Global InformationT2FD antenna information
The Tilted Terminated Folded Dipole (T²FD, T2FD, or TTFD) or Balanced Termination, Folded Dipole (BTFD) - also known as W3HH antenna - is a general-purpose shortwave antenna developed in the late 1940s by the United States Navy.[1][2] It performs reasonably well over a broad frequency range, without marked dead spots in terms of either frequency, direction, or angle of radiation above the horizon.
Although inferior in terms of efficiency[3] (at least 30% of the RF power is lost as heat in the resistor [3][4]) to antennas specifically designed for given frequency bands, or optimized for directionality, its all-around performance, relatively modest size, low cost, and the fact that it does not require any complicated matching to operate with a standard shortwave transmitter, have made it popular in professional shortwave communications where ERP or gain are not a concern. One example would be clear channel low power HF communications.
- ^ Countryman, Gil L., W1RBK, (W3HH) (June 1949). "An experimental all-band nondirectional transmitting antenna". QST Magazine. p. 54.
{{cite magazine}}: CS1 maint: multiple names: authors list (link) CS1 maint: numeric names: authors list (link) - ^ Countryman, G.L., Capt., W3HH (November 1951). "Performance of the terminated folded dipole". CQ. p. 28.
{{cite magazine}}: CS1 maint: multiple names: authors list (link) CS1 maint: numeric names: authors list (link) - ^ a b Cebik, L.B., W4RNL. "Modeling the T2FD". Retrieved 27 December 2022 – via antentop.org.
{{cite web}}: CS1 maint: multiple names: authors list (link) CS1 maint: numeric names: authors list (link) - ^ Villemagne, Pierre (30 January 2006). Antennen für die unteren Bänder 160–30 m [Antennas for the lower bands 160–30 m] (in German). Translated by Jordan, Jürgen. Funk Technik-Berater. ISBN 978-388180356-4.
Technische Unterlagen für den Selbstbau in praxisnaher Darstellung [Practical technical documentation for self-assembly]