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Topic: T2FD

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	T2FD, The Forgotten Antenna -- antenna special on hard-core-dx.com
		However, the T2FD performs well in a modest amount of space, while a rhombic antenna can be immense virtually impractical at all but the highest SWBC bands.
		The T2FD has a characteristic 5 or 6 to l frequency ratio, which means that it works effectively from its lowend design frequency up to 5 or 6 times that frequency.
		The WRTH Newsletter in 1988 said that the wire for a T2FD must be made of pure copper between 3mm and 5mm thick In reality, the exact tbickness and type of wire have very little bearing on the T2FDs performance for receiving.
	www.hard-core-dx.com /nordicdx/antenna/wire/t2fd.html (0 words)

	John Conover: Terminated Tilted Folded Dipole Shortwave Antenna
		The impedance of the T2FD antenna was measured, (through a connection of 5 feet of RG58 using a Palomar noise bridge,) at 0.25 MHz.
		Remember though that the T2FD outperforms the dipole when the receiver is tuned outside the limited frequency range of the tuned dipole.
		T2FD - The Forgotten Antenna has additional historical information on tests run by the US Navy in the late 1940's.
	www.johncon.com /john/T2fd (0 words)

	Modeling the T2FD
		The original T2FD was intended for use as a vertical or a sloping antenna, often as an appendage to the tall tower.
		One common recommendation for the T2FD is to use a 390-Ohm resistor for the termination and to employ 300-Ohm feedline.
		A T2FD (this time in the narrow configuration) of 40' overall length and 0.25' width, using the same loading resistor and feedpoint standard impedance was modeled.
	www.cebik.com /wire/t2fd.html (0 words)

	Reference.com/Encyclopedia/T2FD Antenna
		The T2FD Dipole) is a general-purpose shortwave antenna developed in the late 1940s by the United States Navy.
		Although (in strictly electrical terms) measurably inferior 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 complex electronic matching to operate with a standard shortwave transmitter, have made it popular in professional shortwave communications.
		The T2FD is useful for hidden indoor systems, or where several optimised frequency-specific antennae cannot be accommodated.
	www.reference.com /browse/wiki/T2FD_Antenna (603 words)

	UMB T2FD Antenna Receiving Balun from Wellbrook Communications
		Universal Magnetic Balun UMB T2FD is a Receiving Antenna Balun with a 9:1 impedance ratio, and an integral 500 Ohm 5W Thick Film termination resistor.
		This reduces Mains Borne Noise such as TVs, etc. The T2FD solves the problem of providing the antenna/feeder impedance match outside the local interference zone so that the feed to the receiver is free from interference.
		WARNING: The UMB T2FD must not be used with a transmitter or a transceiver.
	www.wellbrook.uk.com /UMBT2FD.html (0 words)

	Terminated Folded Dipole
		The noise was rarely audible on the T2FD, yet signal strengths were comparable to (or better than) the other antennas in use, on a range of frequencies:
		The 500 ft. and 50 ft. antennas were switched in and out of the receiver's high impedance input, the T2FD fed the 50 ohm coax input.
		As the results show, the T2FD antenna did not begin to drop off in performance until down in the 120 meterband.
	www.tuberadio.com /tfd.html (999 words)

	Antenna Advice/Passive Antennas - Radio Netherlands Worldwide - Independent thinking, independent voice - English
		The G5RV antenna is a variant of the dipole and uses a specific length of 300- or 450-ohm twinlead and 50-ohm coaxial cable as the feedline to achieve a reasonable impedance match across the 3 to 30 MHz spectrum.
		The fan dipole is simply multiple ¼-wavelength elements, one pair for each frequency range desired, connected to a common feedline; the wire elements are spread out in opposing directions as a woman's fan.
		The T2FD (Terminated Tilted Folded Dipole) antenna is a sloped two-wire antenna that achieves a wide 1:5 frequency coverage; the formula to calculate its length in meters at the lowest design frequency is 100/MHz.
	www.radionetherlands.nl /features/media/practical/passive.html (1039 words)

	RF Systems T2FD Travelling wave antenna
		This means that the antenna is not as sensitive to annoying man made interference sources such as fluorescent lights, dimmers, televisions, etc. The antenna is also less prone to noise from natural sources, due to static.
		By ensuring a constant impedance though out the length of the antenna, (the T2FD is a travelling wave antenna), the T2FD is also less prone to distortion due to multipath fading.
		Thanks the development of a special frequency-compensating 11:1 transformer, the antenna is perfectly matched to the 50 ohm coaxial cable and the input of most communications receivers.
	www.universal-radio.com /catalog/sw_ant/0562.html (0 words)

	WBM, The Wideband Monopole (Site not responding. Last check: )
		This is a wideband, non-resonance and small-size grounded antenna using half section of T2FD (Tilted Terminated Folded Dipole).
		The original T2FD is shown in Fig.1, where the antenna is considered to be located on free-space.
		The original T2FD is reconstructed by imaging effect of the ground, and this is the theoretical basis of the wideband monopole (WBM).
	homepage3.nifty.com /jh5esm/handmade/widebandmonopole.html (395 words)

	T2FD
		The T2FD (tilted, terminated, folded dipole) is a general-purpose shortwave antenna developed in the late 1940s by the United States Navy.
		Since the late 1980s also amateur radio operators and hobby shortwave listeners have become aware of its qualities.
		A typical T2FD is built as follows, out of wire conductors:
	www.teachersparadise.com /ency/en/wikipedia/t/t2/t2fd.html (409 words)

	T2FD
		The RF Systems' T2FD receiving antenna is designed around a special matching transformer with frequency compensation.
		Although the T2FD is in use at naval- and airfield stations as transmitting/receiving antenna, we do not advice the T2FD as transmitting antenna for hams, because other antennas can have a better efficiency on the amateur bands.
		For wideband receiving in high level interference area's, the T2FD is however an un-beaten low-noise antenna.
	www.rf-systems.nl /T2FD.html (207 words)

	Wire Antennas : Antennas: Wire
		T2FD The Forgotten Antenna - "Some have called the T2FD a ""squashed rhombic"" antenna.
		It does bear some design similarities to the non resonant rhombic, but theoretically it is admittedly inferior.
		However, the T2FD performs well in a modest amount of space."
	www.dxzone.com /catalog/Antennas/Wire (2801 words)

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