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.
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)
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.
9 Reviews Hide Reviews Show Reviews
As with all the equipment I have bought from soyabean this is another well made product.
The kit is really easy to construct making it ideal for those new to a soldering iron. Build one, you will not be disappointed.
This come handy a few times and handy around the shack.
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 :)
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!
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.
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.
I didn't really need another dummy load but this one looked very nice and had a great price. I like to teach my sons building and soldering skills and this kit was fun to build with my 10 year old. It only took about a half hour and we were in no hurry.
I checked it with my antenna analyzer and it is nice and resistive at 49-50 ohms @ 1 - 30 MHz. It is only advertised to 30 MHz but I dialed the analyzer up to 6m and 2m and it was perfectly workable. Even at 70cm it is slightly reactive but would be plenty useful for testing a dual-band HT.
I will be buying more kits from SB. Nice job on this kit.
When I was first licensed, soldering came as second nature to me, but not having had the time for either home brew construction or radio operating for many years, I needed a small project to re-aquaint myself with the skill.
Not only is the BOXA-Load a first class piece of equipment, it is a great introduction (or reintroduction) to circuit building.
I look forward to building more of Richard's kits and hopefully there will be more to come (perhaps some QRP gear?).