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TwoWayBattery.com is your source for high quality two way radio replacement batteries, chargers, eliminators and accessories. Batteries for major brands Alinco Icom Kenwood Motorola Uniden Yaesu Standard and more

Mobile RFI, often manifesting as persistent noise in the receiver even with the antenna disconnected, frequently originates from the vehicle's power supply system. This guide details systematic troubleshooting steps, beginning with isolating the radio from the car's 12-volt supply to confirm the power system as the noise source. It emphasizes the critical importance of drawing power directly from the battery using **heavy gauge wire**, bypassing the fuse block to leverage the battery's natural capacitance for RFI suppression and ensuring a solid RF ground. Proper routing of power lines through the firewall is also covered, advocating for dedicated grommeted holes to prevent inductive coupling from other wiring harnesses. The article stresses the necessity of fusing both positive and negative leads from the battery, a crucial safety measure to prevent damage to the rig and mitigate high-current risks should the battery's engine block ground become compromised during service. Addressing **alternator whine**, a common high-pitched noise that varies with engine speed, the resource suggests checking battery connections and the alternator-to-battery harness for looseness or corrosion. It also mentions the utility of adding an external RF noise suppression capacitor in parallel with the alternator's internal capacitor for enhanced filtering, and the effectiveness of commercially available in-line power supply filters.

Battery-powered monitor designed to provide an audible indication of keying for those whose rigs lack a CW sidetone

Portable Zero LLC manufactures amateur radio accessories, including tactical carrying systems and battery pack systems. The company produces the _Escort_ series Tactical Carrying System for _Yaesu_ FT-857D/891, FT-991, FT-817/818ND, and _Icom_ IC-706/703/7000, IC-7300 transceivers, available in Black Texture and OD Green. Additional products include the _Sherpa Pack_ for the _Yaesu_ FT-817 and the Field Power 12 and Field Power 3 Battery Cases. Portable Zero LLC, established no later than **2013**, manufactures its products in the USA, utilizing CAD design and CNC precision laser cutting. DXZone Focus: Portable Zero LLC | Tactical Carrying Systems | Battery Pack Systems | Yaesu | Icom

Thanks to the popularity of cell phones, laptops and other personal electronic devices, the battery industry has been market-driven to produce higher capacity batteries in lighter weights than previously possible with yesterday's chemistries.As a result, a wide variety of battery types are available to the outdoor QRP operator.

The _Fuji-OSCAR 20_ (FO-20) amateur radio satellite, launched over six years prior, continues to operate reliably, despite a gradual decrease in its Nickel-Cadmium storage battery capacity and solar cell degradation. The satellite's power system can still supply approximately **10 W**, enabling operations. During the non-eclipse period, typically from mid-June through March, the satellite experiences a 0% eclipse rate, ensuring sufficient power generation. This allows for the potential operation of the onboard BBS, which had been previously suspended due to concerns about power shortages. An "eclipse rate" refers to the proportion of time a satellite spends in the Earth's shadow during each orbit. When the satellite's orbital plane is perpendicular to the sun's direction, the eclipse ratio becomes zero, meaning continuous solar illumination. Understanding these eclipse periods is crucial for managing satellite power budgets and scheduling operations, particularly for power-intensive functions like the BBS, which can now be considered for activation during periods of sustained solar exposure.

A NiCAD Battery Charger with Current and Voltage Limiting

House of Batteries is a master distributor and custom battery pack assembler for every major battery manufacturer in every battery chemistry for every electronic application

Make your own battery clip by nj2x

What sort of batteries when operating mobile, choosing proper battery technology

Provides custom battery pack assembly services, focusing on portable power solutions for two-way radio applications. The company distributes batteries from numerous manufacturers, ensuring a broad selection for various radio models. This includes replacement packs for popular brands such as _Kenwood_, _Icom_, and Yaesu handheld transceivers, as well as batteries for CB radios and scanners. The core business function involves designing and building specific battery configurations to meet unique customer requirements, extending the operational life of portable radio equipment. Their offerings support a wide range of amateur radio activities requiring reliable, field-deployable power sources. Advanced Battery Systems also supplies individual cells and components, enabling radio operators to repair or rebuild existing battery packs, potentially saving costs compared to purchasing new OEM units. They emphasize durability and performance in their custom builds, aiming for **extended cycle life** and **consistent power output**.

Antenna and Power considerations, ALC Keying interface, Battery info, Keying interfaces and more

GoGreenSolar provides comprehensive solutions for **DIY solar panel systems**, catering to both homeowners and professionals seeking energy independence or reduced utility costs. Their offerings include a variety of solar kits such as Grid-Tie, Off-Grid, and Battery Backup configurations, designed to integrate seamlessly with existing utility infrastructure or provide complete autonomy in remote locations. Customers can select from Microinverter or String Inverter kits, along with essential components like **solar panels**, inverters, batteries, and racking systems, all curated from reputable brands known for efficiency and durability. The company emphasizes end-to-end support, from initial consultation and custom system design to providing easy-to-follow installation manuals. They offer financing options, including quick-approval loans with zero down payment, and a money-back guarantee if a solar permit is not approved. The platform also features a solar calculator and a questionnaire to help users determine the most suitable system for their specific energy requirements and property characteristics. GoGreenSolar aims to simplify the solar adoption process, enabling significant savings on energy bills and labor costs. Their approach focuses on empowering users to install their own systems with expert guidance, ensuring optimal performance and a secure energy future for homes and businesses.

PCB for a battery charger described in the datasheet for the MAX712/MAX713 fast charge controllers.

Haredata Electronics is your one stop shop for Power Supplies, Chargers, Battery Packs & Accessories. Power Supplies Chargers, Battery Packs , Power Supply Accessories , Haredata Electronics Limited,

Constructing a basic multimeter involves integrating a 0-1mA meter movement with various shunts and multipliers, selected via a switch, to create a versatile instrument capable of measuring DC volts, current, and resistance. The design outlines two main units: a primary unit handling six DC current ranges up to 1 amp and eight DC voltage ranges up to 1000 volts, alongside an internal battery for an ohms range up to 200,000 ohms. This approach allows for a practical, hands-on understanding of meter operation. An add-on unit further extends the multimeter's capabilities, incorporating a meter rectifier and switched series resistors to provide four AC voltage ranges up to 100 volts. Additional shunt and series resistors, designated Ra and Rb, are included to expand the instrument's range to 10A and 5kV, demonstrating how modular design can enhance functionality. When this add-on is in use, the main instrument is set to measure 1mA FSD, connecting via specific lugs. Component selection emphasizes precision, with 1% tolerance high stability resistors for series elements and Eureka resistance wire for shunts. The design specifies values calculated for a meter with 60 ohms internal resistance, noting that these would require modification for different meter characteristics. Experimental adjustment of shunt values is recommended to ensure accurate readings against a calibrated reference meter, reinforcing practical calibration techniques.

Solar panels test for portable battery charger by YO4HHP

This battery charger circuit is regulated and adjustable to make this circuit able to charge the mosto NiCAD battery.

A high speed, self discovering, self configuring, fault tolerant, wireless computer network that can run for days from a fully charged car battery with focus on emergency communications

The charger described here is intended for charging small 12 Volt lead acid batteries

Primary, Ion, and Polymer, a lithium battery primer, learn the differences between and varied uses for these diverse types of lithium batteries.

an autonomous device that will periodically discharge A recharge Nickel Cadmium (Ni-Cd) or Nickel-Metal-Hydride (Ni-MH) battery packs so that they are always fresh and ready to deliver by VE2ZAZ

The current page presents a domain name for sale, rather than providing amateur radio content. It outlines the process for acquiring the _ae5x.com_ domain, including a direct purchase price of **$3,795** or a 24-month payment plan at $158.13 per month with 0% interest. The service emphasizes quick delivery, secure shopping via SSL encryption, and a 30-day money-back guarantee. Information regarding domain transfers to other registrars like GoDaddy is provided, noting that transfers can take up to 5 days and payment plan domains are ineligible until fully paid. The purchase includes only the domain name, with hosting and web design services needing to be sourced separately. Privacy protection options through NameBright.com are also mentioned.

The W6JWS 2-meter Repeater Maintenance and Repair Log documents the ongoing upkeep of a 146.745 MHz repeater, specifically addressing modifications to enhance its functionality. It details changes made to ensure the repeater powers up in _PL mode_ and to improve the reliability of touch-tone control, drawing comparisons to similar work performed on the AE6KE repeater. The log also notes a repair to a fused wire in the reverse battery protection circuit after an accidental polarity reversal, highlighting a temporary workaround where a wire was omitted but the system remained operational. The resource includes practical insights from Jeff Liebermann, AE6KS, regarding jumper configurations and programming, with accompanying photos. It provides access to several documents for the Icom RP-1510 repeater, including operating manuals and a schematic for the single logic board version, which differs from the dual-board configuration described in some printed manuals. The log mentions a specific modification to adjust the dropout delay, which was later deemed unnecessary, and references a related project for the AE6KE repeater, aiming to replicate successful modifications on the W6JWS machine, resulting in improved touch-tone reliability and proper PL mode activation.

Solar power supplies combine a photovoltaic (PV) solar panel with a Lithium Iron Phosphate (LiFePO4) battery to provide reliable, off-grid power for amateur radio stations, camping, remote equipment, emergency preparedness, and anything else that needs power.

The Baofeng UV-5R handheld transceiver, introduced around 2012, operates across the 2-meter (144-148 MHz) and 70-centimeter (420-450 MHz) amateur bands, offering dual-band receive and transmit capabilities. This review provides an early assessment of the radio's form factor, user interface, and general performance, noting its compact size and the inclusion of a **VFO/Memory mode** button for frequency management. The device supports both FM and narrow FM modes, with a reported power output of 4 watts on VHF and 3 watts on UHF, making it suitable for local simplex and repeater operations. Key features discussed include its 128-channel memory capacity, a built-in VOX function, and a **DTMF keypad** for tone dialing and repeater access. The review highlights the radio's ability to scan frequencies and memories, along with a dual-watch function allowing simultaneous monitoring of two frequencies. Battery life is addressed, with the standard 1800 mAh Li-ion pack providing several hours of operation depending on transmit usage. Initial impressions cover the radio's construction and the clarity of its LCD display, which shows both A and B band frequencies.

An interesting article about a homemade LiFePO4 battery pack for ham radio operations, a 10Ah LiFePO4 based on Headway 38120 Cells

Battery consumer information and answers to frequently asked questions (faq) about car and deep cycle batteries.

This article documents the author's latest go-box build for outdoor ham radio operations using a Yaesu FT-891 transceiver. The go-box is constructed from a plastic "50-cal ammo case" and contains various components, including the transceiver, LDG Z11 Pro autotuner, DIY Yaesu FH-2 remote control keypad, and an external battery. The author details the design considerations, the mounting of components inside the box, and addresses issues related to ventilation and cable management. The go-box is geared for CW operations and POTA activations, with further modifications planned for a microphone and DATA jack. This project allows for rugged, environmentally protected outdoor radio operations while maintaining portability.

Bird 4314 RF Power Meter Battery Replacement

The Vibroplex Collector’s Page details the history and identification of Vibroplex semi-automatic telegraph keys, commonly known as "bugs." It traces the evolution from Horace G. Martin's 1902 Autoplex, which required a battery, to the fully mechanical Vibroplex patented in 1904. The resource explains how these keys generate automatic dots and manual dashes, helping telegraphers mitigate Repetitive Motion Disorder (RMD) and increase sending speed, thus improving their earnings. The site also covers the initial design by Alfred Vail in 1844, Jesse Bunnell's 1881 "Triumph Key," and William O. Coffe's 1904 "Mecograph." This page assists owners in identifying their Vibroplex models and determining their manufacturing dates, providing insights into the company's long history and notable figures like J. E. Albright. It notes that approximately 300,000 Vibroplexes have been produced since 1904, with the Original model still in production after more than 90 years. The resource also touches upon various Vibroplex models, including unusual, scarce, and common types, alongside legal and illegal clones from other manufacturers.

Using portable battery power is always a challange when operatin amateur radio in sota oprations. This article is about implementing lithium iron phosphate cells (LiFePO4) in ham radio portable operations.

How to do a capacity check on your battery pack. Videos demonstrate how to test the capacity of a 4S 10Ah LiFePO4 Headway pack

Enables Android users to operate various _miniVNA_ antenna analyzers via Bluetooth, USB, or Wi-Fi, providing a portable solution for RF measurements. The application supports full control over data acquisition, offering features like custom frequency range selection from 1 KHz to the VNA's full range, and automatic screen adaptation for diverse Android device resolutions. It facilitates intuitive, wizard-based calibration for both reflection and transmission modes, saving calibration data for different VNA types (Standard, Pro, Pro with Extender) to avoid repeated procedures. The software displays critical parameters such as SWR, |Z|, Return Loss, Phase, Rs, and |Xs| on 2-axis graphs or Smith charts, with multi-touch gestures for zoom and frequency shift. It includes a frequency generator mode with independent channels and attenuator control for the miniVNA Pro, along with a sweeper function. The cable data mode automatically calculates phase and loss, measures cable length from less than 1 meter to hundreds of meters, and includes a table of common coax cable velocity factors. An experimental X-tal mode measures resonance frequency, Rs, and Q. Data export options include CSV, ZPLOT, and S1P formats, with CSV import capability. The application also features an SM6ENG Audio mode for SWR tuning without visual reference and provides a miniVNA battery voltage indicator. It supports a wide frequency range, with the miniVNA Extender extending coverage up to **1500 MHz**. The application is compatible with Android version 2.2 and later, tested on devices like the _Galaxy TAB 7.7 P6800_.

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

Turning an RV marine battery into a massive 12-volt emergency power source

Mint tin transformed into a switched 9v battery to Anderson PowerPole

DC plug adaptor using an XT60 connector. 18650 Lithium battery 3 cell carrier, Three band end fed half wave antenna, XT60 chassis mounted flange.

Large collection of 1900's antique Radios for sale,Floor model, Cathedral, table top, Novelty, Battery, police and broadcast band image gallery

These pricey battery-powered devices are the only type of generator that can be used indoors safely. The article reviews pro and cons of power stations evaluating runtime, power delivery, power quality, ease of use, and noise.

A home made battery charger 110-220 v AC providing from 1.25-24 v DC Adjustable at 8 Amps output power, with Short Circuit Protection Over Load and over charge Protection.

Professional Lithium-ion battery packs factory in Shenzhen China with more than 11 years experience in Battery business. Manufactured of Lithium ion and lithium polymer battery and Lithium battery packs.

The article highlights the common absence of modern USB-C ports on handheld ham radios and the limited use of USB for power. The author, [jephthai], shares a solution involving a USB-C cable with power negotiation capabilities, allowing the radio to be powered by USB. By splicing Anderson power pole connectors onto the cable, the radio can now be conveniently powered by a USB battery bank, providing a practical alternative to traditional 12 V batteries for off-grid operations.

This project details the creation of a portable GoBox housing an IC705, Windows 11 PC, and Bluetooth microphone. The robust setup, enclosed in a weatherproof Hofbauer Explorer Case, ensures stability and functionality for QRP and emergency radio activities. The aluminum-mounted devices minimize RF interference, and a built-in LifePO4 battery powers the 10.1 TFT touch LED monitor, providing approximately 12 hours of use in receive mode. With a focus on grab-and-go versatility, this GoBox stands as an efficient solution for outdoor ham radio operations.

The article describes how to build a 12V emergency power supply for amateur radio stations. Starting with a basic jump-start system, the author upgraded it using a Group 27 deep-cycle battery and a 45W photovoltaic solar system, adding connectors and outputs for various devices. The system is portable, affordable (under $100), and capable of powering a station for 20 hours. The author emphasizes keeping batteries charged with a float charger and offers assistance to fellow club members interested in building their own power supply.

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.

A LiFePO4 battery box build project made with 25Ah 3.2V LiFePO4 prismatic cells, 40A 4s1p BMS with Bluetooth, 10A Buck/Boost converter

A portable QRP setup based on 20/30/40m QRP CW-only SW-3B transceiver, 2500mAh 5C LiPo battery (147g), Hands Free Nanokeyer

This innovative antenna tuning unit (ATU) enables QRP operators to match their antennas without transmitting RF signals. Using a noise bridge technique instead of traditional transmit-and-tune methods, it achieves truly silent operation. The design incorporates an L-match network with switched inductors and variable capacitor, handling impedance matching from 3-30MHz. Operating from a 9V battery, it includes a built-in RF power meter and dummy load for QRP transmitter testing. The compact unit is particularly suitable for portable operations where minimal RF emissions during tuning are desired.

This is a handy little charger that can provide a charging current of up to 120 mA continuously for batteries in the range up to 12 volts. The supply is housed in a small plastic enclosure 90 x 55 x 32 mm.