SKU Part Number: AS-W3NQN-40M-FILTER
W3NQN Band Pass filters are the best single band filters you can buy. Each one is hand-made by W3NQN or by K7MI to W3NQN's specifications. The...
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£144.95 £120.79
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W3NQN Band Pass filters are the best single band filters you can buy. Each one is hand-made by W3NQN or by K7MI to W3NQN's specifications. The performance of these W3NQN design filters, regardless of who assembles them is the same. We will fill your order using the filters we have on hand when you place your order. K7MI's filters are those that have been used in our FilterMax units for years and we are now also shipping them in single band packaging.

From time to time, we may be out of stock of one or more of them.

If you are planning a DXpedition or a contest expedition where you will need these filters, please order in advance and let us know when you actually need to have them in your possession. We will work with you to meet your schedule.

The 2 kW low pass filters and Broadcast Band (BCB) filters are all made by W3NQN only and should be considered as "special order" items that are not likely to be in stock. An interval of several weeks should be expected for delivery.


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FM-6 filter switching system that can switch filters as directed by a band decoder or switch
FilterMax IV - 6 W3NQN Bandpass Filters In ONE Compact BOX with removable and replaceable filters
New BandPasser II model AS-419 economical 6 band automatic or manual 100 Watt band pass filter system
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2000 W low pass filters for reducing harmonics.
Military HF, Commercial HF, and Marine Communications system


We have several shipping options for our products, including next-day and Saturday/Sunday delivery for certain items. Please see these options at checkout.


If you have any equipment that needs to be returned to Martin Lynch & Sons, please fill out the form below:

Click here for returns form

Upon receipt of goods you have 14 days to return goods however the goods must be returned in original packaging and care must have been taken with the goods you wish to return. Under distance selling regulations you are not entitled to any refund on carriage charges or modification charges made at your request.

Warranty Terms and Conditions

Outside of the 14 faulty return period, returned items cannot be accepted, unless covered by manufacturer's warranty. We will repair as much as possible on site however in exceptional circumstances products may have to be returned to the manufacturer of distributor.

For repairs/replacements under manufacturer’s warranty for any item please download a ML&S return form from the link below and return to ML&S with the faulty product.

International Warranty information

Warranty service for items we sell is available in the U.K. only, unless otherwise noted. It is your responsibility to pay freight for returned items to the U.K. and back to you for desired warranty coverage. All of our NEW products come with a minimum 12 month warranty, (Yaesu & Icom 24 months), with up to 90 days on second-hand equipment. Items returned for service must state "returned goods for repair" on the return air waybill or U.K. import customs duties apply and will be added to your invoice. For more info about returning items please contact our customer help desk, sales@hamradio.co.uk