[bars] Fwd: [JS8Call] QRP Labs QDX 4-band 5W digi-modes transceiver kit is back in stock

[William Smith]

Some of you may remember the QDX 4-band 5W transceiver kit from QRP-Labs that sold out in minutes the last couple of times it became available.  I bought one of the V1 boards and was very impressed, until a firmware error blew it up and then I was very sad.  Ran FT8 and JS8Call flawlessly while it lasted.  Yes, the firmware issues were fixed months ago.

They got anough parts for a couple of thousand of them, and they've just gone on sale, see below:

73, Willie N1JBJ

From: "Hans Summers" <hans.summers at gmail.com>
Subject: [JS8Call] QRP Labs QDX 4-band 5W digi-modes transceiver kit is back in stock
Date: May 1, 2022 at 2:57:09 PM EDT
To: js8call at groups.io
Reply-To: js8call at groups.io


Hi all

After 5 months of searching for components, substitute components, and re-designing some sections to suit the substitute components - the QDX kit is now back in stock again, price $66, see http://shop.qrp-labs.com/qdx <http://shop.qrp-labs.com/qdx> 

A key feature of QDX is very high performance - both on receive due to the 24-bit ADC and carefully crafted SDR; and on transmit due to the unique combination of built-in USB soundcard and measuring the audio tone from the PC software, then commanding the TCXO-locked PLL to that frequency - resulting in accurate transmissions with zero unwanted sideband or residual carrier or splatter, always. CAT control for easy use with WSJT-X etc. 

The Rev 3 PCB design changes actually improve the noise floor by 6dB (see attached; test condx, -60dBm calibrated signal source on 7MHz; gain adjusted so it appears as -60dB FS when recorded on the PC in Audacity; Audacity's Plot Spectrum in Hanning window mode and 8192 points with a 48ksps recording). 

The Rev 3 PCB batch design changes also add a PTT output connector (3.5mm jack) with active-low grounded, as well as +5V active output signals (configurable). There are new pads on the PCB for ground control outputs and 

Features:
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 <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
PTT output connector (active grounded, or active high +5V)
QFU firmware update for lifetime free firmware udpates, easy installation on any PC without drivers, software or hardware e.g. programmer
Optional aluminium extruded cut/drilled/laser-etched black anodized enclosure (88.6 x 63 x 25 mm)
73 Hans G0UPL
http://qrp-labs.com <http://qrp-labs.com/>
https://www.buymeacoffee.com/g0upl <https://www.buymeacoffee.com/g0upl>
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