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.

Super Bullet 50:50 (1:1) HF Balun + Optional Dipole Kit - .1-61 MHz, 1500 Watts PEP, up to 38 dB noise reduction

SBULLET-1B-1500EB
$119.95
In stock
1
Product Details
UPC: Does not apply
Brand: Palomar Engineers
MPN: Bullet-1B-1500EB
PEP Power Rating (watts): 1500
Common Mode Attenuation (db): up to 48 dB
Estimated Insertion Loss (db): .1
Input Connector Type: SO-239
Output Connector Connector Type: Side Eyebolts

New improved version now goes down to 500 KHz (25 dB common mode AM Broadcast band suppression) and up to 61 MHz < 2:1 SWR. Choose Balun only or add optional dipole wire kit (wire, Insulators, Spade lugs for attachment to balun - assembly required). Center insulator and Balun in one case - 1/4" stainless hardware and 1500 real watts rated!

The SBullet-1B-1500EB is a multi-core current balun with built in feed line choke offering up to 38 dB (on 20 meters) of common mode current rejection (plenty for most applications) to keep RFI off the coax outer braid during transmit operations. The SBullet-1B-1500EB is housed in a waterproof PVC enclosure that is lightweight yet robust in features and makes a great high power antenna feed solution for dipoles and other balanced antennas. Halyard hoist at top of balun for convenient attachment point. Input is via SO-239 coax connector and output with dual side eye bolt output and wire strain relief. Rated 1500 Watts PEP Watts from .1-61 MHz. SBullet-1B-1500EB weight is 2 pounds.

This balun/feedline choke keeps TRANSMIT RFI off the coax outer braid while transmitting. If your station suffers from common mode RFI noise on RECEIVE, then use one of our Common Mode Coax Noise Filters (such as the CMNF-1500) that suppresses common mode noise on RECEIVE operations.

Make a FAN DIPOLE using optional dipole kits (e.g. 80/40 would use extra 40 meter dipole if you chose the 80 meter dipole lit for this listing).

NOTE: We rate our Bullet baluns (and ununs) VERY conservatively at 1500 watts PEP with a 50% duty cycle. Some manufacturers selling low cost baluns may use a 5% duty cycle for their PEP rating to make it appear you get a higher rated balun for a lower price, but you may in fact be getting be getting less. Their 1500 watts PEP really means 75 watts continuous or 150 watts at a 50% duty cycle (like FT8) compared to our 1000 watts at 50% duty cycle (assuming a SWR < 2:1). Our baluns typically cover a larger frequency range under 2:1 SWR which make your transceiver happy and probably will last longer with less electrical stress.

Remember we over engineer our products, to out perform our competition - just compare the weight of our baluns to theirs and you will know we put much more into our products so you don't have to worry about failure at a critical moment.


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