roWaves Technologies

Certified Company ISO 9001-2008

RF BOARD for (tr)uSDX multimode TRx

➡️  DL2MAN & PE1NNZ cancelled the license for (tr)uSDX complete product manufacturing, for many manufacturers. We have only the RF boards (assembled, tuned & tested) in stock.

The completed assembled unit (if you have the UI board) deliver min. 4W and max. 6.3W all 5 bands and min. 70% and max. 82% efficiency. Accessories available below. We sell ONLY the 80/60/40/30/20m version and we have NO PLANS to produce other versions. Statistical data with output PWR. vs. Bands vs. Efficiency, but also the official company communication on (tr)uSDX, available HERE.

➡️ Buying options?

☑️ RF board, assembled + tuned: fully functional RF board, ready for plug-and-play. The 70cm long power supply cable (ROW-CA10) and SMA to BNC adapter (CARF-7) +  SMA connector dust cap protection, included, for free, when buying the assembled RF board.

➡️ Do you need accesories?

☑️ 50Ω quality SMA-male to BNC-female adapter (CARF-7) click HERE
☑️ DC power supply cable, 70cm long, ROW-CA10 (Lumberg OD 3.4/ ID 1.4mm DC jack installed, 0.7mm red/black wire) (included in the package, for free, when buying assembled units) available HERE

➡️ Questions?

✔️ how to order: from stock
✔️ payment methods: credit card / PayPal
✔️ shipping method: DHL Express, worldwide, extreme fast delivery (usually 1-2 days all Europe) & tracking number
Price :

 48,90 (excl. VAT)

5 in stock

(*Ships in 1-2 business days. VAT amount and the exact shipping cost will be calculated during checkout.)

THESE SPECS were valid for complete assmebled units: roWaves KITs and assembled units can deliver min. 4W and max. 6.5W, all 5 bands and min. 65% and max. 80% efficiency. These parameters are obtained without “tweaking” or additional adjustement of the coils (no. of turns, turns distribution on toroid surface, LPF VNA tunning etc.). Statistical data from more than 43 assembled units can be analyzed below in the tables and in our main technical file, released some time ago, available at top of this page or at FAQ section. From a lot of 43 units, the recorded data:

Table 1.  Band [m] vs.Efficiency [%]

Band [m]>80% PA eff.70 to 79% PA eff.<70% PA eff.

Table 2. Band [m] vs. PA Power [W]

Band [m]>6W5 to 6W4 to 5W<4W

Table 3. Technical specifications:

ParameterSymbolValueUnitConditions / comments
Operating bandsFo80/60/40/30/20
RF Power LevelPo4
W min.
W max.
@5Vdc (e.g. USB powered)
PA stage efficiencyPeff.min. 65 to 80%%on all bands
Harmonic suppressionHs>-43dBor better
Side-band suppressionSsmin. 30dBmin. level
Rx Noise LevelNl-106dBor better
PA classPAcEhigh-efficiency class-E
Voltage supply rangeVdc 5-15Vdcincl. USB emergency power supply
Tx currentTX Id~500 - 700mAdc@12Vdc
Rx currentRX Id60 - 75mAdctyp.
Tunning-rotary encoder--
PTTkey--on-board PTT key (emergency key)
SpeakerSPK32R23mm integrated speaker
DimmensionsL x l X H90X60X30mmenclosed
Enclosure color-orange - lion
army - green
high quality PETG3D printed

Tech Minds review of Matt’s unit purchased from roWaves:

DX Explorer review with the unit from roWaves:

latest release! -> solutions and technical issues assessment  file (roWaves) click here

– assembly instructions: click here

– simple bootloader installation procedure (roWaves): click here

– how to install bootloader (installed in the KITs delivered by roWaves, starting B4 lot): click here

– schematic RF board: click here

– schematic UI board: click here

– how to install firmware after complete assembly & verification: click here

– user manual: click here


Q1: What are the requirements for approval of (tr)uSDX to commercial parties?

A1: for commericial parties, requirements are: 4W min. all bands, max. 6.5W all bands @ 12Vdc. Min. 80% efficiency (not clearly stated if displayed or measured efficiency is taken into account), for all bands. So:

a) roWaves units deliver: min. 4W and max. 6.5W all bands @ 12Vdc and  min. 65 to 80%, all bands, with part to part variation. Our statistical data to support these arguments: HERE (especially pages 7 to 13).

b) there are 2 (two) videos that are presenting the approval process. However, the technical requirements for approval, for efficiency and power are not fulfilled by the approved seller mentioned in videos. Arguments:

– 30m band in 1st video of approval ( does not reach min. 4W and min. 80% efficiency, out of the box, no tweaking, accordingly with the specs. Values are 2.85W @ 77 to 79% displayed efficiency. So it is a fact that efficiency varies, from part to part, but we have been requested that all our units should have min. 80% efficiency, no “exceptions”.

– in the 2nd video (, the 80m band is out of specs: 7.2W and displayed 77% efficiency @ 12Vdc, when DL2MAN request is clearly stated as max. 6.5W @ 13.8Vdc and min. 80% eff.). All showed values during approval are displayed not calculated values, as clearly shown in videos. DL2MAN intitial requests for commercial parties approval was based on assembled & tuned units (as mentioned on “Where to buy” page), but the current approval videos contain no assembled units being tested. The Rshunt value will highly influence the displayed efficiency. That parameter can be manipulated to “fulfill” requirements by any parts involved, anyone at any time. None of the approval videos are showing the real calculated efficiency, but only the displayed one. From engineering point of view, we, existing and future customers take into consideration the calculated values. We asked DL2MAN if he ever received / requested statistical data with calculated efficiency values for the units sold, from approved seller(s)? They should have that data isn’it? We also asked that to the approved seller. The answer was never received, from none of the parts, and we were banned personally by DL2MAN (you might know the story….)

Q2: Why there aren’t other EU manufacturers out there to produce (tr)uSDX? How come we are the only ones we  can not reach the min. 80% efficiency all bands? Since we have corrected ALL issues with our kits & assembled units, at BOM level and known technical challenges.

A2: we also asked that by ourselfes. In fact, we discussed with Javier, EA3GCY from because this is how companies SHOULD DO, on the same product they have challenges with.We exchaged information with him on this topic, because we started to ask ourselfes why we are the only ones that can not deliver min. 80% efficiency on this radio. His units also had this issue on obtaining min. 80% calculated efficiency @ 12Vdc, all bands. His results also varied from 65% to 75% – 78%. His report clearly states that. Also, additional comments regarding efficiency,  from Javier (he has 40+ years in amateur radio business):

– very hard to obtain 80% real calculated efficiency, at professional series production level. Arguments: difference in MOSFET transistors/lot variation, critical response of the filters in class-E designs. The BS170s should pe selected individually and each filter individually adapted.

So we, at roWaves, can not reached the so “claimed” min. calculated 80% efficiency, nor other very known manufacturer (EA3GCY), more experienced than us. Only the Chinese manufacturer can “achieve that” for now. This argument should raise a question regarding requirements isn’it? The designers, when they had this input, should have changed the requirements for manufacturing, from min. 80% to min. 70-75%. Becasue they had enough data and input. In this way, we all would be approved. Instead, DL2MAN banned us / disqualified us and accused us about many other things. Very professional indeed…

Q3: What is the future of (tr)uSDX at roWaves? What we will continue to do and stop doing?

A3.1: we will:

– continue to offer support for our kits and assembled units, 2 years EU warranty for assmbled units

– offer technical support by email and whats app for all existing and future customers of (tr)uSDX

– stop the investigation and technical changes / improvements, for this product. We have invested a lot in it (more than our competitors!)

– help any customers of (tr)uSDX, if asking help about this product, even if they did not bought the units from us

– publish all data that we have and make a transparent approach on every aspect of this product

– continue the sell units until the stocks are cleared out

A3.2: we will not:

– continue to apply for approval, as long as for manufacturers the approval process was faulty and missing a lot of important data

– we will not do more upgrades or changes on this product, we will not produce other variants of it

Additional information

Weight 150 g
Dimensions 10 × 5 × 3 cm

RF board KIT (all parts), RF board assembled & tuned


  1. YO9IYE (verified owner)

    The packaging was great, the bits and pieces were in separate bags making it very clear what goes where. Wiring the toroids is a bit tedious but in the end it’s pretty rewarding to see that your patience pays off when the radio fires up.
    One thing to remember is that the kit version <> come with any bootloader or firmware. I had to tear it apart and remove the OLED display thinking that I must’ve messed up the mod only to find out that for some reason my USBasp was failing to detect the ATmega328 because I had to set its jumper to “SLOW”. After loading the bootloader I was able to read the serial number, allowing me to download the 2.0f firmware from DL2MAN. After uploading the firmware everything was working as expected.
    I look forward for the battery case to become available as the 3.5×1.3 is not really common. DL2MAN should’ve considered using the more common 5.5×2.1 barrel even though that connector may have added 1-2mm thickness. But maybe that extra space could’ve also made room for a BNC connector.
    All in all, the little bugger is pretty amazing. Next steps – CAT control & audio wiring to one of my RPi boards that will serve as a permanent low-power always on FT8 station.

  2. Ed Schenk, NL (verified owner)

    Well packed.
    nice package neatly arranged.
    Go put it together soon.
    thanks, Ed

  3. dzarth, DE (verified owner)

    Great service and communication. Would by again. Thanks a lot!

  4. marko, FI (verified owner)

    Excellent communications, fast delivery.

  5. pasqul (verified owner)

    All perfect!

  6. Stepan Mocjak, Czech Republic (verified owner)

    Great. But timing of delivery was off and little bit more of wire will be great. Plus there was no wire for OLED.

  7. Bruce Jones, N9DBJ, US (verified owner)

    Delivered sooner than promised, all parts intact.

  8. Roy Helge Rasmussen, Norway (verified owner)

    Great service, outstanding product.

  9. Michael R., WE0H (verified owner)

    Awesome company to deal with and high-quality products. Super-fast DHL delivery and the kits were packaged well. Very happy and will purchase other Amateur Radio items in the future.

  10. Andreas Spiess, DE (verified owner)

    Everything arrived as promised.

  11. Pavol C., SL (verified owner)

    (tr)uSDX arrived in excelent conditions. Thanks for the perfect service roWaves!

  12. SALVATORE D’IGNAZIO, IT (verified owner)

    very very good, excellent

  13. Carlo Altieri, DE (verified owner)

    Super good service. Fast and reliable. Really recommend. Thanks!

  14. Bruno Schneider, DL7UN (verified owner)

    Hi everyone,

    the package arrived safely. I just checked out the kit and I love it.

    Very good work and quality, thank you very much, best regards

    Bruno DL7UN

  15. Anil Raj, SW (verified owner)

    On time, on quality. Happy customer.

  16. CTFZI Luis

    Rowaves – from amateur radio operators to amateur radio operators

    Very competent company, that listens their customers.

    All the products are verified and tested, all the packaging designed to protect the product during shipping.

    Visit their website to know more about their products and services!

  17. Paul, M0XMT, UK (verified owner)

    Just got my TruSDR kit. It looks excellent. They also threw in some Romanian sweets! Thanks Guys I will build the kit at the weekend. Looks great quality. Best Paul de M0XMT

  18. daryla (verified owner)

    On time, well packaged, good online docs,looking forward to the build

  19. tombox (verified owner)

    Since I was informed, that there was a waiting time, everything went as expected. Contact at rowaves was kind and helpful.
    73 de HB9SFG

  20. Linas Balsys (verified owner)

    I’m glad one more EU company started selling Ham Radio kits!

    I have purchased a (tr)uSDX transceiver kit from the roWaves and am quite satisfied! The waiting time was as announced, the shipping also timely, it took just few days for parcel to come to Lithuania from Romania by DHL. The kit has been nicely and reliably packed, no damage for parts and components. The kit I bought is becoming very popular in Europe, so I am especially happy that the company from the EU country has started selling this kit, which is based on the open source and has been created and designed by other European hams. I wish the roWaves good luck in competition with the Chinese makers who are also starting producing the same kit under the same license. I personally would always choose European dealer even if a bit more expensive against the Chinese in order to avoid all this trouble with customs,taxes and long shipping times. Thanks and 73! Linas LY2BHP

  21. Harri Sillanpaa

    fast delivery, well assembled.
    thanks a lot

  22. Bruno Ruesch

    Top service. Everything worked perfectly. Many thanks

  23. Dieter DL1DBY (verified owner)

    Everything as expected. Kit arrived in time. Very good! vy 73!

  24. Marc Pressman (verified owner)

    Excellent service, and item was shipped exactly when promised. I was kept informed about shipping status and told when delivery would occur.
    It arrived in good order, with no damage from shipping. Good job!

  25. Dirk Handzic (verified owner)

    Kit looks good. DHL took a long time to deliver as usual in our area.
    Looking forward to build the kit 🙂

  26. Tim Schmitz (verified owner)

    everything ok

  27. Juan Manuel Arcauz Diaz de Gar

    Good communication.

  28. Dmitry Shvetsov RA1ZA (verified owner)

    Some time ago, I ordered a (tr)uSDX transceiver from roWaves Technologies. The first thing that pleasantly surprised me in the work of this company is that they always answer your questions, unlike many other similar enterprises. They answer quickly and competently, whether it concerns technical issues or issues related to payment, shipping, etc.
    The roWaves Technologies team really makes it clear that the customer is important to them. So far, my transceiver is still on the way and I have not tried it in operation, but I am 100% sure that the attentive attitude to customers and to their work is what this company is based on.
    I am sure the transceiver is assembled and tuned properly. Later I will supplement my review with real impressions of the transceiver’s operation. Thanks guys, and good luck! 73 de RA1ZA

  29. Allan EA3HSO (verified owner)

    All good! Box came in time, kit looks beautiful.
    Trying to find time to sit and finish it.

  30. Gorka Gomendiourrutia (verified owner)

    No problem on all orders placed. I have learned a lot in your resources tab.
    Very good RF company.

  31. VV in Idaho (verified owner)

    Very nice packaging. Everything needed for the kit was included. Nothing was going to get broken with the way it was packaged. They made a deliberate effort to get everything right before shipping. The shipping was fast. The package arrived when they said it would.

  32. dl5if (verified owner)

    all Ok, works well.
    3th harmonic > 45dB , only the pwr/swr meter shows to much…
    73 de dl5if-Ralf

  33. Ignacio Cascante (verified owner)

    It was a pleasure buying in this shop.
    Package arrived safely in my town and was delivered well packaged to avoid any damage. Parts according to spec and all looking good. Now I need to build the kit and fire it!
    Thanks also for a good communication and your response on whatsapp.
    73 de EA2BD

  34. Jose

    Kit trUSDX received in time and form as stated at web page. I know you are working for improving the efficiency of the kit, along with authors of the design. Sure you’ll be successful.

  35. Josh Nass, HRCC, KI6NAZ (verified owner)

    Great product, shipping in scheduled window. Order info updated. Nice work.

  36. Marc Pressman

    Excellent service, and item was shipped exactly when promised. I was kept informed about shipping status and told when delivery would occur.
    It arrived in good order, with no damage from shipping. Good job!

  37. Jim Plowman, F4WBZ (verified owner)

    Thank you for your excellent service & attention 73 de jim

  38. Rod Wilkinson (verified owner)

    Excellent fast processing of order, including rapid responses to emailed request for callsign inclusion and required colour of case for my (tr)uSDX.
    Extremely prompt delivery of rig, very well packed. Now enjoying learning how to use it and have had a very enjoyable CW QSO on 40m, an interesting piece of with fantastic online and supplier support. Many thanks.

  39. Derek

    Good service an understanding about shipping cost from Europe

  40. F. Javier Bartolome Conde, EA4TK (verified owner)

    Simply,amazing service, quick communication and testing the item very well!
    A must !!

  41. John Geddes (verified owner)

    Unit arrived on time and was well packaged. Delighted with the (tr)uSDX transceiver.

  42. M0DQW, Matt Miller from TechMinds YouTube Channel (verified owner)

    Great service all round, fast delivery and great communications! Would have no hesitation purchasing from roWaves again in the future. Thanks! Matt, M0DQW

  43. Martin R.

    I recently ordered from Germany. Everything went smoothly, quickly and without complications. The items were already with me three days alter payment. Well packaged and complete. I would order here again at any time.

  44. SJW1973

    I ordered my Trusdx kit late on Friday and it was delivered Wednesday morning excellent service and delivery time. I contacted Andrei to ask a couple of questions and he responded almost immediately a really helpful person. This is the true spirit of amateur radio and I’ll definitely use Rowaves again.

  45. HB9JOI, Jens Spiess (verified owner)

    Very satisfied …

  46. Han Halewijn, PH0HAN (verified owner)

    Fast delivery. Up till now everything is as expected. Will write a product review after playing a little bit more with the product.

  47. Michael R., WE0H (verified owner)

    Awesome company to order from. Customer service is excellent. The products they manufacturer and sell are well supported and of very high quality. Prices are excellent and shipping is crazy fast. 3 days from Romania to Florida USA.

  48. Arvid Holestol (verified owner)

    I am very satisfied with the purchase from
    this company , very fast delivery of the ordered items , I recommend to buy from this company

  49. Robert Head, G4XBW (verified owner)

    Well at this moment i was shocked at how quick it came,and as i have only just

    unpack it and i must say it was nicely packed.i have not built it yet so i cannot
    give you a comment on the product. yours Bob Head G4XBW

  50. John Putnam, AC9UV (verified owner)

    I received the (TR)uSDX and have it working. The sales support from the company was very good, including personal help when I had trouble ordering. The kit is well done and the experience very positive. I’ll be looking at RoWaves for other projects.

  51. Rick AI7JN

    Bought the (tr)uSDR assembled. Shipping was fast and the radio works great! Customer service was prompt and courteous. Mine didn’t show the serial number when received, but I sent an email asking for it and they replied immediately. I am very happy with the purchase and customer service. I made my first contact today on the noon net from southwet Oregon and they heard me clearly at 5 watts! This little radio is crammed full of features!

  52. Frank DD5MA (verified owner)

    I have two units, one from approved chinese seller and one from roWaves.
    I measured the power and efficiency on both units and roWaves is 10 – 20% better than approved chinese seller.
    Please go on!

  53. Jake AG3J (verified owner)

    RoWaves is one of the most honest and sincere companies I have have ever had the pleasure to buy from. It is a real shame the tr(uSDX) project is being discontinued. Business is business, everyone needs to make a profit. I understand the tr(uSDX) still had a lot more R&D work to be done and they were operating at a loss producing this product.

  54. Rodjo, HB9FUR (verified owner)

    Very good workmanship, super fast delivery, packaging very neat. I will come again. 73, Rodjo HB9FUR

  55. Mark Thirkettle, M7OCM (verified owner)

    Excellent from start to finish. Plenty of communication during the process and delivery to GB in 48 hours.

    Up and running in minutes Thank you Rowaves, M7OCM

  56. yo3hsr (verified owner)

    Just ordered the second assembled (tr)usdx together with a DS-05 dongle today.
    Very well put together and excellent customer support.
    Thank you roWaves!

    73, YO3HSR

Add a review

We use cookies to give you the best online experience on this website, by agreeing to accept their use here, in accordance with our policy.

Privacy Settings

When you visit any website, this can store or retain information in your browser, normally used as cookies. You may limit or control these personal cookie services here.

    Your Cart
    Your cart is empty
      Calculate Shipping

      Hi there,

      please choose one of our colleagues below, to request the information you need, or send us an email to You can also use the contact form on the "Contact" page. We are available ONLY  Monday to Friday, from 9-17h. Thank you!