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The HB9XBG antenna is based on the use of a speaker audio cable with a strand cross-section of 2 × 2.5 mm 2 and PVC insulation. A speaker cable of this kind has an impedance of almost exactly 100 Ω and performs two functions at the same time: the function of the feedline as far as the centre of the dipole and the function of the "radiating ...
The dipole elements are 15.55 metres (51.0 ft) and the impedance-matching symmetric feedline (ladder-line or twin-lead) can be either 300 Ω (8.84 metres or 29.0 feet) or 450 Ω (10.36 metres or 34.0 feet). [7]
As originally constituted, what is now CB radio was Class D of the Citizens' Radio Service. Classes A and B were in the UHF radio band and served a similar purpose as Class D while Class C was interspersed among the current CB channels and used for remote control of devices, usually model craft (aircraft, watercraft, or road vehicles).
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The top-to-top half-wave connecting wire serves as a phasing line that keeps radiation from the two antennas in-phase; even if the system feedpoint is connected elsewhere. Since a quarter-wave monopole's current is highest nearest its feedpoint, the nominal top-feed puts the maximum radiating current up high, at the top of each monopole.
A 'skoolie' is a former school bus or shuttle bus that has been converted into an RV. This includes full-size buses based on a dedicated school bus chassis, or a "short bus", based on a cutaway van, heavy duty pickup truck cutaway, or medium duty truck cutaway with a bus body attached. (A cutaway is where a vehicle frame is fitted with only a ...