ABB Astronomical Twilight Switches TWA-1

Specifications
Electrical
Model TWA 1
Frequency 100 kHz – 30 MHz
Type Broadband matching transformer for marine wire receiving antennas
Output Impedance Nom. 50Ω
Mechanical
Min. Length Of Wire Ant. 5 MHz
Max. Length Of Wire Ant. 10 m / 393.70 in.
Antenna Connection M8 thread stud
Connection(s) N(f)
Materials Clamps : Stainless steel
Housing: Polycarbonate
Earth Connection M6 thread stud
Colour Light-grey
Width 95 mm / 3.74 in.
Height 100 mm / 3.94 in.
Weight Approx. 0.45 kg / 0.99 lb.
Mounting On vertical or horizontal mast tubes 30 – 54 mm in outer dia.
Depth 38 mm / 1.50 in.
Environmental
Operating temperature range -30 °C to +70 °C