Antennas 3+4 on 144/433 MHz

June

2024

антенны

28 June 2024 2:32

The antennas of the ranges are 144 and 433 MHz with a power of one cable.

In the early 2000s, I was fond of modeling antennas for 144 and 433 MHz "Open Sleeve"(The original idea belongs to the authors DK7ZB and Rz9cj). But then "Winchester disk" died from improper connection of the SATA adapter on Molex. The hard drive was able to restore only recently. Many antennas models have also become available, of which I selected the best. One option No. 1, presented below.

1) Antenna 3+4 pipe diameter 6mm (new calculation, June 2024)

element	R	D1	D2	A	D3	D4	D5
Position, MM	0	30	156	180	254	313	357
length, MM	1030	336	314	1018	314	928	300

KSV

Gain

Diagram of orientation

2) Antenna 3+4 pipe diameter 8mm (old antenna recalculation, June 2024)

element	R	D1	D2	D3	D4	D5
Position, MM	0	282	465	254	354	50	503
length, MM	1000	994	892	308	302	326	298

KSV

Gain

Diagram of orientation

3) Antenna 3+4 pipe diameter 8mm (old antenna, original calculation)

element	R	D1	D2	D3	D4	D5
Position, MM	0	41	248	386	223	323	446
length, MM	1018	330	1030	920	314	312	296

KSV

Gain

Diagram of orientation

DN in the range of 144 MHz in such antennas is the same

I do not recommend assembling the antenna on a metal crossbar - there is no way to properly take into account the boom correction. It is better to use a dielectric (pipe + plumbing clips), especially since the antenna is light and small in size.

Driven element A is split-dipole powered with a coaxial cable with a wave resistance of 50 Ohm.

Archive of models for the Mmana program:
34_ra1ahq.zip

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