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Learn how to build a QRP digital transceiver with Arduino, based on a project by Burkhard Kainka. This article covers the development process, including the source code, modifications made, and the addition of an OLED display for a more professional look. Discover the inner workings of the transceiver, from the receiver to the oscillator, and how components like the CD2003 are utilized. Explore the schematic design, the use of a PLL module Si5351A controlled by Arduino nano, and more. Ideal for hams looking to create their own digital transceiver for amateur radio operations.

The XV4-10 is a linear transverter for the 4m band to be used with a 10m transceiver. Input frequency 29-30 MHz, output frequency 69.5-70.5 MHz

Voldatech, a manufacturer based in China, produces a range of RF feeder cables and site components essential for amateur radio installations and telecommunication infrastructure. Their product line includes various types of coaxial cables, such as **50 Ohm** and 75 Ohm options, along with a comprehensive selection of connectors like N-type, UHF, and BNC. These components are critical for maintaining signal integrity and minimizing loss in antenna systems, whether for a home shack or a remote DXpedition setup. The company's focus on _RF Coax cables_ and connectors directly supports the needs of radio amateurs seeking reliable transmission lines for their transceivers and antennas. Amateurs often compare Voldatech's offerings to established brands, evaluating factors such as impedance matching, shielding effectiveness, and durability under various environmental conditions. The availability of diverse cable types allows operators to select optimal solutions for different frequency bands and power levels, from QRP to high-power amplifier setups. Their products are particularly relevant for those constructing new antenna arrays or upgrading existing feedline systems, aiming to achieve maximum power transfer and reduce standing wave ratio (SWR) for efficient signal propagation.

18MHz QRP SSB transceiver PEREGRINO DX is a small portable QRPp project

The ARRL's End-Fed Half-Wave (EFHW) Antenna Kit is an easy-to-build four-band antenna designed for 10, 15, 20, and 40 meters. Ideal for portable operations, it includes a 49:1 impedance transformer for compatibility with most transceivers. This project, detailed with step-by-step assembly instructions, involves creating a weatherproof enclosure and impedance matching network. The kit simplifies HF operations and supports multiple configurations, making it a versatile tool for amateur radio opertors.

A review of the Yaesu FT-8900r 29/50/144/430 MHz FM Transceiver, providing 50 Watts of power output on the 29/50/144 MHz Amateur bands, and 35 Watts on the 430 MHz band.

Successor to the Metamorserino, this is a multi-functional Morse code machine (Keyer, Generator, Trainer) that includes also a transceiver using LoRa on the 70cm band.

DK7IH QRP transceiver for 14 MHz. This small and compact home made transceiver with a max power output of 5W, the VFO module is based on the clock oscillator chip Si5351A by Silicon Labs ATmega168 and OLED 1306

Mini-Operating Guide includes useful hints on Using the HM-133 Microphone, Basic Operation, Operating through a Repeater, Programming a Memory Channel and Assigning a Memory Channel to a Memory Bank

AC7GZ/B is a converted Sharp CB-2460 Citizens Band transceiver operatin on 28.2118 MHz.

Although most Preselectors are designed with an internal T/R relay, theoretically enabling direct insertion between the transceiver and the antenna, there is a problem when running CW, especially when running full QSK. The switching time of the internal relay is too slow to follow full QSK. The best way to avoid this problem altogether is to insert the Preselector directly into the transceiver’s RX antenna line, thus avoiding entirely the need to switch the Preselector in and out.

Amateur radio repeaters, often designated by an "R" number like _R6_ or _R5_, serve as crucial infrastructure for extending VHF/UHF communications range. This resource from Essex Ham explains the fundamental concept of a repeater, detailing how it receives on one frequency and simultaneously retransmits on another, typically with a 600 kHz offset for 2-meter repeaters. Understanding the input and output frequencies, along with the required CTCSS tone, is essential for successful access, ensuring your signal is processed and relayed across a wider service area. The article clarifies the importance of using the correct _CTCSS_ (Continuous Tone-Coded Squelch System) tone, often referred to as a sub-audible tone, to activate a specific repeater. It also touches upon the concept of _simplex_ operation versus repeater use, highlighting the benefits of repeaters for mobile and handheld transceivers. Proper operating procedures, such as listening before transmitting and keeping transmissions concise, are emphasized to maintain good amateur practice on shared repeater assets.

When operating contest in a multi transceiver environment interferences between the 40m and 20m are guaranteed. An easy and inexpensive way to reduce interferences is to add coax stub filters

Presents various amateur radio topics through blog posts, detailing operational experiences and technical insights from the perspective of SV2YC. The content frequently discusses antenna projects, such as a **portable 20m/40m dipole** designed for rapid deployment, and explores the performance characteristics of different wire configurations in varied field conditions. Observations on propagation and band activity across the HF spectrum are also regularly documented, providing practical context for fellow operators. Specific entries often include detailed accounts of **DX contacts** and participation in minor contests, outlining station setup, power levels, and antenna choices. The blog also covers modifications to commercial transceivers and homebrew accessory construction, offering practical advice on improving station efficiency and functionality. Further posts delve into software applications for logging and digital modes, sharing configurations and operational tips for maximizing their utility in daily amateur radio activities.

Elecraft new QRP transceiver, an 80-10 m SSB/CW/Data station that fits in your pocket

A very small receiver converter that can be plugged to the backside of the battery powered portable transceiver FT817 from Yaesu. A high performance receiver for 2.3GHz amateur radio signal

This project enhances Arjan te Marvelde's uSDR-pico by integrating a waterfall display feature. By adding an ILI9341 240x320 2.4" TFT display and modifying the software, the goal is to provide a panadapter to the existing transceiver. Initially developed with Visual Studio, the code was later migrated to Arduino IDE for Raspberry Pi Pico compatibility. The focus remains on preserving the original software, primarily enhancing the dsp.c file for waterfall implementation.

A lean design SSB-Transceiver for 14 MHz, Simple SSB Transceiver for 14MHz VFO controlled, 5W PEP

Yaesu FT-450D HF / 6 Meter DSP Transceiver, a nice affordable transceiver for amateur radio use, but understand the caveats.

A web site deticated to the Kenwood TS-590 transceiver with links to software downloads fot the 590s seriend and technical documentation in Russian.

Schematic diagram circuit to build a RS232 serial interface for the Yaesu FT 1000D, works also as CW Keyer control with Log-EQF software. May be used with other Yaesu HF Transceivers.

Reviews of the Icom ID-51A handheld dual band transceiver

The Icom IC-7300 is a popular SDR transceiver known for its excellent performance in ham bands. However, users have reported issues with reception reliability outside these bands due to ADC aliasing. This phenomenon occurs when the sampling rate of the radio interacts with frequencies outside the intended range, leading to unwanted signals being received. For instance, when tuned between 30 to 36 MHz, users may inadvertently pick up WFM broadcast signals or PMR communications due to aliasing effects. This guide outlines modifications to improve the IC-7300's performance by addressing the low-pass filter design, which is crucial for reducing interference from these unwanted signals. The proposed modifications involve adjusting the low-pass filter on the PA unit to better attenuate frequencies that cause aliasing. Measurements indicate that the original filter design allows significant signal leakage, leading to false receptions. By implementing the suggested changes, users can achieve a notable reduction in unwanted signals, enhancing the overall functionality of the IC-7300. While the modification requires careful soldering, the benefits in performance make it a worthwhile endeavor for serious operators looking to optimize their SDR experience.

A pocket-sized homebrew 40m CW QRPp/QRP transceiver

Malcom Technical Support Radio Electronics Repair, ICOM Authorized Service Center, also service 1988 and newer Kenwood HF/VHF/UHF transceivers based in Toledo, WA USA

A review of the dual band FT-8800R transceiver by the jeep expedition group

SimpleHRR is a free ham radio remote control web application (or web app) hosted by Raspberry Pi in the ham station to remote control a ham radio HF transceiver through a supported web browser from a Desktop PC, Laptop or Android phone. Supports recent ICOM IC-7x series transceivers

For my SOTA activities, i recently bought a QRP transceiver QRP SW-3B, which is a three-band QRP CW only for 40/30/20 m. So, i needed an antenna that would allow to use these 3 bands in SOTA portable activity. Already having some experience with the EFHW antenna, i decided to build one for 40/30/20m.

Despite the model limitations, such as a single TXRX antenna connector, the author shares a reversible modification involving a coax relay for enhanced functionality, demonstrating the transceiver's adaptability and customization potential.

The DX FT8 is a compact, multiband tablet transceiver designed for FT8 digital mode enthusiasts. Supporting five or seven HF bands, it integrates an STM32F746-based touchscreen interface for standalone operation, eliminating the need for a PC. The latest firmware (v1.9.2) adds SOTA/POTA calling and free-text messaging. Its efficient power design, unique RF amplifier, and 3D-printed case enhance portability. Open-source firmware and community-driven development make it a versatile choice for portable FT8 operation, ideal for SOTA, POTA, and travel use. DX FT8 TRANSCEIVER PROJECT is a collaboration between Charles(Charley)Hill, W5BAA and Barbaros(Barb)Asuroglu, WB2CBA.

An article by MicroHam on using the Icom PW-1 RF Power Amplifier safely and with non-Icom transceivers.

The (tr)uSDX is a 5-Band / Mulitmode QRP Transceiver in Pocket Format (90x60x30mm - 140g). It features a highly efficient Class E PA and Supports CW/LSB/USB and AM/FM. Right now it covers 80/60/40/30/20m and in Future there will be support for 17/15/12/10m

Yaesu FT-7800R dual band mobile transceiver reviews

ICOM ID-880H Digital D-STAR 2M/440 Dual Band Mobile transceiver

QSK 2500 enhances HF amplifiers by enabling full break-in (_QSK_) operation, allowing for seamless communication during CW transmissions. This device supports **all** HF transceivers that are QSK-compatible, ensuring versatility across various setups. The QSK 2500 facilitates quick switching between transmit and receive modes, which is crucial for effective DXing and contesting. With its straightforward installation, operators can achieve **improved** responsiveness in their communications without the need for extensive modifications to their existing amplifiers. This project is particularly beneficial for those engaged in high-speed CW operations, where timing is critical.

Picture and technical specifications of the Yaesu FT-8800R dual band transceiver

A home made portable QRP transceiver designed to work on 40 or 80 meters SSB band.

UHSDR stands for UniversalHamSoftwareDefinedRadio. The project provides the firmware to run standalone HAM transceivers. It currently supports STM32F4 and STM32F7 MCU based QSD designs.

An optocoupled audio interface between PC and Transceiver for digital modes. The article includes full schematic of complete board and build instructions.

Manufacturer of two way radios based in Shenzhen China. Retevis produce commercial, personal and amateur radio handheld and mobile transceivers, either for analog and digital modes. Retevis produce also two-way radio accessories and repeaters.

A new SDR radio concept developed by N6QW as an experimental 5W SDR transceiver for the 40 meter bands. Radio and Rig (RADIG) is a term conied by the author.

A review with early observations and technical data specifications of the Icom IC-703 QRP HF+50 MHz transceiver

20W portable handheld SSB transceiver for 20 meters band

Yaesu FT-710 AESS MF/HF and 6-Meter Transceiver review on QST

The MiniPA Linear Amplifier for HF page discusses the popularity of QRP for HF among ham radio operators, such as those using the Yaesu FT818 or low power SDR transceivers. It explores the use of cheap kits from eBay or Chinese suppliers to build a 70-100W SSB amplifier using IRF530 MOSFET transistors. The article provides a review of the MiniPA design, including its features, components, and assembly process. It also highlights the importance of using a heatsink and forced air cooling for optimal performance. This page is useful for hams looking to enhance their HF rig with a budget-friendly amplifier.

From buying an amateur radio transceiver, choosing the correct power supply, selecting the antenna and its feed line, to choosing the best microphone and accessories. A nice presentation for beginners.

A complete set of pages about the Yaesu FTDX3000 Yaesu transceiver, including USB Driver informations, voice keyer details, complete menu group informations, remote control and CAT control program, SDR Play and FTDX3000 configuration, firmware links and manuals

The ICOM IC-7610 SDR HF/50MHz Transceiver official product page with product specifications, option accessories and video at ICOM UK

The QMX+ Transceiver Kit from QRP Labs is a high-performance, feature-packed 160-6m 5W transceiver designed for hams. This multi-mode kit includes embedded SDR, USB sound card, CAT control, synthesized VFO, RTC, and optional internal GPS. It can be used in CW, digital, and SSB modes, with standalone CW operation, digi mode via USB to PC, or SSB operation. The kit offers standalone beacon functionality and shares firmware with the QMX model. With an optional enclosure, battery-backed RTC, and GPS, the QMX+ is versatile and easy to build, making it ideal for ham radio operators looking for a customizable transceiver kit.

Building an End-Fed Half-Wave (EFHW) antenna from a kit, as detailed by Frank Bontenbal, PA2DKW, with process photos by Bob Inderbitzen, NQ1R, offers a practical approach for hams. This specific kit, a collaboration between ARRL and HF Kits, targets 10, 15, 20, and 40 meters, making it a versatile option for HF operations. Unlike a center-fed dipole, the EFHW is a half-wavelength antenna fed at one end, which simplifies deployment, particularly for portable use. The construction guide meticulously outlines the assembly of the 49:1 impedance matching network, crucial for transforming the antenna's high impedance (around 2,500 Ohms) to a transceiver-friendly 50 Ohms. Steps include preparing the enclosure by drilling holes for the coaxial connector and antenna connections, followed by the precise winding of enameled copper wire onto a toroid to create the transformer. The guide emphasizes careful insulation removal and soldering for reliable connections. Final assembly involves integrating a 100 pF capacitor for higher band compensation, soldering the transformer's primary and secondary sides, and conducting SWR tests with a 2K7 resistor or a half-wavelength wire. The document also provides examples of wire lengths for different bands, such as 16 feet for 10 meters or 66 feet for 40 meters, demonstrating the transformer's adaptability for various half-wavelength configurations.