My loop antenna

Technical specifications

Efficiency at 14 Mhz (-0,1 dB < 100%)
Antenna bandwidth: 93,8 kHz
Tuning capacity: 17 pF
Power p.e.p: 2 Kw
Empty condenser voltage: 25 Kv RMS
Radiation resistance: 2,18 Ω
Resistance loss: 0,041 Ω
Resonant circulating current: 77,9 A
Inductance: 7,52 uH
Inductive reactance: 662 Ω
Quality Factor (Q): 1003
Distributed capacitance: 19 pF
Octagon length: 7,1 m
Side length: 0,888 m
Antenna diameter: 2,1 m

Construction photos

Vacuum capacitor 25 Kv from 5 to 100 pf

Starting gamma match setup

Gamma match bar clamping

Gamma match bar connection to SO39 base connector

Side view of the internal reinforcement for the support of the lower part of the antenna

View of the vacuum capacitor tuning gear motor

View of the connection cable of the 4 to 12 V power supply of the tuning motor

Side view of the internal reinforcement for the support of the lower part of the antenna

View of the vacuum capacitor tuning gear motor

View of the connection cable of the 4 to 12 V power supply of the tuning motor

Starting to wire the tuning motor

Felipe and Ramon mounting the antenna

Felipe and Ramon holding the winds of the antenna (mastrant 4 mm Ø)

Ramon installing gamma shorting bar

View of the rotor (Tait Twister) and crank for raising and lowering the antenna mast

View of the installed loop antenna

Loop antenna for 20, 30, 40 meters and its builder, Felipe