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Because the AM broadcast band developed before technology suitable for directional antennas, there are numerous exceptions, such as the US use of 800 (kHz) and 900 non-directionally in Alaska, limited to 5 kW at night; and 1050 and 1220, directionally, in the continental US, and without time limits; each of these being assigned to specific ...
This is the type of antenna used in most portable AM broadcast receivers (other than car radios): The standard AM antenna is a loop of wire wound around a ferrite rod (a "loopstick antenna"). The loop is resonated by a coupled tuning capacitor, which is configured to match the receiver's tuning, in order to keep the antenna resonant at the ...
WTIC and KRLD were both designated as "Class I-B" clear channel stations, required to use directional antennas at night to mutually protect each other from interference. [13] In 1940, WTIC began experimenting with FM radio, putting W1XSO on the air on 43.2 MHz. It later became 96.5 WTIC-FM, mostly simulcasting the AM station in its early years ...
Quarter-wave whip antenna on an FM radio for 88–108 MHz. ... VHF ground plane antenna. Mast radiator antenna of medium wave AM radio station, Germany
Compared to FM or digital transmissions, AM transmissions are more expensive to transmit due to the necessity of having to transmit a high power carrier wave to overcome ground losses, and the large antenna radiators required at the low broadcast frequencies, but can be sent over long distances via the ionosphere at night; however, they are ...
The maximum ERP for US FM broadcasting is usually 100,000 watts (FM Zone II) or 50,000 watts (in the generally more densely populated Zones I and I-A), though exact restrictions vary depending on the class of license and the antenna height above average terrain (HAAT). [6]