Momobeam 1:1 Current Balun / RF Choke - 3-50MHz - 1x SO239 to 2x Screw Terminals
SKU Part Number: MOMO-RFC
The Momobeam RF Choke Balun range is designed to suppress common mode current and provide a clean transition between balanced resonant antennas and...
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The Momobeam RF Choke Balun range is designed to suppress common mode current and provide a clean transition between balanced resonant antennas and unbalanced coaxial feedlines. These broadband 1:1 current baluns / RF chokes are ideal for use with resonant dipoles, Yagi antennas and other 50 ohm antenna systems where unwanted RF on the outside of the coax can cause problems in the shack.

Common mode current can increase received noise, cause incorrect SWR meter readings and create interference with electronic devices near the station or antenna system. By adding a suitable RF choke at the antenna feed point, operators can help keep RF where it belongs and improve the stability and reliability of the antenna installation.

The Momobeam RF Choke Balun is suitable for use on Yagi antennas with a 50 ohm feed point or resonant dipoles with low SWR. It can also be used as a replacement for a damaged 1:1 RF choke or current balun in compatible antenna systems.

Three versions are available, allowing operators to choose the correct model for their required power level and installation.

Available Versions

SKU Version Frequency Range Power Rating Connection
MOMO-RFC-SC-1KW Single Core W1JR Style 3-50MHz 1kW PEP 1 x SO-239, 2 x stainless steel bolts
MOMO-RFC-DC-2KW Dual Core W1JR Style 3-50MHz 2kW PEP 1 x SO-239, 2 x stainless steel bolts
MOMO-RFC-DBC-4KW Dual Big Core 3-50MHz 4kW PEP 1 x SO-239, 2 x stainless steel bolts

Key Features

  • Broadband 1:1 current balun / RF choke
  • Designed to suppress common mode current on coaxial feedlines
  • Provides a transition between balanced resonant antennas and unbalanced coax
  • Suitable for resonant dipoles and Yagi antennas with 50 ohm feed points
  • Helps reduce received noise caused by feedline radiation
  • Helps prevent incorrect SWR readings caused by common mode current
  • Helps reduce RF interference in the shack or nearby electronic equipment
  • Can be used as a replacement for a damaged 1:1 RF choke / balun
  • Available in 1kW, 2kW and 4kW PEP versions
  • SO-239 coaxial input with two stainless steel bolt terminals on the opposite side

Typical Applications

  • Resonant dipoles
  • Yagi antennas with 50 ohm feed points
  • Half-wave dipole construction
  • Balanced antennas fed with coaxial cable
  • Replacement 1:1 current balun / RF choke installations
  • Reducing common mode current on HF antenna systems
  • Improving feedline behaviour in fixed and portable antenna installations

Important Note

This product is intended for balanced resonant antennas with low SWR, such as dipoles and Yagi antennas. It should not be confused with an unun for end-fed, random wire or other unbalanced antenna systems.

Shipping & Delivery

We offer UK and international delivery services, including next working day and selected weekend options for eligible orders. Available services, prices and estimated delivery times are displayed at checkout.

Delivery Information

Delivery options depend on the parcel's size, weight, contents and destination. Express and weekend services are subject to availability and cut-off times. Oversized or exceptionally heavy items may require a specialist delivery quotation.

Returns & Cancellations

To arrange a return, please contact ML&S or complete our returns form. You may also exercise your statutory right to cancel by email or another clear statement, without completing the form.

Changed Your Mind?

Under the Consumer Contracts Regulations 2013, most purchases made online or by telephone can be cancelled within 14 days of receipt.

You must notify us of your cancellation within this period and return the goods within a further 14 days.

Please handle all goods with care. Returned items must be in a resaleable condition, complete with their original packaging, and all supplied accessories.

You may inspect goods as you would in a shop. Handling beyond what is necessary to inspect them may result in a lawful deduction for diminished value.

Exceptions

Modified Equipment & Reversal Charges

Additional return conditions may apply to equipment modified at the customer's request, including wideband transmit or receive modifications.

ML&S may charge a reasonable fee to reverse physical modifications and restore the equipment to its original factory specification. Any such charge will be agreed in advance and deducted from your refund.

 

Custom-Made Cable Assemblies

Coaxial cable assemblies manufactured to a customer's specifications are excluded from the 14-day return policy and are non-refundable unless faulty.

 

Software & Labour Charges

Labour and modification charges requested by the customer are non-refundable once the work has been completed.

Computer software may only be returned under the 14-day return policy if it remains sealed and unopened.

Return Postage Charges

Customers are responsible for the direct cost of returning unwanted or incorrectly ordered goods, where permitted by law. You may arrange your own suitable return postage or use one of our optional prepaid services.

Standard Parcels

Royal Mail Return Label

£5.95

Per parcel

For eligible standard-sized parcels, subject to Royal Mail restrictions. Free collection included.

Larger Parcels

DPD Return Label

£7.95

Per parcel

For larger or heavier parcels and any shipments with batteries.

Collection Service

DPD Collection

£25.00

Per parcel

Available upon request for eligible addresses, subject to availability.

Prepaid return charges will be confirmed before booking and deducted from your refund.

These prices apply to eligible UK mainland returns. Oversized items, specialist products and returns from other destinations may require a separate quotation. Estimated return costs will be disclosed before purchase.

Faulty or Incorrectly Supplied Goods

Return postage charges do not apply to faulty, damaged or incorrectly supplied goods returned under statutory rights. ML&S will arrange a free return in these circumstances.

Refunds

Refunds are processed without undue delay following receipt and inspection of returned goods, and no later than 14 days after we receive goods returned under statutory cancellation rights.

Refunds will be issued to the original payment method. Any prepaid return postage charges or lawful deductions for diminished value will be itemised.

Warranty Terms & Conditions

New Equipment Warranty

Minimum 2-Year Warranty

All new products supplied by ML&S carry a minimum two-year warranty against manufacturing defects, excluding batteries, which are covered by separate warranty terms.

Some manufacturers provide extended warranties, such as the three-year warranty available on eligible Yaesu equipment. Any additional coverage is subject to the manufacturer's terms and conditions.

Our workshop may assess and repair faulty equipment on site or refer it to the manufacturer or an authorised service centre where necessary.

Warranty exclusions may include batteries, normal wear and tear, accidental damage, misuse and unauthorised modifications, as specified in the applicable warranty terms.

All warranties are provided in addition to your statutory consumer rights against ML&S, which are not limited by the warranty period.

International Returns & Warranty

Unless otherwise stated, ML&S warranty servicing is carried out in the UK. International customers must contact us before returning goods to confirm shipping and customs requirements.

International customers are responsible for return postage unless the goods are faulty and ML&S has been notified within a reasonable time.

ML&S accepts no responsibility for additional charges resulting from incorrectly completed customs documentation. Any additional duties charged to ML&S as a result will be billed to the customer before return of the goods.

Need Help With a Return?

Our team can assist with returns, postage arrangements, modifications and warranty claims.

Nothing in these terms excludes or limits your statutory consumer rights.