AMATEUR RADIO FOR THE GREAT OUTDOORS
Antennas including linked dipoles, telescopic poles also ham radio kits - everything you need.
If you are thinking of leaving your ham shack with your radio, take a look. We can help.
Now shipping with more compact PCB V1.1 - see revised instructions (from 17 Jan 2017)
Low pass filters for 40m, 80m and 160m (all three supplied). Our lowpass filter kit builds up to a neat pcb with low pass filters for 7 MHz, 3.7 MHz and 1.8 MHz. The filters are selectable with movable jumpers. The kit is supplied with a pre-wired co-ax tail with SMA plug to connect directly to your WSPRlite and a board-mounted SMA socket for connecting your antenna: no fiddly connectors to install!
The PCB has been designed with new builders in mind. High quality through-hole components have been used throughout including Grade 1 Murata/TDK C0G/NP0 capacitors, Grade 1 solderable enamelled copper wire and gold plated jumpers.
Each filter is a 7 element low-pass with great performance and low loss. The kit is rated at 25 Watts - suitable for general QRP transmitter use. Board has M3 mounting holes for easy use.
Easy to make, easy to use! Click here for the instructions.
PCB V1.1 size 73 x 97 mm. Mounting holes M3.
Showing reviews 1-10 of 11 | Next
Posted by Kirk Binning on 28th Apr 2017
I purchased the kit and it was fun to build. After wrapping nine toroids, I am now a master. It works great on my WSPRLite!
The only problem I have with it is that it is so delicate. I would like to take it out on Field Days to test the antennas, but with all those toroids sticking up, I don't know how to transport it. I wish a case was an option.
BTW: Watch the suggested video if you have never worked with the glass covered wire.
Posted by Alan VK6CQ / VKØLD on 21st Apr 2017
Well designed circuit with quality PCB & components. Easy to build (take your time winding the toroids!). Performs well within specification as measured on RF laboratory spectrum analyser . 21 days UK to Aus by ordinary airmail. Great addition to WSPRlite antenna tester TX unit.
Posted by email@example.com on 13th Apr 2017
Use the filter on 40m together with my WSPRLite device.
Excellent kit, only built one filter section for 40m as I do not have antennas for 80m or 160m.
Winding toroidal inductors went well following the instructions.
Posted by Ulrich Gonter-Linz on 1st Mar 2017
Last evening I assembled the Low Pass Filter kit. Well, I never wound Inductors before. But with a little concentration and the help of my cats ;) it worked out pretty well. It took me 3 hours and 30 minutes to finish it. I'm not that experienced in soldering as well but the kit is very easy to understand, all parts are clear and so no one needs to be afraid. Even I did it :D Thanks to SOTABEAS - great kit! 73 de Uli DG7NFX - now WSPRing on 40 as well!
Posted by Egon, PA3AAT on 23rd Feb 2017
It took about 3 hours to build. Put it on air and within 15 minutes on 7 MHz already 65 spots! Fantastic! Thanks SOTABEAMS team :-)
Posted by Richard G8ITB on 22nd Feb 2017
Nice and simple addition to the WSPRLite - consider details for 60 metres and a simple switch circuit (I built my own) for inclusion in the next version. Nice concept!
Posted by Duncan G3WZD on 15th Feb 2017
I purchased this kit as I wanted to user my WSPRlite on 40M. This was the first kit I had built for many years and my first experience of winding small toroids. The PCB is of high quality and very clearly marked; components were easy to identity (thanks to the colour coding on the carrier strip Richard!) which eliminated the potential for error. My bench magnifier was a big advantage and total build time was less than 3 hours (including winding the toroids).
Posted by Ryan WC6Q on 5th Feb 2017
This was my introduction to winding my first torroids. It was as simple ass could be, a little time consuming but a nice learning experience. The kit itself was easy to build as well. No SMC.
Posted by John VK6JB on 2nd Feb 2017
Does exactly what it should do. Great starter for those who have never wound toroids before. Nice size board, good for older eyes.
Seems typical of the SOTA Beams stuff, great quality.
Posted by Steve G8KNC on 16th Jan 2017
Well made circuit board and very good instructions. Took me about 2.5 hours to complete, including winding the toroids.
I had to use a headband mounted magnifier because of dodgy eyesight these days, but managed without any issues. They even mark the different value capacitors for you as the writing on them would need a jeweller's eyeglass to read!
Showing reviews 1-10 of 11 | Next
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