Impedance Transformers (<1:1, >1:1)

Termination Resistor, 400 Ohm Non-Inductive for Terminated Vee, T2FD, BBTD, Rhombic, V-Beam, 1-61 MHz, 600 Watts

SKU TR-400-600
$99.95
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Termination Resistor, 400 Ohm Non-Inductive for Terminated Vee, T2FD, BBTD, Rhombic, V-Beam, 1-61 MHz, 600 Watts
Product Details

Broadband, Non-Inductive Termination Resistor load used on many terminated antenna types such as Terminated Vee (see picture), T2FD, Broadband Terminated Dipole (BBTD), Rhombics, V-Beams and others

Resistive Value: 400 ohms (+/- 10%)

SSB (25% duty cycle) rating in Watts: 600

CW/FT8 (50% duty cycle) in watts: 300

Length (tip to tip) Inches: 11 1/4"

Width inches: 2 1/4"

Inductance < 20 nH (1-61 MHz)

Internal Resistance Wattage: 150 watts

Antenna Note: For terminated V antenna shown, use a 16:1 + 1:1 hybrid transformer to match the 50 ohms to 800 (400 + 400) in the antenna "legs"


Palomar Engineers offers a variety of impedance transformers configured as Baluns (balanced coax to unbalanced load) or Ununs (unbalanced coax to unbalanced load) for  matching typical 50 ohm feed line impedances to antenna or other load impedances.

We specify impedance ratios as an output to input ratio where the output (or load) is given first and the input is given second (e.g. 100:50 (2:1) would mean a 100 ohm output and a 50 ohm input; a 25:50 (1:2) would mean a 25 ohm load and a 50 ohm input).  Most all products use a 50 ohm input unless otherwise specified.

We have products that are available as kits for the do-it-yourself (DIY) person or fully assembled and tested units for the “Plug & Play” crowd.

Our impedance transformers are available using two different topologies: Binocular cores or  toroid cores with multiple turns for increased effectiveness and wide band frequency transformations.  We utilize single and multiple core transformers using high order windings when needed to extend product performance.

We rate the power ratings as watts PEP (Peak Envelop Power) with standard duty cycles for various modes. To determine the PEP rating required for your needs, see: Choke & Transformer Power Ratings

This website page serves as a link page to the frequency ranges of our impedance transformers configured as either baluns or ununs.  You can click on a picture to go to the specific page about the products described in the picture.