(tr)uSDX QRP Transceiver – Five Bands 5W

truSDX QRP Transceiver
truSDX QRP Transceiver

(tr)uSDX QRP Transceiver is a five bands 5W multimode transceiver excellent for SOTA activations and other portable work on the HF amateur radio bands.

After receiving my call sign and my amateur radio license, I realized that I’m way behind building my own equipment. Just like everyone else, I was really excited that now I’m allowed to transmit and I’m able to do QSO’s.

Sadly, I had no transceiver to do such things. Here is where my friend Andrei ( YO6TJJ ) from roWaves came to the rescue. He sent me one of the best presents lately, a (tr)uSDX QRP Transceiver that I can now use to get on air and do as many QSO’s as possible. Thank you Andrei and the roWaves team. Thank you to both developers as well, Manuel ( DL2MAN ) and Guido ( PE1NNZ ).


I was thinking a lot lately to order the PCB and the components to build one. The only thing that made me postpone my decision, was the lack measuring equipment. That made me think that I will not be able to bring it up to the specs and I will be disappointed about it.

I knew that my friends at roWaves used to have them for sale, so back then I was waiting to have them available for order. Well… it seems that Andrei can read my thoughts, because I woke up with the delivery man in front of the house, with an unexpected package. And what a package, as it not only made my day, but my entire month. Really well packed I must say, as always coming from roWaves. That was the first pleasant surprise I had when I ordered from them for the first time.



Don’t forget to check DL2MAN web page to always stay up to date with the latest list of approved sellers for the (tr)uSDX. Especially that lately there are a lot of shady transceivers available on the market that will never be able to do firmware updates since the manufacturer did not respect the license.

My friends at roWaves no longer sell the (tr)uSDX Transceiver.

truSDX Multimode Transceiver

3. THE (tr)uSDX TRX

In the video down bellow I will talk about most of my opinions about this little TRX. The best part of the (tr)uSDX is that it’s multimode and has five HF bands available. If you like QRP and portable work this is the perfect choice so far. I usually don’t like any digital equipment. I did followed all the work behind the (tr)uSDX QRP Transceiver on Manuel’s YouTube channel.

From the first experiments to what it is today, it has been a lot of hard work behind it. I cannot say that I don’t appreciate that. For that reason, I’m happy I have and I’m using one. For a beginner in amateur radio, this little QRP TRX is just perfect. I would also recommend you to read the User Manual. Many of the questions people usually ask have answers in the manual.

(tr)uSDX Multiband Transceiver
PA Efficiency % @ 12vPower (W)
80m 76.6%5.06
60m 74.3%5.71
40m 75.8%6.2
30m 74%6.48
20m 76.2%5.78

I did not had much free time lately, but I do listen on the (tr)uSDX every time I’m at the desk working on my laptop. I also made my very first QSO’s on this TRX. So for sure I will remember it all my life. The overall opinion is that it’s worth having one. Even if you have fancy and expensive equipment to use, it’s still great to have one for portable work on HF. It’s so tiny it fits in your pocket. The fact that you can also power it from a USB battery pack it’s a plus. Even if the power is only 500mW. Basically is a handheld transceiver for HF.

I wanted to use it for digital modes as well, so I was really happy to realize I can also do that as well. So far I’m still learning about FT8 and similar modes. I also received a lot of SSTV images too. When I will feel ready, for sure I will do some QSO in digital modes as well. It also has CAT control that goes really well with all sort of software. For me the CAT control was great when using Log40M2, as I didn’t had to input the frequency all the time in the log. The software will always autocomplete those fields with the info from the transceiver.

If 5W are not enough for you, you also have great options to connect an external PA. I know for sure that on my wishlist is the JUMA PA-100D Linear Amplifier at 100W. That one will also be perfect for other QRP HF transceivers I may buy or build.


I wanted to talk about this in particular, because I know that many people that didn’t really followed the development of the TRX complained about. The (tr)uSDX QRP Transceiver did not had that speaker at first. The one that comes now with the transceiver, it’s nothing but an emergency speaker that was added as an extra option in the last minute. It’s not excellent for sure, but it’s way better than having no audio at all. If you don’t raise the volume over 10-11 you should have a decent audio for sure with no issues. If you ever go out for some portable work and you forget your headphones or amplified speaker, you will end up loving that little speaker.


I will not go into the programing side as I don’t know much about that. I don’t like programing anyway. As I was saying, I prefer analog equipment. But I do appreciate very much the fact that they managed to get so much, out of such a small and simple processor. There are only three things I didn’t like. I do understand the reasons behind the choices made though, so I’m not actually complaining about it. First is the SMA connector, as I would always prefer a straight BNC instead. I do understand the space limitations in that little package.

The second thing is the use of the USB connector. A USB C would be great for the future since it seems to become an international standard for the phones as well. Right now in my area, the other types of USB cables simply disappeared. Everywhere I go, they only seem to have USB C. I guess I will end up ordering one online.

The last one is the power connector. I know that also because of the space limitations is harder to use a 6mm one that is more common for most power supplies or battery packs. It took me a little convincing work, but at the end I manage to replace the power connector with a 6mm one. I know many people would like this too.

Improvements in developing come with a lot of hard work and money spent for parts to test things. So if you like this little TRX and you want to support Manuel and Guido for their hard work, feel free to do so down below.

Down bellow you have the first video I made about the (tr)uSDX QRP Transceiver. Trust me there will be a lot more coming in the future. If you have it, or if you will order one… I hope you enjoy it as much as I do.



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