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Call 0345 2300 599The Momobeam RF Choke Line Isolator range is designed to help reduce common mode current on 50 ohm coaxial feed lines. These broadband 1:1 W1JR style chokes provide a clean transition between balanced antenna systems, such as dipoles and Yagi antennas, and unbalanced coaxial cable feed lines.
Common mode current can cause a range of unwanted problems in an amateur radio station, including increased receive noise, incorrect SWR meter readings and interference to electronic equipment in the shack or near the antenna system. Installing a suitable RF choke can help reduce these issues and improve overall station performance.
These Momobeam RF chokes can be installed at the antenna feed point, at the base of a tower, near the shack, or along the coaxial line as a feedline choke. They are also well suited for use with EndFed antenna installations, where controlling current on the outside of the coaxial cable can be especially useful.
This configurable listing allows you to choose from three versions depending on your required power handling and installation needs.
Available Models
| SKU | Power Rating | Frequency Range | Core Type | Connections |
|---|---|---|---|---|
| MOMO-RFC-LI-1KW-SC | 1kW PEP | 3 to 50MHz | Single core | 2 x SO-239 |
| MOMO-RFC-LI-2KW-DC | 2kW PEP | 3 to 50MHz | Dual core | 2 x SO-239 |
| MOMO-RFC-LI-4KW-DBC | 4kW PEP | 3 to 50MHz | Dual big core | 2 x SO-239 |
Key Features
- Broadband RF choke line isolator range
- 1:1 W1JR style design
- Helps reduce common mode current on coaxial feed lines
- Useful for dipoles, Yagi antennas, EndFed antennas and other HF installations
- Helps reduce unwanted receive noise
- Can help prevent misleading SWR readings caused by common mode current
- Helps reduce RF interference in the shack and nearby equipment
- Can be installed at the antenna, tower base, near the shack or along the feedline
- Frequency coverage from 3 to 50MHz
- Choice of 1kW, 2kW or 4kW PEP versions
- Fitted with 2 x SO-239 connectors
Installation Notes
For best results, the RF choke should be positioned where common mode current needs to be suppressed. This may be directly at the antenna feed point, at the base of a mast or tower, near the operating position, or along the coaxial feed line.
When used at the antenna, ensure any connecting pigtail or short coax section is suitable for the intended power level.
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.