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Improve Display Visibility Wherever You Operate
The CQ Homestead Supply QMX+ Sun Shade is a lightweight, field-ready accessory designed to improve display visibility during outdoor operation. Whether you're activating a park, summit, beach, campground, or operating from your backyard, direct sunlight can make the QMX+ display difficult to read. This simple clip-on shade helps reduce glare and improve screen contrast, making it easier to monitor your radio without constantly repositioning yourself or the radio.
Designed specifically for the QMX+ aluminum enclosure, the sun shade slides securely over the exterior housing without requiring modifications, hardware, adhesives, or tools. The wrap-around design provides protection from overhead and side-angle sunlight while maintaining full access to all controls, connectors, and front-panel functions.
Manufactured using durable 3D-printed materials, the sun shade adds minimal weight and bulk while providing a significant improvement in daytime usability.
Features
Designed specifically for the QMX+ / QCX+ aluminum enclosure
Slides over the exterior housing for quick installation and removal
Improves display visibility in bright sunlight
Helps reduce screen glare and reflections
Full access to knobs, buttons, jacks, and controls
Lightweight, durable 3D-printed construction
Ideal for POTA, SOTA, Field Day, camping, and portable operations
Compact design stores easily in your go-kit
Perfect For
Parks On The Air (POTA)
Summits On The Air (SOTA)
Field Day operations
Portable and expedition stations
Camping and outdoor operating
Emergency communications deployments
Built by Operators, for Operators
The best accessories solve real operating problems. The CQ Homestead Supply Sun Shade is a simple addition that makes a noticeable difference when operating outdoors, helping you spend less time fighting screen glare and more time making contacts.
CQ Homestead Supply — Practical Accessories for Real-World Portable Radio Operations.
Improve Your Operating Position
The CQHomeSteadSupply.com QMX+ / QCX+ Desktop Operating Stand is designed to enhance comfort and visibility during extended operating sessions. Whether you're working a POTA activation from home, chasing DX, or spending an evening on FT8, this stand elevates and angles your QMX+ for a more natural viewing and operating position.
Designed specifically for the QRP Labs QMX+ / QCX+ aluminum enclosure, the stand raises the front of the radio while maintaining a stable, secure platform that looks right at home in any ham shack.
Features
Custom designed for the QRP Labs QMX+ / QCX+ aluminum enclosure
Angled viewing position improves display visibility
Front elevated approximately 2.25" (50 mm ±)
Rear elevated approximately 0.5" (11 mm±)
Integrated rear retention lip prevents movement during operation
Durable 3D printed construction using quality Black PETG
Embossed CQHomeSteadSupply.com branding
Non-slip rubber feet on underside
No modification required to your radio
Built for Real Operators
The stand's ergonomic angle makes it easier to view the display, adjust controls, and operate the radio during long sessions. The lightweight yet rigid design provides excellent stability while keeping your QMX+ securely positioned on your desk, workbench, or operating table.
Perfect For
Home stations
Portable operating setups
POTA activations
SOTA planning stations
Digital mode operation
CW and SSB operating positions
Specifications
Compatible Radio: QRP Labs QMX+ and QCX+
Material: Black PLA
Radio Footprint: 150mm × 106mm
Give your QMX+ or QCX+ the operating position it deserves with a purpose-built stand designed by hams, for hams. The result is a cleaner shack, improved ergonomics, and a professional appearance that complements the rugged styling of the QMX+.
Original Design by Dan, OK1HRA • Printed by CQ Homestead Supply with Permission • PETG • Builder Project
Add a compact CW paddle directly to your OK1HRA Rugged Box with this 3D-printed paddle and mounting set.
This unique single-paddle CW key was originally designed by Dan, OK1HRA, and CQ Homestead Supply is proud to produce and offer these printed components with Dan's permission.
Our standard version includes the OK1HRA Key #5 design along with the base needed to mount the paddle directly to the Rugged Box, making it an excellent addition to a compact QMX/QMX+ portable operating station.
What You Receive
This product includes:
OK1HRA Key #5 3D-printed paddle
3D-printed Rugged Box mounting base
Wire, Srews and Jack
Printed in durable black PETG
Other OK1HRA mounting configurations available by request
IMPORTANT – Printed Parts Only
This is NOT an assembled CW paddle.
CQ Homestead Supply supplies only the 3D-printed plastic & components to build.
Designed for the OK1HRA Rugged Box
Our standard configuration combines Key #5 with the Rugged Box mounting base, allowing the completed paddle to be mounted directly to the Rugged Box.
This creates a compact CW operating setup particularly well suited to the QRP Labs QCX, QMX+ and QMX without requiring the operator to carry a separate full-size paddle.
It's a great option for:
POTA
SOTA
Field Day
Portable QRP
Camping
Backpack radio
Field communications
Home-built and experimental radio stations
Printed in PETG
CQ Homestead Supply produces these components in black PETG for improved durability and temperature resistance compared with many basic PLA prints.
This makes the printed components well suited to portable radio equipment that may spend time in field boxes, vehicles, backpacks, and outdoor operating environments.
Other Mounting Options Available
The Rugged Box mounting base is our standard configuration, but it isn't your only option.
Other mounting configurations from Dan's original design can be printed by request.
Contact CQ Homestead Supply if you would like a different mounting arrangement.
A True Amateur Radio Builder Project
This product is intended for amateur radio operators who enjoy building and customizing their own equipment.
CQ Homestead Supply provides the professionally printed components, while you supply and assemble the remaining hardware and electrical components needed to complete your paddle.
The result is an exceptionally compact CW paddle that can become an integrated part of your portable QRP station.
Credit to the Original Designer
The Single CW Paddle and associated designs are the original work of Dan, OK1HRA.
CQ Homestead Supply produces and sells these printed components with permission from Dan, OK1HRA.
We are pleased to support Dan's work and make his designs more readily available to amateur radio operators who may not have access to their own 3D printer.
Please Note
This product is sold as a 3D-printed builder component set only.
Assembly is required.
Original Design: Dan, OK1HRA
Printed and offered by CQ Homestead Supply with the designer's permission.
CQ Homestead Supply — Equipment for operators who actually get out and use their gear.
Here is your chance to build your own -24db Microphone. The Kit contains all the parts needed to assemble your own microphone.
The kits come in two color choices: Flat Black or White
The CQ Homestead Supply Premium QMX+ Microphone was designed from the ground up to improve comfort, usability, and audio performance for portable QRP operators using the QRP Labs QMX+ radio platform.
Unlike many compact aftermarket microphones that can feel cramped during long operating sessions, this design features a larger ergonomic housing that is easier to grip and operate during POTA, SOTA, field day, and portable operations. Whether you are wearing gloves, operating in cold weather, or simply spending hours activating a park, the improved form factor provides a more comfortable and natural feel in the hand.
At the center of the design is the recommended PUI Audio AOM-5024L-HD-R analog electret microphone element, delivering clear and consistent transmit audio performance with a -24 dB sensitivity rating optimized for QRP voice communications.
Features
Premium PUI Audio AOM-5024L-HD-R microphone element
-24 dB sensitivity for clean voice audio
Oversized PTT button for easier operation in the field
Enlarged ergonomic housing for improved comfort and grip
Lightweight and compact portable-friendly design
Designed specifically for QMX+ and QMX radios
Ideal for POTA, SOTA, field operations, and portable HF use
Comes complete with an ultra flexable 3.3 feet / 1 meter 3.5mm audio cable
Unit is not glued, is fasten together with a screw for easy maintenance
If you would like a custom color to match that new Rugged Case, email us for a quote.
Designed by Operators, for Operators
Every microphone is kitted by CQ Homestead Supply with a focus on rugged field usability and long operating comfort. This is not just another small handheld mic — it is a purpose-built upgrade for serious portable QRP operators.
Let’s Keep America Working. Proudly built in New Jersey by dedicated hams and outdoor enthusiasts.
Original Design by Dan, OK1HRA • Printed by CQ Homestead Supply with Permission • PETG • Builder Project
Add a compact CW paddle directly to your OK1HRA Rugged Box with this 3D-printed paddle and mounting set.
This unique single-paddle CW key was originally designed by Dan, OK1HRA, and CQ Homestead Supply is proud to produce and offer these printed components with Dan's permission.
Our standard version includes the OK1HRA Key #5 design along with the base needed to mount the paddle directly to the Rugged Box, making it an excellent addition to a compact QMX/QMX+ portable operating station.
What You Receive
This product includes:
OK1HRA Key #5 3D-printed paddle
3D-printed Rugged Box mounting base
Printed in durable black PETG
Other OK1HRA mounting configurations available by request
IMPORTANT – Printed Parts Only
This is NOT a complete CW paddle or complete builder kit.
CQ Homestead Supply supplies only the 3D-printed plastic components.
The builder must supply the additional hardware, electrical contacts, wiring, connector, and other components required to assemble the printed parts into a functional CW paddle.
No hardware, wiring, cable, plug, or electronic components are included unless specifically stated in the product listing.
BOM list and Instructions will be included.
Designed for the OK1HRA Rugged Box
Our standard configuration combines Key #5 with the Rugged Box mounting base, allowing the completed paddle to be mounted directly to the Rugged Box.
This creates a compact CW operating setup particularly well suited to the QRP Labs QCX, QMX+ and QMX without requiring the operator to carry a separate full-size paddle.
It's a great option for:
POTA
SOTA
Field Day
Portable QRP
Camping
Backpack radio
Field communications
Home-built and experimental radio stations
Printed in PETG
CQ Homestead Supply produces these components in black PETG for improved durability and temperature resistance compared with many basic PLA prints.
This makes the printed components well suited to portable radio equipment that may spend time in field boxes, vehicles, backpacks, and outdoor operating environments.
Other Mounting Options Available
The Rugged Box mounting base is our standard configuration, but it isn't your only option.
Other mounting configurations from Dan's original design can be printed by request.
Contact CQ Homestead Supply if you would like a different mounting arrangement.
A True Amateur Radio Builder Project
This product is intended for amateur radio operators who enjoy building and customizing their own equipment.
CQ Homestead Supply provides the professionally printed components, while you supply and assemble the remaining hardware and electrical components needed to complete your paddle.
The result is an exceptionally compact CW paddle that can become an integrated part of your portable QRP station.
Credit to the Original Designer
The Single CW Paddle and associated designs are the original work of Dan, OK1HRA.
CQ Homestead Supply produces and sells these printed components with permission from Dan, OK1HRA.
We are pleased to support Dan's work and make his designs more readily available to amateur radio operators who may not have access to their own 3D printer.
Please Note
This product is sold as a 3D-printed builder component set only.
Assembly is required.
Hardware, electrical contacts, wiring, cable, plug, and other components required to produce a functional CW paddle are not included.
Original Design: Dan, OK1HRA
Printed and offered by CQ Homestead Supply with the designer's permission.
CQ Homestead Supply — Equipment for operators who actually get out and use their gear.
Upgrade your QRP Labs QMX+ with an integrated internal battery system and amplified speaker audio!
The QMX+ Internal Battery & Audio Board Builder Kit is based on the open-source QMX+ Battery & Audio Board project designed by TA7MNA (Mustafa Necati Annakkaya). The board mounts directly above the QMX+ main PCB and provides a compact way to add internal battery power, charging circuitry, battery management, and amplified speaker audio inside your QMX+.
CQ Homestead Supply packages the project as a convenient builder kit, eliminating the need to individually source the various supporting boards and installation components.
This is a builder kit and requires assembly, soldering, modification of your QMX+, and final testing by the end user.
Choose the Correct Version
Two separate versions are available:
12V QMX+ Builder Kit Version 2
For QMX+ radios originally constructed for 12V operation.
9V QMX+ Builder Kit Version 2
For QMX+ radios originally constructed for 9V operation.
IMPORTANT: You must purchase the version that matches the voltage configuration of your QMX+. The 12V battery board must NOT be installed in a QMX+ configured for 9V operation. Applying the 12V battery system to a 9V-configured QMX+ can damage the radio.
What This Modification Adds
Once assembled and properly installed, the Battery & Audio Board provides:
Internal rechargeable battery capability
Integrated battery management
USB Type-C battery charging
Internal amplified audio
Internal speaker capability
Direct mounting to the QMX+ main PCB
A compact installation designed specifically around the QMX+ platform
The result is a much more self-contained QMX+ that is especially convenient for portable operation, POTA, field use, emergency communications, and grab-and-go QRP operation.
CQ Homestead Supply Builder Kit Include the following:
Our 0% kit is intended for builders who want to complete this modification themselves without having to track down the various small boards and installation components individually.
The kit includes the Battery & Audio main PCB along with the additional supporting boards/modules and installation hardware/components supplied by CQ Homestead Supply for completion of the modification.
Our 95% kit has the add on board completely assembled. End user completes the soldering and instalation into the QMX+ Radio.
All kits include a small speaker, that is installed by the end user.
To aid in locating the USB C port that needs to be cut in the rear pannel, CQHS provide a self alinging plastic template that locates the opening for easy drilling and filing by the end user. A 3mm or 1/8” drill is needed and not supplied. To finish the opening, small files are needed such as the Harbor Freight 4614 file set. Youtube How To Video: https://youtu.be/pv2CbtIN7ZQ
18650 lithium-ion batteries are NOT included.
Builder Skill Level
Intermediate
This is not a plug-and-play accessory.
Installation requires the builder to work inside the QMX+, assemble the Battery & Audio Board, solder components and modules, install headers and connections, and perform final inspection and testing.
Builders should be comfortable with:
Through-hole soldering
Basic electronic assembly
Working with PCB headers and small modules
Reading assembly instructions and PCB markings
Checking polarity and connections with a multimeter
Working safely with lithium-ion batteries
Modifying and working inside an assembled QMX+
Minor metal working skills
Careful assembly and inspection are particularly important because incorrect battery polarity, incorrect wiring, or selecting the wrong voltage version can damage the QMX+.
Battery Information
The internal battery system uses three 18650 lithium-ion non-protected cells.
Batteries are not included with this kit.
The builder is responsible for obtaining appropriate matching 18650 cells and installing them with the correct polarity. Only quality cells from a reputable supplier should be used.
Charging & Operation
The modification provides a dedicated USB Type-C connection for charging the internal battery pack.
The QMX+'s existing USB Type-C connector remains the radio's data connection and is not used to charge the internal battery pack.
Follow the project documentation carefully regarding charging, external DC power, battery installation, and power-down procedures. Always power off the QMX+ before connecting or disconnecting the DC power supply. Inserting or removing the DC jack while the battery board is installed can trigger a voltage transient as power switches over, which risks damaging the mainboard's voltage regulators.
Important Builder Notice
This product is supplied specifically as an amateur-radio builder kit.
CQ Homestead Supply does not install this modification into your radio as part of this product listing. Final assembly, installation, inspection, testing, and safe operation are the responsibility of the builder.
Always completely power down the QMX+ before connecting or disconnecting external DC power as directed by the project documentation.
Before applying power, double-check:
QMX+ voltage configuration
Battery polarity
BMS connections
Charger connections
PCB orientation
Header alignment
Solder joints
Speaker/audio connections
Never install the 12V version into a QMX+ configured for 9V operation.
Open-Source Design Credit
The QMX+ Battery & Audio Board was designed by and with permission of TA7MNA / Mustafa Necati Annakkaya and released as an open-source project for the amateur-radio community.
CQ Homestead Supply is providing a convenient builder-kit package based on this project. The original designer's identification and board markings are retained—we do not rebrand the project as our own design.
Project documentation, design information, assembly information, and updates are available from the original QMX+ Battery & Audio Board GitHub repository.
Please review the original project documentation before beginning assembly.
Please Note
QMX+ transceiver and 18650 batteries shown or referenced are not included.
This listing is for the Battery & Audio Board Builder Kit only.
Please verify whether your QMX+ is configured for 9V or 12V operation before ordering.
Basic Instructions from Necati, TA7MNA Github page:
Audio Calibration
Set radio volume to minimum.
Adjust the LM386 board's variable resistor until audio is barely audible.
Use radio's volume knob for future control.
Drilling a Hole in the Backplate
This step can be a bit tricky. First, you need to mount the board on top of the mainboard and secure it using 11 mm nylon hex spacers. Then, mark the backplate accordingly for drilling. Screwing the board in place ensures proper alignment and helps prevent mistakes.
On the first radio where I installed my board, I made the mistake of not aligning it properly — the charging port ended up slightly higher than the hole. Fortunately, it still works.
Adding a Speaker
For the speaker, you can use either a 0.5W or 1W 8-ohm speaker. Small laptop speakers matching those values should work as well. Attached the speaker on top of the BMS using double-sided foam tape. When the enclosure is screwed down, the top cover presses against the speaker, holding it securely in place.
Notes on RFI
Since there is an RFI source inside the enclosure, some noise may occur in the 9V models. However, the 12V versions are free from battery board-induced noise, except during charging. Please keep this in mind when using it with 9V models.
In our tests with the 9V regulator, we observed that it caused QRM at certain frequencies. However, this noise was often at a lower level than QMX’s own birdies and was not disturbing. When we connected an antenna to the QMX and listened, the noise remained below the noise level coming from the antenna.
Built-to-Order Pre-Sale – Full Payment Required
This product is built to order and is not stocked inventory.
When you place your order, you are reserving a production slot for a custom-built unit. Full payment is required at the time of purchase. Your order will be added to the production queue and individually assembled, programmed and prepared for shipment.
Current build time is approximately 2–4 weeks from the date of purchase.
Once your unit is completed, it will be carefully packaged and shipped to the address provided during checkout.
Product Description
The AC8L ABS V2 Internal ATU / Battery / Speaker System is an all-in-one internal expansion package for the QRP Labs QMX+ that adds automatic antenna tuning, internal battery capability, and integrated speaker functionality in a compact portable format.
Originally designed by Sardar AC8L, the ABS V2 project combines multiple field-operating accessories into a single integrated solution for portable QRP operators.
Additional technical documentation, firmware information, and open-source project files are available through the AC8L GitHub repository. Ongoing development discussions and community support can be found through the QRP Labs Groups.io community.
General Product Overview
The 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 activations, field deployment, and emergency communications, the ABS V2 provides a clean internal solution without requiring multiple external accessories.
Note: To comply with shipping regulations and reduce shipping costs, 18650 batteries are not included. Batteries must be supplied by the customer.
95% Build Package – Fully Assembled & Programmed
Price: $235.00
This premium version is professionally assembled, programmed and nearly ready for installation.
All SMD and through-hole components are installed, and the PIC controller is pre-programmed with current firmware.
Included:
• Fully assembled PCB set
• PIC controller pre-programmed and tested
• ATU board assembled
• Speaker board assembled
• Battery management board assembled
Final Installation Required:
You will need to solder four header connections to your QMX+ radio and perform the final adjustments.
This package is ideal for operators who want a near turn-key solution while minimizing the amount of assembly work required.
Important Pre-Sale Information
• This is a built-to-order product.
• Full payment is required at the time of ordering.
• Orders cannot begin production until payment has been received.
• Estimated build time is 2–4 weeks before shipment.
• Production times may vary slightly based on component availability and order volume.
• Your order reserves a place in the current production queue.
Important Technical Notes
The ABS V2 project remains under active community development.
This tuner is based on the ATU-100 architecture and shares many of the operational characteristics and limitations associated with that design.
Due to tuning performance limitations at the upper end of the HF spectrum and on VHF frequencies, it is recommended that the ATU be bypassed when operating on the 10 Meter and 6 Meter bands.
Performance characteristics and firmware improvements continue to evolve through ongoing community testing and experimentation.
18650 Cells use a nonprotected button top cell ~ users can modify for protected cells by replacing the cell holders.
Builders and operators are encouraged to review available documentation and community discussions prior to installation and operation.
The ABS V2 is designed to utilize an external SMA RF jumper between the QMX+ and the ATU assembly.
Advanced users may choose to internally reroute the RF signal path and eliminate the external jumper; however, components required for those modifications are not included.
As with many open-source amateur radio projects, some experimentation may be required depending on antenna type, operating band, station configuration, and operating environment.
Complete surface-mount component kit for the ABS V2 ATU board.
Includes:
PIC16F1938 microcontroller
0805 SMD capacitors
0805 SMD resistors
0805 green LED
1812 resistors
2917 tantalum capacitors
SOD123 diodes
SOT23 MOSFETs
TC33X trimmer potentiometer
G6K-2F-Y DC4.5 relays
Ideal for advanced builders assembling the ATU board from a blank PCB.
Note: ATU PCB not included
Complete through-hole component kit for builders who already have populated SMD ATU boards.
Includes:
8-pin DIP socket Qty: 1
LM386-4 IC Qty: 1
Power switch Qty: 1
Toroidal cores Qty: 7
Bi-filar transformer core Qty: 1
24 AWG magnet wire – 8 ft Qty: 1
SMA jacks Qty: 2
11mm standoff and nuts Qty: 3
JST female connector Qty: 1
Header pin sets and matching female headers
6x6x8 tactile switch Qty: 1
6mm button cover Qty: 1
2mm blue LED Qty: 1
JST wire jumper Qty: 1
2P Dupont wire jumper Qty: 1
Designed for completing the manual assembly portion of the ATU board.
Note: ATU PCB not included
Battery Board Parts Kit — $27.50
Complete hardware kit for assembling the battery and speaker board section of the ABS V2 system.
Includes:
· Battery cell holders Qty: 3
· 3S 40A BMS board Qty: 1
· 8Ω speaker Qty: 1
· Voltmeter and mounting bracket Qty: 1
· Power switch Qty: 1
· Power meter switch and button Qty: 1
· 2x2P header pin Qty: 1
· 1x2P header pin Qty: 1
· 11mm standoff and screw set Qty: 3
Perfect for completing or repairing the power and speaker section of the ABS V2 assembly.howcase what this product is about. What’s it made of? How was it made? What are ways to enjoy it?
Note: Does not include the Battery PCB.
Upgrade your AC8L ATU with a bright, easy-to-read OLED display designed specifically for field and portable operation. This DIY upgrade adds a compact 0.91" white OLED screen that provides clear tuning and operating information while maintaining a clean, professional appearance on your ATU enclosure.
The custom display mounting bracket serves a dual purpose—it securely mounts the OLED display and acts as a drilling template for accurately laying out the display opening on your aluminum enclosure. Simply position the template, mark your cutout, and hand-fit the display opening using common workshop tools.
Kit Includes
0.91" White OLED Display
Custom OLED Mounting/Drill Template Bracket
Pre-wired Jumper Harness
Pin Header
(2) Mounting Screws
OLED Firmware HEX File for User Installation
Installation Requirements
This kit is intended for builders who are comfortable with electronics assembly and modification. Installation requires:
Basic soldering skills
Ability to program a PIC microcontroller using a PICkit programmer
Basic metalworking tools for cutting and filing the display opening
Ability to upload the supplied firmware HEX file to the ATU controller
Important Notes
PICkit programmer is not included.
The installer is responsible for backing up any existing firmware prior to reflashing.
Some enclosure modification is required.
This is a DIY builder's kit and is recommended for users familiar with electronic assembly and firmware programming.
Perfect for builders who want to add a professional OLED display to their AC8L ATU while retaining the satisfaction of completing the installation themselves. The included mounting template simplifies the enclosure modification process and helps ensure accurate display placement for a clean finished appearance.
Keep your AC8L ATU build moving forward with a complete matched set of high-quality Omron G6K-2F-Y signal relays.
These relays are the heart of the AC8L Automatic Antenna Tuner, providing the switching network required to configure the tuner for optimum impedance matching across the amateur radio HF bands. Whether you're building a new tuner, repairing an existing unit, or stocking spares for future projects, this relay package provides the exact quantity required for a complete AC8L ATU build.
Each relay is factory new and supplied in original carrier tape packaging to protect the contacts during shipping and handling.
Features
Genuine Omron G6K-2F-Y signal relays
Complete set of 15 relays
Suitable for AC8L ATU builds and repairs
Low-profile surface-mount design
Ideal for QRP and portable amateur radio applications
Supplied in protective carrier tape packaging
Applications
AC8L Automatic Antenna Tuner
Replacement relay kits
Spare parts inventory
Amateur radio tuner projects
QRP equipment construction and maintenance
Package Includes
Fifteen (15) Omron G6K-2F-Y relays
Builder's Note: The AC8L ATU requires fifteen G6K-2F-Y relays. This package contains the complete relay set needed for one tuner build.
Built for operators who actually spend time in the field.
The CQ Homestead Supply Premium QMX+ Microphone was designed from the ground up to improve comfort, usability, and audio performance for portable QRP operators using the QRP Labs QMX+ radio platform.
Unlike many compact aftermarket microphones that can feel cramped during long operating sessions, this design features a larger ergonomic housing that is easier to grip and operate during POTA, SOTA, field day, and portable operations. Whether you are wearing gloves, operating in cold weather, or simply spending hours activating a park, the improved form factor provides a more comfortable and natural feel in the hand.
At the center of the design is the recommended PUI Audio AOM-5024L-HD-R analog electret microphone element, delivering clear and consistent transmit audio performance with a -24 dB sensitivity rating optimized for QRP voice communications.
Features
Premium PUI Audio AOM-5024L-HD-R microphone element
-24 dB sensitivity for clean voice audio
Oversized PTT button for easier operation in the field
Enlarged ergonomic housing for improved comfort and grip
Lightweight and compact portable-friendly design
Designed specifically for QMX+ and QMX radios
Ideal for POTA, SOTA, field operations, and portable HF use
Comes complete with an ultra flexable 3.3 feet / 1 meter 3.5mm audio cable
Unit is not glued, is fasten together with a screw for easy maintenance
If you would like a custom color to match that new Rugged Case, email us for a quote.
Designed by Operators, for Operators
Every microphone is assembled by CQ Homestead Supply with a focus on rugged field usability and long operating comfort. This is not just another small handheld mic — it is a purpose-built upgrade for serious portable QRP operators.
Let’s Keep America Working. Proudly built in New Jersey by dedicated hams and outdoor enthusiasts.
Upgrade your QRP Labs QMX+ with a professionally integrated OLED display system designed specifically for the AC8L ATU platform. These custom display kits provide enhanced tuner visibility, improved field operation, and a clean factory-style installation directly into the QMX+ aluminum housing.
Each OLED upgrade package includes:
Precision milled QMX+ aluminum top cover
Pre-installed OLED display assembly
Connection wiring harness
Installation instructions
Custom AC8L ATU OLED firmware
Ready for field or portable operation
These upgrades are designed to provide a clean and rugged installation while maintaining the compact form factor of the QMX+.
Available OLED Options
0.91" OLED Display Upgrade
A compact and lightweight OLED display option that provides clear tuner information while maintaining a minimal footprint on the radio enclosure.
Features:
Compact low-profile display
Excellent readability in portable operating conditions
Clean integrated appearance
Ideal for users wanting a simple extra small display solution
0.96" OLED Display Upgrade
A larger OLED display option for improved visibility and easier viewing during portable, mobile, or low-light operation.
Features:
Larger display area for improved readability
Enhanced viewing angle
Integrated milled aluminum top cover
Clean professional installation
0.96" OLED Display with 3-Button Control
The most advanced OLED option available for the AC8L ATU system. This version includes integrated 3-button control capability, allowing expanded tuner operation and menu navigation directly from the front panel. Eliminates the one button and single oled control on the front pannel. Allows user to retain the orignal QMX+ milled aluminum front pannel.
Features:
Large 0.96" OLED display
Integrated 3-button control interface
Improved user control and tuner accessibility
Designed for advanced field operation and tuning functions
Firmware Information
Each OLED kit includes information on the required custom firmware changes necessary for OLED functionality with the AC8L ATU system.
If purchased together with an AC8L ATU kit, the PIC controller can be pre-flashed with the custom firmware before shipment.
Users installing the OLED upgrade onto an existing ATU will need a PICkit 3, PICkit 4, or PICkit 5 programmer to flash the included firmware onto the PIC controller or modify the HEX values.
Installation Notes
These OLED upgrades are intended for users familiar with basic electronic assembly, soldering procedures and PIC programing expirance. Moderate assembly experience is recommended.
The precision milled top cover provides a clean and professional appearance while maintaining durability for portable and field radio use.
Designed specifically for:
QRP Labs QMX+
AC8L ATU
Important Notice: OLED Power Readings & Low-Power Tuning
CQ Homestead Supply incorporates modifications to the AC8L ATU's RF sensing circuit to improve tuning performance at low power levels, particularly when using the QRP Labs QMX and QMX+ radios. These changes have not been included in the Github documents, but are from the developers of the ATU design.
The original 10:1 RF sensing transformer has been changed to 5:1, and the resistor-divider circuit has been modified to increase sensitivity. These changes improve tuning reliability when operating at reduced power, including during the QMX/QMX+ Tune SWR function.
OLED Power Reading:
Because of these modifications, the optional OLED can display approximately 16 times the actual RF output power when EEPROM Cell 31 is set to 10. For example, an actual output of 1 watt may display as 16 watts, while 6 watts may display as 96 watts. Users should devide all readings by 16 to get an approximate reading if cell 31 is set to 10. Changing Cell 31 to 05 adjusts the firmware's RF transformer setting and reduces the OLED's displayed power reading. All CQHS kits are programed with cell 31 set to 5 to give the user the closest posable reading.
Important: The setting of Cell 31 to 05 may prevent the tuner from initiating a tune below approximately 1 watt on standard configured QMX+ radios. Operators using higher-power QMX/QMX+ configurations may find this acceptable.
These incorrect readings are normal and do not indicate a problem with the tuner. SWR and tuning information remain useful, but the displayed power should not be considered an accurate wattmeter reading. It should only be used for general reference only and verified by a dedicated watt meter for precise measurements.
These modifications prioritize low-power tuning over displayed power accuracy.
We recommend using the QMX+ reduced-power Tune SWR function when performing antenna tuning if you are using the BS170 power mod.
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.
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