qcx20m

Feature List:

Four bands 80, 40, 30 and 20m
Also works well on 60m, see John AE5X measurements https://ae5x.blogspot.com/2021/11/spectrum-analysis-qdx-on-60m.html
5W output at 9V supply (can be built for 4-5W at 12-13V supply)
Single signal transmission (zero unwanted sideband, zero residual carrier, zero intermodulation distortion)
Solid-state band switching and transmit/receive switching under CAT control
High performance embedded SDR SSB receiver with 60-70dB of unwanted sideband cancellation
Built-in 24-bit 48ksps USB sound card
Built-in USB Virtual COM Serial port for CAT control
Si5351A Synthesized VFO with 25MHz TCXO as standard
Easy to build single-board design, Professional quality double-sided, through-hole plated, silk-screen printed PCBs
All SMD components factory assembled
Connectors: 2.1mm power barrel connector, USB B (for audio and CAT control), BNC RF input/output
Built-in test signal generator and testing tools
Receive current 100mA, Transmit current 1.0-1.1A for 5W output with 9V supply (around 0.7A for 5W with 13V supply).
I-Q output mode if you wish to use a PC SDR program for demodulation rather than the internal SDR
QFU firmware update for lifetime free firmware updates, easy installation on any PC without drivers, software or hardware e.g. programmer
Optional aluminum extruded cut/drilled/laser-etched black anodized enclosure (88.6 x 63 x 25 mm)

A month or so back, I ordered a QDX transceiver and built it. Took me roughly 5 hours, of time sitting at the bench a little at a time.

I have tested the rig on my inverted Vee on all four bands, and it works ok, but best on 20 and 40 (Vee is tuned for those, and I don't have a tuner for the smaller
rigs.) I have also tested it on 20m using my home brew mag loop. I have made a couple dozen contacts on the loop on JS8 but haven't tried any other modes
this rig yet.

Winding the coils was by far the most difficult part of assembly, however, I've wound a lot of coils and I am a retired engineer and a former electronics technician
as well, so soldering and assembly for me was a piece of cake. A person having never done any assembly might have a few issues, so I would recommend
practicing winding the coils before actually doing it for the kit. But, after a few, and some experience it's not difficult.

Well, update. I fired up the QDX along with the Mag Loop I built. Works great on 20 meters. Couldn't get it to tune on lower bands (30, 40 and 80). I probably need a bit more capacitance for those bands. I don't have an analyzer or anything so calculations are all I have. As an engineer (who might be rusty these days) I should be able to make this work. :) On the bright side, I did see that a lot of stations saw me on pskreporter.net. I did make a contact with a friend of mine in Ohio, Matt, KB8UVN.... we did coordinate a bit via our chat method on packet radio. But, I am very IMPRESSED with both the QDX (which is a very small radio, physically) and the loop I made. The Loop has an extremely high Q so there is a very narrow bandwidth tuning on this thing. Anyway, I was heard from one end of the US to the other!