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Call 0345 2300 599The 4O3A Band Pass Filter Series XL is a high power filtering solution designed for serious contesters and multi station environments. Each filter handles up to 4,500 W ICAS and is placed on the output side of a linear amplifier to suppress harmonics and broadband noise before it reaches the antenna system. This improves station performance, protects sensitive equipment and provides stable operation during heavy use such as contests.
The Series XL range covers all major HF contest bands plus 6 m and 160 m. It includes the required 10 m, 15 m and 20 m filters for the HFC4500 Triplexer Combiner. Each unit is hand tuned and built with silver plated high Q coils in a strong aluminium enclosure that prevents mechanical drift. Cooling fans are fitted as standard to maintain safe performance at sustained power levels.
Filtering takes place after final amplification which reduces the need for multiple sets of low power filters between transceivers and amplifiers. Any transceiver in the station can use a single filter for its band which simplifies switching and reduces system cost.
Insertion loss is kept very low through careful design and the use of high quality components. Out of band rejection typically exceeds 55 dB and can reach 75 dB on adjacent contest bands. This delivers strong suppression of unwanted signals and supports clean, reliable operation.
The 160 m model is a five pole low pass filter with the other bands being a band pass filter.
Comes standard with SO239 connectors.
N type and 7/16 DIN connectors available by special order - contact [email protected]
Key Features
• Models available for 6 m, 10 m, 12 m, 15 m, 17 m, 20 m, 30 m, 40 m, 80 m and 160 m
• Required 10 m, 15 m and 20 m models available for the HFC4500 Triplexer Combiner
• Power handling up to 4,500 W ICAS
• Very high out of band rejection typically above 55 dB and up to 75 dB
• Extremely low insertion loss around 0.5 dB
• Cooling fans fitted as standard
• Hand tuned for optimum filter performance
• Rugged aluminium enclosure with mounting flanges
• Silver plated coils with three point mechanical support to prevent detuning
• Ideal for SO2R and multi operator contest stations
• Simplifies station switching and reduces the need for multiple low power filter banks
• SO239 connectors as standard
• N type and 7/16 DIN connectors available by special order only - [email protected]
Technical Details
• Power rating up to 4,500 W ICAS
• Five pole filter network across all HF models
• Rejection typically above 55 dB on adjacent contest bands
• Insertion loss around 0.5 dB
• Cooling fans fitted as standard 12 VDC 40 mA
• Size of 160 m and 80 m models 62 x 15 x 15 cm
• Size of all other models 62 x 15 x 11 cm
• SO239 connectors supplied as standard
• Mechanically reinforced silver plated coils for long term stability
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.