Broad Band Terminated Dipoles (BBTD, T2FD)

Broad Band Terminated Dipoles (BBTD), Tilted Terminated Fold Dipoles (T2FD) and Balanced Termination Folded Dipole BTFD) antennas can be designed to cover a large range of frequencies between 1.8 30 MHz.  Longer length antennas generally provide better low frequency efficiency but take up a larger footprint of land.   One BBTD that has worked well at the AK6R antenna farm is shown below.  Many other designs are available and can be found at www.HFLINK.COM as well as other internet sites.  Your mileage may vary using this antenna, but as a general coverage antenna for ham and shortwave broadcast, the simplicity can’t be beat even though an individual dipole on a specific band may out perform this broad band dipole.  Palomar Engineers has all the parts you need to build this antenna, so why not give it a try?

BBTD at AK6R 1024x726 - Broad Band Terminated Dipoles (BBTD, T2FD)

 

Depending on the source of the antenna design, different value baluns are specified.  Our Bullet(TM) baluns in ratios of 9:1, 12:1 and 16:1 are excellent for this type of antenna as they are broadband from 1.8-61 MHz and will take up to 500 watts PEP.

1032773520 - Broad Band Terminated Dipoles (BBTD, T2FD)
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50:600 ohm, (12:1) CUBE™ Balun/Unun, 1.8-31 MHz Balun/Unun, RX Only/1KW/2KW/3KW PEP, T2FD, Rhombic, End Fed, Flagpole

Store/Antenna Products/CUBE Impedance Transformers (<1:1, 1:1, >1:1)/50:600 ohm (12:1) Transformers
SKU CB-12-1000TS
$119.95
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List price $139.95
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PEP Power rating
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50 items$99.9517% off
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50:600 ohm, (12:1) CUBE™ Balun/Unun, 1.8-31 MHz Balun/Unun, RX Only/1KW/2KW/3KW PEP, T2FD, Rhombic, End Fed, Flagpole
Store/Antenna Products/CUBE Impedance Transformers (<1:1, 1:1, >1:1)/50:600 ohm (12:1) Transformers
Product Details
Country/Region of Manufacture: United States
Type: New
Input ohms/Output ohms: 50 in/600 out balanced (balun) or unbalunced (unun)
Frequency Range < 2:1 SWR (MHz): 1.8-31
PEP Power Rating (watts): RX only/1000/2000/3000
Insertion Loss (dB): < .1 dB
Input Connector: SO-239
Hardware Type: Stainless Steel
Enclosure Size: 4 x 4 x 2, 3KW = 4 X 4 x 4
Weight (pounds): 2


HF 12:1 Impedance Transformers

12:1 Baluns are useful transformers for 600 ohm balanced loads the impedance at the end of the feed line is 600 ohms (1/2 wavelength feed line), or high impedance feeds for rhombic, T2FD and traveling wave antennas.

12:1 Ununs are useful between coax and long wires with a load impedance near 600 ohms like a beverage antenna. Shortwave listener antennas also can benefit with the 12:1 unun and it may provide a better match than 9:1 ununs – this means quieter noise levels and stronger signals so you can hear distance stations easier.

For end fed antennas, use a 9:1 unun or 12:1 unun - also available in the "Bullet" antenna end fed style (Bullet-12U-500)

Receive only baluns/ununs are rated for 100 watts PEP

All enclosure boxes have 2 side flanges with 1/4" holes.

All of these products are made to order and typical production time is 10 days depending on quantity.

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Likewise Termination Resistor values vary from 500-1250 ohms and we have a good selection shown HERE: