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?
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.
PURPOSE
These kits are designed to choke common mode currents going into or exiting from your amplifier cables.Filters are supplied for the RF In, RF Out, Relay Cable/control lines, and AC power line.Use of the filters often helps cure SWR problems between amp exciter and amp and between amp and antenna tuner or direct to antenna.The AC power line choke helps keep common mode current out of the power line which could cause interference to other devices connected to the same power line if not suppressed.
USE
Standard kit for amplifiers with single input, single output, relay keying and AC input
Deluxe Kit for amplifiers with dual inputs/outputs, frequency/keying control lines
KIT INCLUDES
|
Filter Type |
Usage |
Standard Kit |
Deluxe kit |
|
F240 Ring (1.4” ID) |
RF Exciter input |
1 |
2 |
|
Snap On (1/2” ID) |
Ethernet, PTT control |
2 |
2 |
|
Snap On (1” ID) |
RF Output |
1 |
2 |
|
Snap On (1” ID) |
120/240 VAC Input |
1 |
1 |
|
Total Filters |
5 |
7 |
INSTALLATION GUIDELINES
Standard Kit - Part# RFI-LA-FLEX-1
RF Input:Ring Filter (1.4” ID) – 5-9 turns of RG-58/8X size through center
RF Output:Snap On Filter (1” ID) – 3 turns of coax cable through center
PTT Relay Cable:Snap On Filter (1/2” ID) – multiple turns through center
Ethernet Cable:Snap On Filter (1/2” ID) – multiple turns through center
AC Power:Snap On Filter (1” ID) – 3 turns of power cord through center
Deluxe Kit - Part# RFI-LA-FLEX-2
RF Input (2)Ring Filter (1.4” ID) – 5-9 turns of RG-58/8X size through center
RF Output: (2)Snap On Filter (1” ID) – 3 turns of coax cable through center
PTT Relay Cable:Snap On Filter (1/2” ID) – multiple turns through center
Ethernet Cable:Snap On Filter (1/2” ID) – multiple turns through center
AC Power:Snap On Filter (1” ID) – 3 turns of power cord through center
Also make sure you connect a good RF ground to the amplifier ground post.
Likewise Termination Resistor values vary from 500-1250 ohms and we have a good selection shown HERE: