasbree
8
 5

-

80

UTwente
7
 5

-

86

IJsselmuiden 2026-08-28 16:35 7
 3
 7.5
 350
 88
 8.25
 300
 87
 8@1.3@7.015 +1.24
Maasbree
8
 6

80

78

UTwente
8
 5

86

86

IJsselstein 2026-08-28 17:55 7
 3
 7.35
 440
 88
 8
 370
 88
 8@1.4@7.015 +0.98
Maasbree
9
 5

82

80

UTwente
8
 5

87

87

IJsselmuiden 2026-08-28 21:45 5
 3
 6.55
 -
 -
 7.3
 450
 88
 8@1.4@7.014 +0.28
Maasbree
7
 5

-

82

UTwente
6
 4

-

87

IJsselmuiden 2026-08-28 22:20 3
 3
 6.4
 -
 -
 7.2
 500
 88
 8@1.4@7.014 +0.18
Maasbree
6
 4

-

83

UTwente
5
 4

-

88

IJsselmuiden 2026-08-28 23:00 -
 3
 6.05
 -
 -
 6.7
 -
 -
 8@1.4@7.014 -0.31
Maasbree
6
 5

-

-

UTwente
6
 5

-

-

IJsselstein 2026-08-29 06:40 -
 4
 4.45
 -
 -
 5.1
 -
 -
 8@1.4@7.014 -1.91
Maasbree
4
 3

-

-

UTwente
4
 4

-

-

IJsselmuiden 2026-08-29 07:40 -
 4
 5.05
 -
 -
 5.85
 -
 -
 8@1.4@7.014 -1.17
Maasbree
4
 3

-

-

UTwente
-
 3







IJsselstein 2026-08-29 08:25 -
 3
 5.2
 -
 -
 5.9
 -
 -
 8@1.4@7.015 -1.12
Maasbree
-
 3

-

-

UTwente
-
 4

-

-

IJsselmuiden 2026-08-29 09:45 -
 3
 5.5
 -
 -
 6
 -
 -
 8@1.4@7.015 -1.01
Maasbree
-
 3

-

-

UTwente
-
 3

-

-

Fordham
3
 1

-

-

IJsselmuiden 2026-08-29 15:35
 -
 3
 5.7
 -
 -
 6.4
 -
 -
 8@1.4@7.014 -0.61
Maasbree
4
 4

-

-

UTwente
4
 4

-

-

Dokkum
-
 4

-

-

Fordham
1
 1

-

-

IJsselmuiden 2026-08-29 17:30 -
 4
 5.65
 -
 -
 6.35
 -
 -
 8@1.4@7.011 -0.66
Maasbree
5
 4

-

-

UTwente
5
 4

-

-

Dokkum
-
 4

-

-

IJsselmuiden 2026-08-30 11:05 5
 2
 7.35
 350
 88
 8.1
 320
 87
 5.5@1.2@7.013* +1.08
Maasbree
9
 3

80

79

UTwente
6
 3

86

86

Dokkum
5
 4

82

81

Fordham
2
 1

58

56

IJsselmuiden 2026-08-29 20:55 4
 3
 5.3
 -
 -
 6.05
 -
 -
 8@1.4@7.010 -0.97
Maasbree
6
 4

-

-

UTwente
5
 4

-

-

Dokkum
4
 4

-

-

IJsselmuiden 2026-08-30 09:25 7
 2
 7.2
 420
 88
 8
 330
 87
 5.5@1.2@7.013* +0.98
Maasbree
8
 3

82

79

UTwente
7
 4

87

86

Dokkum
4
 3

83

81

Fordham
4
 1

63

57

IJsselmuiden 2026-08-30 12:25 5
 2
 7.35
 340

 87
 8.1
 320
 87
 5.5@1.2@7.013* +1.08
Maasbree
9
 3

80

79

UTwente
7
 4

86

86

Dokkum
5
 3

82

81

Fordham
5
 4

58

56

IJsselmuiden 2026-08-30 15:15 5
 3
 6.6
 -
 -
 7.3
 370

 88
 5.5@1.2@7.013* +0.29
Maasbree
8
 3

-

80

UTwente
6
 3

-

87

Dokkum
5
 2

-

82

IJsselmuiden 2026-08-30 17:20 5
 3
 6.85
 -
 -
 7.6
 360
 88
 5.5@1.2@7.013* +0.59
Maasbree
10
 4

-

80

UTwente
8
 4

-

87

Dokkum
5
 3

-

82

Fordham
3
 1

-

56

IJsselmuiden 2026-08-30 20:30 8
 3
 7.35

 350
 88
 8.15

 300
 87
 5.5@1.2@7.013* +1.14
Maasbree
10
 5

80

78

UTwente
8
 4

86

86

Dokkum
7
 3

82

80

Fordham
5
 1

58

54

IJsselmuiden 2026-08-30 21:50 3
 2
 5.6
 -
 -
 6.35
 -
 -
 5.5@1.2@7.013* -0.66
Maasbree
5
 4

-

-

UTwente
5
 4

-

-

Dokkum
3
 3

-

-

Fordham
1
 1

-

-

IJsselmuiden 2026-08-30 22:30 -
 2
 4.6
 -
 -
 5.3
 -
 -
 5.5@1.2@7.014* -1.71
Maasbree
4
 4

-

-

UTwente
4
 4

-

-

Dokkum
-
 3

-

-

Fordham
-
 1

-

-

IJsselmuiden 2026-08-30 23:10 -
 2
 4.15
 -
 -
 5.05
 -
 -
 5.5@1.2@7.014* -1.96
Maasbree
4
 4

-

-

UTwente
4
 4

-

-

Dokkum
-
 3

-

-

IJsselmuiden 2026-08-31 06:55 -
 3
 5.15
 -
 -
 5.75
 -
 -
 5.5@1.2@7.014* -1.26
Maasbree
4
 3

-

-

UTwente
-
 4

-

-

Dokkum
-
 3

-

-

IJsselmuiden 2026-08-31 09:25 5
 3
 6.85
 -
 -
 7.55
 320
 87
 5.5@1.2@7.014* +0.54
Maasbree
8
 3

-

79

UTwente
7
 4

-

86

Dokkum
5
 4

-

81

Fordham
4
 1

-

56

IJsselmuiden 2026-08-31 10:55 5
 3
 6.85
 -
 -
 7.5
 380
 88
 5.5@1.2@7.014* +0.49
Maasbree
7
 3

-

81

UTwente
6
 4

-

87

Dokkum
5
 3

-

82

IJsselmuiden 2026-08-31 12:50 5
 3
 7.4
 330
 87
 8.2
 310
 87
 5.5@1.2@7.014* +1.19
Maasbree
8
 4

79

79

UTwente
7
 4

86

86

Dokkum
5
 3

81

81

IJsselmuiden 2026-08-31 15:50 5
 3
 6.75
 -
 -
 7.5
 330
 87
 5.5@1.2@7.014* +0.49
Maasbree
8
 5

-

79

UTwente
6
 5

-

86

Dokkum
5
 3

-

81

IJsselmuiden 2026-08-31 17:30 7
 3
 7.2
 380
 88
 7.9
 290
 87
 5.5@1.2@7.004* +0.9
Maasbree
8
 5

81

78

UTwente
8
 5

87

86

Dokkum
7
 3

82

80

IJsselmuiden 2026-08-31 20:45 7
 3
 6.7
 -
 -
 7.5
 330
 87
 5.5@1.2@7.004* +0.5
Maasbree
9
 5

-

79

UTwente
8
 5

-

86

Dokkum
7
 3

-

81

IJsselmuiden 2026-08-31 21:45 3
 3
 4.65
 -
 -
 5.6
 -
 -
 5.8@1.1@7.004* -1.4
Maasbree
5
 4

-

-

UTwente
-
 4

-

-

Dokkum
-
 3

-

-

IJsselmuiden 2026-08-31 22:30 3
 3
 3.95
 -
 -
 5
 -
 -
 5.8@1.1@7.004* -2.0
Maasbree
4
 4

-

-

UTwente
5
 5

-

-

Dokkum
-
 3

-

-

IJsselmuiden 2026-08-31 23:25 3
 3
 4.25
 -
 -
 4.85
 -
 -
 5.8@1.1@7.004* -2.15
Maasbree
4
 4

-

-

UTwente
-
 5

-

-

Dokkum
-
 3

-

-

IJsselmuiden 2026-09-01 00:05 3
 3
 3.75
 -
 -
 4.25
 -
 -
 5.8@1.1@7.004* -2.75
Maasbree
4
 4

-

-

UTwente
-
 5

-

-

Dokkum
-
 3

-

-

IJsselmuiden 2026-09-01 05:20 -
 3
 4.45
 -
 -
 5.35
 -
 -
 5.8@1.1@7.004* -1.65
Maasbree
4
 4

-

-

UTwente
-
 3

-

-

Dokkum
-
 3

-

-

Fordham
-
 1

-

-

IJsselmuiden 2026-09-01 06:30 -
 4
 5.2
 -
 -
 5.9
 -
 -
 5.8@1.1@7.004* -1.1
Maasbree
4
 3

-

-

UTwente
4
 5

-

-

Dokkum
-
 3

-

-

Fordham
-
 1

-

-

IJsselmuiden 2026-09-01 07:25 4
 3
 5.55
 -
 -
 6.25
 -
 -
 5.8@1.1@7.004* -0.75
Maasbree
4
 3







UTwente
4
 4







Dokkum
-
 3







Fordham
-
 1







IJsselmuiden 2026-09-01 08:25 3
 3
 5.8
 -
 -
 6.55
 -
 -
 5.8@1.1@7.004* -0.45
Maasbree
4
 3







UTwente
-
 7







Dokkum
-
 3







Fordham
2
 1







IJsselmuiden 2026-09-01 11:25 4
 3
 6.4
 -
 -
 7.05
 500
 88
 5.8@1.1@7.004* +0.05
Maasbree
6
 3




83

UTwente
-
 7




88

Dokkum
5
 3




84

Fordham
3
 1




67

IJsselmuiden 2026-09-01 12:45 5
 3
 6.85
 -
 -
 7.6
 340
 87
 5.8@1.1@7.004* +0.59
Maasbree
7
 3




80

UTwente
7
 7




86

Dokkum
6
 3




82

Fordham
3
 1




58

IJsselmuiden 2026-09-01 13:25 5
 3
 6.65
 -
 -
 7.4
 350
 88
 5.8@1.1@7.004* +0.4
Maasbree
7
 3




80

UTwente
7
 7




86

Dokkum
4
 3




82

Fordham
3
 1




58






















































































** Coloring of fxI-Freq.:

*** 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   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.
Disclaimer and Copyright
HomeHomeUpUpSearchSearchE-mailMail
Major content related changes: Aug 27, 2026