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The QMX+ Internal ATU / Battery / Speaker Mod by AC8L is an all-in-one internal expansion system for the QRP Labs QMX+ that adds a compact automatic antenna tuner, internal lithium battery support, and integrated speaker functionality in a rugged portable format. Originally designed by Sardar AC8L, the project combines portability and field convenience into a single integrated package for QRP operators. Additional technical specifications, firmware information, and open-source project files are available through the AC8L GitHub Repository, with active development discussions and community support found on the QRP Labs Groups.io Community.
These kits are intended for builders with varying soldering experience levels, from complete DIY assembly to nearly fully assembled units. All kits include the PCB set and required components unless otherwise noted.
General Product Overview:
The AC8L ABS V2 system transforms the QMX+ into a highly portable self-contained field radio by integrating:
• Internal automatic antenna tuner (ATU)
• Internal speaker system
• 3-cell 18650 lithium battery support - uses nonprotected button top cells
• Compact integrated form factor
• Open-source hardware and firmware ecosystem
• Community-supported ongoing development
Designed specifically for portable QRP operation, POTA, field deployment, and emergency communications, the ABS V2 provides a clean internal solution without requiring multiple external accessories.
To keep shipping costs down: 18650 batteries are user supplied and not included in the sale.
95% Build Kit – Fully Assembled & Programmed — $235.00
This premium version is nearly ready to install and operate. All SMD and through-hole components are professionally installed, and the PIC controller is pre-programmed and tested.
Features:
Fully assembled PCB set
PIC pre-flashed with firmware
ATU, speaker, and battery boards assembled
Minimal final assembly required – you will need to solder four headers to your QMX+
Ideal for operators with limited soldering experience
Perfect for users who want the convenience of a near turnkey solution while still enjoying the flexibility of the open-source ABS platform.
75% Build Kit – Through-Hole Assembly Required — $210.00
All surface-mount components are professionally installed, and the PIC controller is pre-programmed. The builder completes the remaining through-hole component installation.
Features:
All SMD components installed
PIC pre-flashed
Through-hole parts require soldering
Excellent balance between cost savings and simplified assembly
Recommended for builders comfortable with standard through-hole soldering but who prefer to avoid fine-pitch SMD work.
50% Build Kit – Partial Assembly Required — $195.00
This version is intended for intermediate builders who are comfortable installing larger components and relays.
Features:
PIC pre-programmed
Builder installs:
Through-hole components
Large SMD capacitors
15 Mosfets & 1 Diode
Relay components
Lower assembly cost with more hands-on building experience
A great option for hobbyists who enjoy the assembly process while avoiding PIC programming requirements.
0% Build Kit – Complete DIY Kit — $175.00
The full builder experience. All components are included, but no assembly or programming has been completed.
Features:
Includes all SMD and through-hole components
PIC requires programming by the builder
Complete assembly required
Lowest cost option
Maximum flexibility for experimentation and customization
Ideal for experienced kit builders and experimenters who want the full hands-on construction experience.
Important Notes
The ABS V2 project remains in active community development.
This ATU is based on the ATU-100 architecture and experiences many of the same operational limitations associated with that tuner design.
Due to tuning performance limitations on the higher HF/VHF spectrum, it is recommended that the ATU be bypassed or taken out of line when operating on the 10 Meter and 6 Meter bands.
Performance characteristics and firmware improvements continue to evolve through ongoing community testing and experimentation.
Builders are encouraged to review the AC8L GitHub documentation and QRP Labs Groups.io discussions before assembly and operation.
18650 Cells us a nonprotected button top cell ~ users can modify for protected cells by replacing the cell holders.
The ABS V2 is manufactured for use with an external RF jumper connection between the QMX+ and the ATU assembly using SMA connectors.
Advanced users may choose to modify the system to internally reroute the RF signal path and bypass the external SMA jumper arrangement; however, components and parts required for internal RF routing modifications are not included with the kit.
As with many experimental/open-source amateur radio projects, some tuning and operational experimentation may be required depending on antenna type, operating band, and station configuration.
Xiegu G90 20W HF SDR Transceiver with Built-In ATU
20 Watts. Built-In ATU. SDR Performance. Ready for the Shack or the Field.
The Xiegu G90 is a compact, full-featured 20-watt HF amateur radio transceiver built around a modern Software Defined Radio (SDR) architecture. With an excellent RF front end, built-in wide-range automatic antenna tuner, detachable control head, spectrum/waterfall display, and adjustable DSP filtering, the G90 packs an impressive amount of capability into a portable radio.
Whether you're building a home station or heading out for POTA, portable, mobile, camping, or emergency communications, the G90 offers significantly more capability than a typical QRP rig while remaining small enough to take into the field.
Key Features
Up to 20 Watts RF Output
0.5–30 MHz General Coverage Receive
160–10 Meter Amateur Band Transmit Coverage
Modern Zero-IF Direct Conversion SDR Architecture
USB / LSB / CW / CWR / AM / FM Modes
High-Performance RF Front End for excellent selectivity
Built-In Wide-Range Automatic Antenna Tuner
Built-In Antenna SWR Scanner
Built-In CW Decoder
Adjustable DSP Bandwidth Filters — CW filtering adjustable down to 50 Hz
1.8" High-Brightness Color TFT LCD
±24 kHz Fast-Scan Spectrum Display with Waterfall
Detachable Front Panel / Display Head
I/Q Output for interfacing with a PC or compatible adapter
Built-In Medium-Wave / AM Broadcast High-Pass Filter
10 Hz Minimum Tuning Step
Factory-Installed Anderson Powerpole DC Connectors
A Great Step Up from QRP
At up to 20 watts, the G90 fills an excellent niche between traditional 5–10 watt QRP radios and larger 100-watt HF transceivers.
That extra RF power can make a noticeable difference under marginal band conditions while still allowing you to build a compact, battery-powered portable station.
The G90 is particularly well suited for operators who want one affordable HF radio that can work equally well on the operating desk or packed up for a weekend POTA activation.
Wide-Range Automatic Antenna Tuner
One of the G90's standout features is its built-in wide-range automatic antenna tuner (ATU).
The integrated tuner provides convenient antenna matching without requiring a separate external tuner for many antenna systems — a major advantage when putting together a compact portable station.
The radio also includes a built-in SWR scanner, allowing operators to quickly evaluate antenna performance across a selected portion of a band.
Spectrum & Waterfall Display
The detachable control head features a 1.8-inch high-brightness color TFT display with a real-time ±24 kHz spectrum scope and waterfall.
This provides a quick visual representation of band activity and makes locating active signals considerably easier than operating from a conventional frequency-only display.
Adjustable DSP Filtering
The G90 includes adjustable digital signal processing filters that allow operators to tailor receiver bandwidth for operating conditions.
For CW operation, the filter can be narrowed to approximately 50 Hz, providing excellent flexibility when working crowded bands or weak signals.
Detachable Control Head
The G90's front display and control panel can be separated from the main radio body using a remote cable.
This makes the G90 especially useful for mobile installations, compact operating desks, portable stations, and custom go-box installations where the radio body and controls cannot conveniently occupy the same location.
Digital Modes & CAT Control
For operators interested in FT8, JS8Call, other sound-card digital modes, or PC CAT control, the optional Xiegu DE-19 Data Interface Expansion Adapter is required.
The DE-19 combines a USB sound card and isolation transformer into a single interface, providing a convenient connection between the G90 and your computer.
Xiegu DE-19 Data Interface is sold separately.
Power & Operating Notes
For full 20-watt output, use a properly regulated DC supply in the 13.8–15V range with adequate current capacity. Although the G90 can operate over a wider 10.5–16.5V DC input range, maximum RF output may be reduced at lower supply voltages.
Like many compact HF transceivers, the G90 can become quite warm during extended operation, particularly during high-duty-cycle transmissions such as digital modes. Adequate airflow around the radio is recommended. An optional cooling stand or fan system can be useful for extended high-duty-cycle operation.
A slight internal tone or noise may occasionally be noticed as the radio becomes warm during extended use. According to the manufacturer, this heat-related internal signal noise is normal and does not affect radio performance.
Pair your G90 with a quality power source, portable antenna system, and the optional DE-19 interface to build a highly capable compact HF station for the shack, campsite, or your next activation.
“Let’s Keep America Working. Proudly built in New Jersey using USA-made plastics from North Dakota, Indiana & Texas, by dedicated hams and outdoor enthusiasts.”
Designed for portable operators, field deployments, POTA activations, emergency communications, and off-grid use, the OK1HRA ~ CQ Homestead Supply QMX+ Extreme Rugged Case provides serious protection for your QMX+ transceiver while maintaining a compact and functional field-ready design. Made with USA manufactured PCTG/PETG plastic’s.
This rugged enclosure system is based on the original design work of amateur radio operator Dan Pech, Callsign OK1HRA. CQ Homestead Supply is proud to offer this design with permission from Dan while continuing to support the growing QMX+ portable operating community.
These rugged cases are compatible with the QCX line of radios, but a 60mm rear lid is needed to clear the longer BNC connector.
Complete Kit: $85.00
Built for real-world field use, each case includes:
Top Lid with embossed QMX+ logo
Main Body for QMX radio
16mm deep Rear storage Lid (Black)
Two Sling Mounting Clips
Standard colors: Black, Gray, Tan, Flat Dark Earth, Coyote Brown, OD Green, Mil. Green, Red, Blue, Teal, Neon Green, Orange, Yellow, Pink, Tool Box BLue
If you would like: Top Lid, Main Body and Rear Lids to color match, email use and we can provide you with a time quote.
OPTIONAL REAR LID’S
60 mm deep Rear storage Lid (Black) $25.00 ((Required for use with QCX radios))
100 mm deep Rear storage Lid (Black) $35.00
150 mm deep Rear storage Lid (Black) $45.00
Note: All models include black latches & mounting points regardless of body color selection. Rear lids are also black.
Perfect for:
POTA Activations
SOTA Operations
Emergency Communications
Field Day
Backpack Portable Operation
Off-Grid Deployments
Travel Protection
Note: Surface Blem Models $65.00
These units contain cosmetic production defects affecting surface appearance only. Structural integrity and functionality are not affected.
A great lower-cost option for operators who prioritize performance over cosmetics.
OPTIONAL BLEM REAR LID’S
60 mm deep Rear storage Lid (Black) $20.00 ((Required for use with QCX radios))
100 mm deep Rear storage Lid (Black) $30.00
150 mm deep Rear storage Lid (Black) $40.00
Note: Radio not included with case.
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From amateur radio gear and electronics to homestead supplies and field equipment, we provide the gear and provisions that keep you connected and ready for adventure.
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