Malahit tr usdx transceiver 5-Band usdx Multimode QRP Assembled with case by PE1NNZ and DL2MAN

Remember this is a QRP rig easy 4watts, sensitive receiver, built in keyer, Morse decoder, speaker is small..quality of audio from speaker is poor, earphone much better. Transmitted audio acceptable. CW keyer works well. As with most new computer controlled devices all changes like power, volume , rate of tuning, cw speed, band changing..all require multiple pushes of buttons to arrive at your choice in the Menu. But it is a fun tiny little efficient rig. I love it.

UPDATE: It is now a year and a half later from date of purchase and in addition to a fun little CW rig, it plays well on FT8. I am using the .200i software that comes with it, an easy connection to a PC laptop with WSJT-X and GridTracker on the side makes a nice digital mode rig. A 5 Watt multi-mode, multi-band transceiver for a modest investment. ORIGINAL 4 STAR REVIEW: A nice experiment in cramming a multi band transceiver into a package the size of a pack of cards… It will do SSB but I am a CW guy and this thing is fun to use. Receiver is sensitive enough. Worked a VK from AZ this morning on 20M with a chunk of wire off the balcony. I also have a QCX+ for 20M. Both have strengths and weaknesses but for a palm of hand radio you can stuff in a shirt pocket along with a wire antenna this one is pretty hard to beat…

I take back my earlier review. Today I connected it to a Chameleon Whip antenna and an SWR/Power meter. The meter showed a little over 4 watts and an SWR of 1.0 and I made multiple POTA hunter contacts on 20 meters USB with good signal reports. This little unit works great and is worth the price. Once you figure out the menus it is easy to operate. Works better if you lower the bandwidth as it is wide open unless you change the settings. I use it with a small BlueTooth transmitter and a headset as the audio is not the greatest. Haven't used it on CW yet as i need to improve my skillset.

There's not much I can say that that the other positive reviews haven't covered about this unique little radio, but I'll try to add my personal take: This is an SDR implemented in an Atmega328 MCU. If you're unfamiliar with the 328, look up up the specs and blow your mind with this marvel of coding prowess. I purchased this radio to experiment with regional Reticulum HF links using NVIS on the 6 and 13MHz ISM bands. The radio produces 0.5W from 5V USB power, and field strength tests indicate that the ERP from my very compromised antenna are within legal limits. A zener diode across the RF output will protect the finals from high SWR. This would've been a nice design addition, but it's a low-skill fix. An explanation was posted to the truSDX forums, and a tutorial can be found on YouTube by searching for "Easy SWR Protection for (tr)usdx". I recommend getting some inexpensive USB-C to micro-USB adapters, and keeping a few with the radio. Micro connectors tend to wear out and being able to use standard "C" cables for everything is invaluable. Cons: As stated above, I wish the radio had a USB-C connector. This isn't actually a truSDX design flaw, since the radio simply exposes the USB connector on the MCU it's built on. Turning the volume to "16" causes self-oscillation; don't do it. And don't expect much from the built-in speaker. Use an external speaker or headphones. Overall: This radio isn't for everyone, but it's an awesome, compact piece of tech that'll get you on the air at an irresistible price point. If you're an experienced HF operator and/or looking to get into QRP on the cheap, it's a fun rig.

The one I received didn't work. Trying to adjust frequency step results in the thing switching to CW mode and the enter key not working at all. Combing through the menu items results in the unit randomly switching bands. Try to adjust the volume and the unit switches frequencies. PTT button sometimes functioned. Total junk. If you want something that works, don't buy from this distributor. It's total garbage.

The radio works but I can't see the display well enough to use it. Is there an computer app and connecting cable to bring it to life for me?

The tr uSDX 5-Band multimode QRP transceiver assembled by PE1NNZ and DL2MAN is a very well-executed uSDX build. Receiver performance is sensitive and stable across all five bands, with clean audio and effective filtering for a compact SDR. CW operation is smooth, and frequency stability is good once warmed up. Transmit output is consistent across bands, and on-air reports confirm a clean signal with no noticeable key clicks or excessive IMD when properly adjusted. Multimode operation works reliably for SSB, CW, and digital modes. Build quality is excellent, with a neat internal layout, solid case, and low power consumption—making it an ideal QRP and portable rig. Highly recommended.

Une vrai machine! Je pense m’en procurer un deuxième !

Fast shipping and great build quality. I recommend!