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

Sun May 1 15:56:08 EDT 2022

Think I'll buy one! I wonder if it can do CW with any of the apps?

73 Jim K1IR

On Sun, May 1, 2022 at 3:26 PM William Smith <w_smith at compusmiths.com>
wrote:

> 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
>
> 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
>    - 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
> https://www.buymeacoffee.com/g0upl
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