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.

50:50 (1:1) CUBE™ Ladder Line/Beam to Coax Balun, 1.8-61 MHz, 1.5KW, G5RV/ZS6BKW/Dipole/Beam

SKU CB-1-1500TS
$119.95
Bulk pricing available for quantities of 2 units or more
Input Connector
Stud Position
1
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50:50 (1:1) CUBE™ Ladder Line/Beam to Coax Balun, 1.8-61 MHz, 1.5KW, G5RV/ZS6BKW/Dipole/Beam
Product Details
MPN: CB-1-1500TS
Country/Region of Manufacture: USA
Input ohms/Output ohms: 50 ohms in, 50 - 150 ouhms output
Frequency Range < 2:1 SWR (MHz): 1.8-61 MHz
PEP Power Rating (watts): 1500
Input Connector: UHF or N
Output Connector(s): top studs
Hardware Type: Stainless Steel output connectors
Enclosure Size: 4 x 4 x 2
Antenna Compatability: G5RV/ZS6BKW/Dipole/balanced output

The lower powered version of our popular CB-1-5000, the CB-1-1500TS Balun is a 50 ohm to 50 ohm, quad core feed line choke designed to provide high choking impedance between a balanced ladder line feed line (zepp, G5RV/ZS6BKW, extended double zepp, etc.) and short 50 ohm coax feed line (to antenna tuner) at a power of 1500 watts PEP from 1.8 to 61 MHz. The CB-1-1500TS is configured as a Guanilla transmission line transformer with balanced outputs (current balun configuration). It is best used when ladder line impedance seen at the end of the ladder line to balun connection is close to 50-150 ohms. Enclosure box is 4″ x 4″ x 2″. Typical choking impedance range is 1K-10K ohms from 1-61 MHz and common mode suppression is 30 dB..


Typical ZS6BKW multi-band antenna with CB-1-1500 or CB-1-5000

ZS6BKW at AK6R png - Broad Band Terminated Dipoles (BBTD, T2FD)

N Connector versions are made to order, email for quantity production times

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