1072922502 - Portable Operation RFI Kits

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

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

SKU BA-9-1000

$29.95

Bulk pricing available for quantities of 2 units or more

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Quantity	Price per item	Discount
2 items	$27.95	7% off
10 items	$24.95	17% off

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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).

Portable operation is fun but also brings challenges to the radio operator concerning receiver “noise” levels, RF interference from adjacent sources including close by transmitting stations, and RFI from portable generators. A typical scenario and some suggested Palomar product solutions are shown in the picture below:

Generator RFI testimonial:

Bob 

Received your order in a timely fashion. Tried the generator kit on Sunday & it drops the noise from S9 to S5 and 
took out all the electrical noise.  I may want some more toroids from you at some point for other interference problems
I have  here.
Ken VE3KCY

Using an amplifier? Don’t forget our Linear Amplifier RFI Kits

Want to make up your own RFI kits for a particular operation? Here are links to some of typical RFI solutions used in portable operations:

AC/DC common mode filters

Feed Line chokes

Coax Noise Filters

If you use a computer for logging in your portable operations, RFI getting into computers will often lock up your computer and/or radio and a computer RFI suppression kits may be helpful

Computer RFI Kits

Make your expedition or portable operation a pleasant and fun outing and remember to take along your RFI kits so you have more time to operate rather then to troubleshoot intermittent or noisy receiver conditions.

Portable Antenna Kits

If you need an effective portable antenna which folds up for transport yet is easy to deploy at your operating site, consider the BULLET series of end fed wire antennas.

BULLET Antennas (click on link or picture for more info)