Three Band Low Pass Filter PCB Kit

$15.74 - $30.84 (Inc. Tax)
$13.12 - $25.71 (Ex. Tax)

NOTE Customers outside the Eu pay the lower (Ex. Tax) prices!

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Lowpass Filter PCB Kit for WSPRlite and General Use

***Filter builder for hire in the UK*** Click here. 

New compact PCB for better choice of enclosures and improved high frequency performance

Three options:

  • Board kit only - use to mix and match filters using our band packs or your own components.
  • Board kit plus band packs for 160m, 80m and 40m - perfect for use with the WSPRlite Flexi or Classic
  • Board kit plus band packs for 20m, 15m and 10m - perfect for use with the WSPRlite Flexi

The filters are selected using jumper links (supplied).

Board Kit includes PCB, 2 x jumpers, 2 x header pin arrays, 1 x SMA tail, 1 x SMA socket, 1 x cable tie.

PCB size 59 x 87 mm. Mounting holes M3.

Click here for kit instructions.

Enclosure Options

Options here apply to PCB V1.2 Nov 17 onwards. Print your own enclosure! Lots of folks have 3D printers and are desperate to find a use for them. Maybe you have one yourself or know someone who has one? We provide the files free on Thingiverse. Click here.

Buy a printed enclosure from a third party:

We recommend PLA or ABS plastics.

Note: board fits in Hammond 1591SSBK enclosure 

Also available from:




13 Reviews Hide Reviews Show Reviews

  • 5
    Three Band Low Pass Filter PCB Kit

    Posted by David G4ZAO on 19th Aug 2018

    Good quality components and simple to construct.

  • 5
    3 Band low pass filter

    Posted by Steve on 10th Aug 2018

    Excellent kit, easy to build when following the comprehensive instructions

  • 5
    Three Band Low Pass Filter Kit

    Posted by David Hepworth on 29th Jul 2018

    Everything you need is supplied and the instructions provided via the website are comprehensive and straight forwards. The kit was very easy to build.

  • 5
    A must have!

    Posted by Brian on 2nd Jul 2018

    I purchased the low pass filter PCB kit after looking at the WSPRlite Flexi's spectral output without a filter. Yes, you absolutely need a filter with the Flexi. Thankfully, this PCB kit made that job so much easier! Components were very easy to solder thanks to the well planned thermal pads. I would highly recommend this kit.

  • 5

    Posted by G1VWC on 17th Jun 2018

    Quality kit - Easy to make with with clear instructions.

  • 5
    Low pass filter 160, 80, 40

    Posted by Steve M6MKX on 25th Apr 2018

    The low pass filter kit is an excellent product designed for an easy build, but delivering excellent performance. Would recommend this unreservedly.

  • 5
    Low pass filter kit

    Posted by Unknown on 12th Apr 2018

    Took my time building this kit, as I wanted to ensure it worked first time which it did. The online instructions were excellent. Would highly recommend this kit.

  • 5
    A great time saver

    Posted by Tom on 23rd Mar 2018

    A well thought out and functional kit of parts providing all the bits for the WSPRlite LPFs. I did check inductance of constructed toroids with a Peak LCR45 and most needed a turn or two of wire removed from suggested number to get value spot on. I doubt this would be a major issue however in affecting performance.

  • 5
    Low Pass Filter Kit

    Posted by Ken on 14th Mar 2018

    As with all the SOTABEAMS Kits this is the best in it's class, I would recomend it to anyone, very easy to build.