BOXA-LOAD 50 Ohm RF Dummy Load

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NOTE Customers outside the UK & EU pay the lower (Ex. Tax) prices!

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50 Ohm Dummy Load

An essential piece of equipment in any radio shack, the BOXA-LOAD is a 50 Ohm dummy load. VSWR better than 1.1:1 from 0 - 30MHz. The BOXA-LOAD includes a built-in LED RF indicator to show when you are transmitting.

Use your dummy load for transmitter testing and alignment. Also useful for testing VSWR bridges.

The kit is easy to build and would make a great club project or evening project. Attention to detail: we even supply a specially made bending/spacing jig for the power resistors so that your load looks just as good as ours! The BOXA-LOAD uses all though-hole components.

NOTE: engraved panels supplied may be black, blue or clear. 


Power rating

5 Watts continuous

10 Watts 10 minutes max.

20 Watts 1 minute max.

Allow 10 minute cooling time.

NOTE: the total power rating of the resistors used in the BOXA-LOAD is 24 Watts. To improve power handling, we mount the load resistors off the board. The BOXA-LOAD case is ventilated front and back. We rate our load conservatively.

Return loss (a measure of how well the load absorbs RF)

> 30 dB 0-30MHz (VSWR better than 1.07:1)

> 25 dB 30-70 MHz (VSWR better than 1.12:1)

> 20 dB  70-150 MHz (VSWR better than 1.22:1) 

BOXA Products:

All BOXA products are available in three configurations:

1. Board kit: a high quality PCB with all components. 

2. Board kit plus enclosure: adds a high quality rugged aluminium enclosure complete with laser-cut front and back panel. No drilling, no metalwork needed!

3. Fully built and tested: the complete product with enclosure, built and tested at our factory. Ready to use.


Instructions are available HERE!


Also available from our international agent(s):  



12 Reviews Hide Reviews Show Reviews

  • 5
    Great build quality

    Posted by Chris 2E0FRU on 14th May 2020

    I've been meaning to buy a dummy let as for some time. I'm really pleased with this item. It's well made and a good size.

    Highly recommended.


  • 5
    Dummy Load

    Posted by Diarmuid Battisson on 23rd Dec 2018

    Handy bit of kit; easy to follow instructions and fun to build. The unit is solid, compact and perfect for QRP; the clear perspex front and back allows a view to the pcb inside.

  • 5

    Posted by Phill on 11th Oct 2018

    Very easy to build and is perfect for my needs. Highly recommended.

  • 5
    well made product

    Posted by alan on 25th Mar 2018

    As with all the equipment I have bought from soyabean this is another well made product.

  • 5
    More accurate than my MFJ DL

    Posted by John, G3UCQ on 9th Mar 2018

    The kit is really easy to construct making it ideal for those new to a soldering iron. Build one, you will not be disappointed.

  • 5
    RF Dummy Load

    Posted by Terry on 3rd Jan 2018

    This come handy a few times and handy around the shack.

  • 5
    Great Kit for Beginners

    Posted by Dave Cain 2D0YLX on 29th Oct 2016

    Sotabeams have done it again! This is a great little kit suitable for anyone - even those with little or no experience of soldering. Very straightforward, builds in minutes! Thank you to Richard and his team for another simple but essential piece of kit for any shack :)

  • 5
    Suitable for all ages

    Posted by Andy M0VVA on 12th Oct 2016

    My 12 year old son (M6OMX) built this dummy load last night as a follow on from his Intermediate (Pixie radio) practical exercise and to use as a load for the radio. The provided documentation and straightforward design made it an easy build and both he and I are very pleased with the results. Thanks SOTABeams for the quick dispatch and another great product!

  • 5
    Better than I thought

    Posted by Simon G1CSM on 16th Mar 2015

    I was very impressed with this little dummy load. I have always stayed away from kits and home brews as they stick out like a saw thumb, that tobacco tin with wires sticking out of it. Not so with this one, even with my limited practice it looks like a pre-built professional unit. Very easy to build with comprehensive instructions and most importantly works well. I set up the audio on my Kenwood with not a movement on the reflected power needle.

    I am now looking for my next project.

  • 5
    A Great Dummy load for portable ops

    Posted by Mervyn G4KLE on 26th Dec 2014

    I saw this advertised and decided that I would purchase it as a Christmas Stocking Present for myself. I own a KX3 and thought it would fit into my Go-Box for when I go QRP/P.

    I constructed it this morning (Boxing Day) after a leisurely morning. So well manufactured and assembly is so straight forward. Thanks again SOTA Beams for another great product. Happy New Year to everyone.