NEC-LIST: Re: wide band dipole

Hi,

Just build the very small but broadband dipole as suggested by Ian Roberts,
but with a few differences: it now is a vertical two element monopole above
a conducting ground plane and with a working frequency from 137 tot 150 MHz
(SWR<2.0, for satellite comm's), so a simple 52 centimeter quarter
wavelength vertical with a 13 MHz VSWR<2.0 bandwidth would not do this job.
However with a somewhat smaller (42 cm) gronded monopole spaced
approximately 15 mm next to it, it does a good job having measured its
VSWR<2.0 bandwidth as being as large as 30 MHz (138 to 168 MHz with an HP
VNA).

Here's the NEC file I used, you can use it for the construction details.

CM NEC Input File of "Wide Band 144 MHz Dipole"
CM by Roger Bunney
CE 2 elements vertical over ground
GW 1 11 0.0 0.0 0.0 0.0 0.0 0.52
0.003
GW 2 9 0.01 0.0 0.0 0.01 0.0 0.39
0.003
GE 1
EX 0 1 1 0 1.0 0.0
GN 1
FR 0 1 0 0 149.0 0.0
EN

Regards,

Waldemar

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