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.

MAXI-CHOKER Coax Line Isolator/Choke, 1-61 MHz, 3KW, up to -48Db Common Mode Rejection

MC-1-3000
$79.95
In stock
1
Product Details
Brand: Palomar Engineers
MPN: MC-1-3000
Country/Region of Manufacture: United States
Effective Frequency Range (MHz): 1-161
PEP Power Rating (watts): 3000 to 61 MHz, 1500 watts to 161 Mhz
Choking Impedance Range (ohms): 500-5000 (1-61 MHz)
Common Mode Attenuation (db): 20-48db
Estimated Insertion Loss (db): .25 db
Input Connector Type: SO-239 female
Output Connector Connector Type: SO-239 female
Ground Connector (Y/N): optional with static bleeder
Enclosure Size (LxWxH inches): 12" long, 2 in diameter

MAXI-CHOKER Features:

- Uses proprietary Multi-Mix, Multi-Core, Multi-Turn(TM) ferrite technology for maximum choking (up to -48 dB common mode noise rejection) and maximum bandwidth

- 3 KW PEP, 50 ohm SO-239 connectors In/Out, 1-61 MHz

- Suppresses transmitter coax feed line radiation when installed at antenna feed point or reduces common mode receiver "noise" when installed at radio end of coax.

- Available with ground stud/static bleeder option for solving tough RFI issues

- Available with dual stud/wingnut output for ladder line interface

- Works for all coax fed antennas from 1.8-61 MHz (160-6 meters) - excellent for multi-band beams, verticals, dipoles and highly unbalanced off center fed antennas.

- 2-5 times more common mode noise rejection, wider bandwidth and higher power then competing filters

MAXI-CHOKER feed line chokes are used to suppress common mode current carried on the outside of the coax braid which is often responsible for receiver noise and RFI in the receiver/transmitter. These chokes are very useful for suppressing RFI common mode current at the antenna feed point, at 1/2 wavelength intervals along the coax feed line and also at the entrance to the radio station.

This choke is available with a SO-239 input/output and ground/static bleeder stud (optional) for attachment to a ground rod. Use an isolator every 1/2 wavelength for the antenna operating frequency (include velocity factor in calculation). Use the ground lug option for long coax antenna feed lines (over 1/2 wavelength at the operating frequency of any antenna system in the near field of the coax).

Need a smaller power rating but with same, great common mode suppression? Try our 500 watt PEP rated Mini-Choker HERE






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