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.

811140044 - Broad Band Terminated Dipoles (BBTD, T2FD)
+3

Slip On Feed Line Choke/Isolator - 1/4"/6mm coax cable, RG-58/LMR240, 1.8-300 MHz

BA-58-5
$16.95
In stock
1
Product Details
UPC: Does not apply
Brand: Palomar Engineers
MPN: SLO-1/4-5, -10, -15 - old part # is BA-58
Effective Frequency Range (MHz): 3-300 (5 bead), 1.8-300 (10, 15 bead)
PEP Power Rating (watts): same as coax cable rating
Choking Impedance Range (ohms): 5 bead: 500-1300, 10 bead: 600-1800, 15 bead: 1000-2100
Common Mode Attenuation (db): 5 bead: 16-22 db, 10 bead: 17-25 db, 15 bead: 21-27 db
Estimated Insertion Loss (db): .025
Input Connector Type: none
Output Connector Connector Type: none
Ground Connector (Y/N): none
Enclosure Size (LxWxH inches): none

Includes protective heat shrink

1/4″/6.4mm max Cable Size Chokes

For use with RG-58, RG-6, RG-59, LM-240 and similar size cables – all cable impedances, 160-6 meters. Choke diameter 0.6 inch. Requires 9-1/2 inches of cable for installation of SLO-1/4.Choose SLO-1/4 (5 beads) or for extended choking, choose SLO-1/4-10 (10 beads) or for super extended choking choose SLO-1/4-15 (15 beads).Use SLO-1/4 on RG-6 to stop RFI on cable/satellite systems.


Select chokes with minimum of 500 ohms at your frequency of interest for best results or upgrade to our CUBE(TM), or Super Choker(TM) or Maxi-Choker(TM) chokes up to 10,000 ohms choking

Use on RG-6 coax to stop RFI on cable/satellite systems.

Select 10 bead version for 160 meter use, 15 bead version for even higher choking power.

Snap On and Slip on Feed line chokes available in sizes to fix cables with outside diameters of 1/4", 3/8", 1/2", 3/4", 1" - check website for other size options.

This product was previously named BA-58

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