Ground Plane for the 40,-30,-20 and 17- meter

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ANTENTOP- 01- 2012, # 016

Ground Plane for the 40,-30,-20 and 17- meter Bands

Antenna may tune in the resonance by length of the radials and changing inductance of the inductors (by squeeze/stretch). Table 2 shows data for the antenna measured by MFJ- 259-B. There are shown data for two antenna locations at the roof. "Variant 1"shows data for initial installation of the antenna. Then antenna for some reason was relocated to other place. "Variant 2" shows the data for the other installation of the antenna.

The places were almost equal to each other. The difference is in the length of the coaxial cable going from my transceiver to the antenna. Length of the cable at "Variant 1" was 18- meter. Length of the cable at "Variant 2" was 40.6- meter.

References

http://www.dl2kq.de/ant/3-3.htm
http://www.antentop.org/ua1dz.htm

Table 2 Data for Two Variants of Installation of the Ground Plane Antenna

*Variant 1*					*Variant 2*
F, MHz	SWR	R		X	F, MHz	SWR	R	X

18.200	1.1		52	7	18.170	1.0	49	3
18.068	1.2		58	8	18.068	1.1	56	4

14.100	1.1		44	3	14.110	1.0	50	4
14.000	1.2		46	8	14.000	1.2	56	7
14.200	1.2		41	0	14.200	1.1	46	6
14.300	1.3		36	0	14.300	1.3	44	11
14.370	1.5		33	0	14.350	1.3	44	14

10.110	1.0		49	3	10.100	1.1	46	7
1.150	1.1		46	4	10.150	1.1	45	4

7.000	1.1		49	6	7.000	1.2	41	6
7.100	1.1		45	4	7.100	1.0	50	1
7.200	1.4		37	8	7.200	1.3	62	7

Capacitors K15U-1

Ground Plane. Box with matching circuits

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Last Updated:

January 19, 2020 12:47