50:450 ohm (9:1) Balun or Unun Core Kit, .5-32 MHz, 1000 watts PEP, end fed/Ladder Line, T2FD antenna

Name: 50:450 ohm (9:1) Balun or Unun Core Kit, .5-32 MHz, 1000 watts PEP, end fed/Ladder Line, T2FD antenna
Brand: Palomar Engineers
SKU: BA-9-1000
Price: 29.95 USD
Availability: InStock
Rating: 5.0 (2 reviews)

5.0

2 reviews

Store/Antenna Products/CUBE Impedance Transformers (<1:1, 1:1, >1:1)/50:450 ohm (9:1) Transformers

SKU BA-9-1000

$29.95

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Gregory G.

LEESBURG,

United States

Oct 14, 2025

Except that the directions needs a wiring visual after winding wire around the ferrite core, and along with Snap On RF Choke/Isolator, this excellent kit helped me solve matching issues with a Moonraker GPA-80 vertical antenna. Along with better matching resolution, I am also able to put more power to the antenna's radiating element and without common mode interference using the snap on beads. Under fair propagation conditions using FT8 I have been able to reach the continents using only 75watts !

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50:450 ohm (9:1) Balun or Unun Core Kit, .5-32 MHz, 1000 watts PEP, end fed/Ladder Line, T2FD antenna

Store/Antenna Products/CUBE Impedance Transformers (<1:1, 1:1, >1:1)/50:450 ohm (9:1) Transformers

Product Details

MPN: BA-9-1000

Type: balun or unun

Input ohms/Output ohms: 50 in, 450 out

Frequency Range < 2:1 SWR (MHz): .5-32

PEP Power Rating (watts): 1000 Watts PEP

Antenna Compatability: Unun: End fed, Balun: Ladder line

Purpose. Model BA-9-1000 is a 9:1 balun/unun kit (assembly required from parts supplied) used to translate a 50 ohm input up to 450 ohms at RF power levels up to 1000 watts when used with a matched load. It provides conversion from unbalanced coax to balanced ladder line/antenna feed point and gives a 9:1 impedance step-up to reduce SWR on the coax. Place at the junction of the balanced line and the coax to convert from balanced line to unbalanced coax.It can also be wired as an UNUN with unbalanced coax input to unbalanced output such as an end fed antenna.

KIT Contents. The kit consists of a F240-61 ferrite toroidal core, three colors of insulated wire, a SO-239 UHF connector with stainless steel hardware, and an instruction manual.

Assembly time: About 1 hour

Radio Club idea:

Buy 10 for a club do it yourself construction project - you can learn something and also build an end fed antenna (just add wire).