RW4HFN Limited Space Balcony Dipole Antennas

Second antenna was simulated with length in 4- meter, main vibrator was simulated from aluminum tube in diameter of 30- mm, gamma match simulated from aluminum tube in diameter of 14- mm. Distance between vibrator and gamma match is 10- cm.

Spiral loads may be made from aluminum or copper wire in 1- 2- mm diameter.

Antenna may be tuned in in usual way- with length of gamma match and capacitors (match the input impedance) and with length of the spiral load (tune to resonance).

MMANA file for the antenna you may download at:

http://www.antentop.org/023/RW4HFN_023.htm

Figure 17 shows SWR for the 3- m length antenna. Figure 18 shows SWR for the 4- m length antenna.

Figure 17 SWR of the Shortened 3- meter Length Dipole Antenna with Spiral Loads for the 40 meter Band

Figure 18 SWR of the Shortened 4- meter Length Dipole Antenna with Spiral Loads for the 40 meter Band

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