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Design your VHF UHF Yagi antenna online, a JavaScript enhanced web page that implements the design of an antenna for 2m and 70cm bands. This page offers a streamlined experience for Yagi antenna design enthusiasts. It assumes prior knowledge of Yagi design principles, minimizing distractions with a user-friendly interface. Equipped with essential equations, it provides instant design feedback. Red font warnings indicate design limitations, ensuring practical results. Constraints include Gain (11.8-21.6 dBd) and Boom Length (2.2-39 wavelengths), with additional frequency-dependent restrictions noted in input fields.

An Easy Dual-Band VHF/UHF vertical Antenna made with a TV twin lead and coax cable

Cheap Yagi Antennas for VHF/UHF

Build Your Own Bazooka Dipole: A VHF/UHF vertical dipole made from coax

Presents the official online presence for Yaesu, a prominent manufacturer of radio communication equipment. The site details their extensive product lines, encompassing amateur radio transceivers, antenna rotators, tuners, amplifiers, and various accessories like microphones, speakers, and power supplies. It functions as a central hub for product information, specifications, and support resources. The resource categorizes its offerings across several key areas, including **Digital Mobile Radio (DMR)** solutions, HF/VHF/UHF transceivers, and specialized receivers and scanners. Each product section typically includes model numbers, feature highlights, and often links to manuals or technical documentation, providing hams with essential data for equipment selection and operation. Beyond amateur radio, the site also covers Yaesu's contributions to aviation and marine radio sectors, illustrating the company's broader scope in wireless communication technology. It serves as a direct portal for accessing manufacturer-provided details, ensuring accuracy and currency for those researching Yaesu gear.

The 144-430 portable j-pole antenna is designed for amateur radio operators seeking a lightweight and efficient solution for VHF and UHF communications. This antenna is particularly useful for portable operations, allowing hams to set up quickly in various locations while maintaining excellent performance. Constructed from readily available materials, it can be easily homebrewed, making it an ideal project for both beginners and experienced operators alike. The j-pole design offers a simple yet effective configuration that provides a good match across the 144 MHz and 430 MHz bands. Its vertical polarization and omnidirectional radiation pattern make it suitable for local communications and simplex operations. This antenna can be deployed in various environments, whether in the field or at home, and is well-suited for mobile applications. With proper construction techniques, operators can achieve optimal performance, enhancing their ability to make contacts during contests or casual QSOs.

Make your own VHF/UHF folded dipoles from aluminium tubing. Learn tips for folding yagi, softening the tubing, bending jig and make all waterproofing

A 1/4 wavelength resonator design for dual-band VHF/UHF operation is presented, focusing on a robust mobile antenna construction. The design prioritizes stability against environmental influences over raw gain, making it suitable for general use rather than marginal signal areas. It details the antenna's two sections: a UHF-resonant lower conductor and an upper coil functioning as an RF choke for UHF and an inductance enhancer for VHF, forming a resonant circuit. Detailed mechanical structure and material considerations are provided, including the use of a PL-259 plug base, 2mm copper rod, and PVC faucet tube for the coil form. The guide outlines a precise construction procedure, from soldering the copper rod to the PL-259 to winding the 22 SWG laminated wire for the VHF section. Tuning involves careful cutting of the UHF section and adjusting the coil length and pitch for VHF, using a reflectometer and temporary ground planes. Furthermore, the resource describes converting the mobile antenna for base station application by constructing a dual-band ground plane system. This involves using electrical conduit, EMT connectors, SO-239 sockets, and a 4-inch round-pan with threaded stainless steel rods as ground elements. Practical test results indicate optimal lengths of **70mm** for UHF and **350mm** for VHF ground elements, with a recommendation to cut rods with _30mm_ extra length for fine-tuning.

Yagi plans and notes for 6m, 2m, 70cm and 23cm

A 9 dB gain 70cm collinear antenna construction is detailed, utilizing eight half-wavelength sections of _RG58/U_ coaxial cable. The design incorporates specific calculations for velocity factor (0.66 for RG58/U) to determine precise element lengths, such as 223mm for a half-wavelength at 444 MHz. A quarter-wave radiating element of #16 solid wire, 169mm long, is added to the top, and a 160mm aluminum tube acts as a quarter-wave counterpoise at the feed point. RF choke baluns, constructed from three _FT50-43_ toroids, are positioned a half-wavelength from the feed point to mitigate common mode current. Assembly involves soldering the coax sections in series, followed by SWR testing during construction and final mounting within a ¾-inch PVC pipe. The article suggests using four half-wave elements for a shorter antenna, noting a potential slight increase in SWR, which can be mitigated with quarter-wave ground radials. The design principles and formulas are scalable for other VHF/UHF bands like 6m, 2m, or 1¼m, providing a versatile homebrew solution for enhanced gain.

Explains what amateur radio entails, detailing its dual role as a hobby and a public service, enabling communication among licensed operators using diverse radio equipment for self-training, recreation, and public service. It clarifies that ham radio operators require a government license, regulated globally by the ITU via the IARU, and outlines the privileges and responsibilities that come with operating an amateur radio station, including restrictions against commercial use and broadcasting to the general public. The resource then enumerates various activities hams engage in, such as worldwide HF communication, local VHF/UHF contacts, QRP operation, Packet Radio, Amateur Television, Slow Scan TV, contesting, and satellite communications. It also covers emergency and volunteer services, traffic handling, and the process of becoming a licensed amateur radio operator in the United States, mentioning local clubs, Elmers, and self-study as preparation methods for the FCC multiple-choice test.

Presents a web-based DX cluster interface, F5LEN Webcluster, which functions as a member node within the broader European DX Cluster network. It displays current DX spots across a wide range of amateur radio bands, from VLF through SHF, including specific bands like 1.8 MHz, 144 MHz, and 10 GHz, as well as satellite operations on QO-100. The service offers filtering options for various modes and activities, such as CW, QRP, IOTA, and specific VHF/UHF bands. Operators can access real-time propagation data, including Solar Flux Index (SFI), Sunspot Number (SSN), Kp index, and Auroral activity (Au), alongside tools for solar forecasts and tropospheric ducting predictions. The platform facilitates DX spotting by providing a centralized point for sharing and viewing contact information, aiding in DX hunting and contest operations. It also includes links to an Atlas, Sun tools, and a mobile version for portable access.

Details the construction and optimization of antenna systems for amateur radio satellite operations, focusing on practical, homebrew solutions for VHF/UHF bands. It covers building _groundplane antennas_ from salvaged materials, recycling old beam antennas into new configurations like a 2-meter crossed yagi, and constructing a 10-meter horizontal delta loop. The resource also explains antenna matching techniques, including folded dipole driven elements and quarter-wave transformers, along with the importance of accurate SWR measurements and minimizing coax loss. Demonstrates how to achieve a **1:1 SWR** by carefully trimming elements and adjusting radial angles on groundplane antennas. It provides insights into selecting appropriate coax and connectors, highlighting the benefits of Belden 9913 for low loss and the proper installation of _N-connectors_. The article also addresses RFI mitigation from computer birdies and presents a design for a silent triac antenna control circuit, offering practical solutions for common satellite station challenges.

If you want a top-performance VHF/UHF Long Yagi, you will probably have to build it yourself.

Operating on the HF bands, Kenwood's TS-990S and TS-890S transceivers represent their flagship offerings, providing advanced features for DXing and contesting. My personal experience with Kenwood gear, particularly the TS-590SG, confirms their reputation for solid receive performance and clean transmit audio, often noted in pileups. The TS-590SG, a popular choice for many hams, delivers reliable performance across the HF and 6-meter bands, making it a versatile station centerpiece. For VHF/UHF enthusiasts, the TH-D75A tribander offers 144, 220, and 430 MHz capabilities in a portable form factor. This handheld unit integrates D-STAR and APRS functionalities, appealing to operators who value digital modes and location-based services on the go. The inclusion of 220 MHz, a less common but valuable band, expands its utility for regional communications and specialized nets. Kenwood's enduring presence in the amateur radio market, dating back to 1955, underscores a commitment to quality and innovation. Their product range, from high-end base stations to feature-rich portables, continues to support a wide array of operating styles and technical requirements within the ham community.

Programming a new VHF/UHF radio usually proves to be a frustrating experience for most new amateur radio operators. A new radio must first be programmed for simplex and repeater operation before it can be used to communicate with local hams.

WiNRADiO Communications, a division of Radixon Group, was established in 1996 to commercialize extensive research in radio communications. The company specializes in integrating radio and computing technologies, offering a diverse product range for government, military, security, and amateur radio enthusiasts. Their product line includes the WR-G65DDCe 'EXCALIBUR Sigma' HF/VHF SDR receiver, noted for its capabilities, and the G31DDC EXCALIBUR, recognized for its price/performance ratio in shortwave listening with improved AMS and Noise Blanker features. The company also produces the G39DDC series EXCELSIOR for serious monitoring, WR-G526e/G527e/G528e modular SDR solutions for high-performance applications like phase-coherent direction finding, and the low-cost WR-G305e/G305i VHF/UHF receivers. Professional counterparts, the WR-G315e/G315i, support APCO P25 decoders and trunking options. WiNRADiO's offerings extend to the PFSL-G3 field strength logging system for mobile signal coverage, advanced multichannel telemetry systems like the MS-8323, and specialized antennas such as the AX-31C Log-Periodic and AX-81S active HF antenna. DRM decoder software is available for G3 Series receivers, enabling clear reception of DRM broadcasts. The WSS-420 Weather Satellite Receiving System and various antenna rotators are also part of their product ecosystem. WiNRADiO supports multiple operating systems, with MacRadio for Apple Macintosh users and LiNRADiO for Linux developers, providing drivers and network receiver solutions like the RLX-810.

This program descrambles band inverted encrypted transmissions, usually found on VHF/UHF. It uses a NCO (numerical controlled oscillator) to re-produce the originally inverted audio band. Use it only if legally permitted in your country. I assume no responsabilities deriving from its use. Standard disclaimer applies

Normal mode helix antennas offer a solution for HF mobile operators facing significant height restrictions, such as those parking in indoor garages with limited overhead clearance. This design, adapted from concepts typically applied to VHF/UHF rubber duck antennas, allows for extremely shortened HF radiators that remain effective for county hunting and general mobile operation. The resource details the construction of a 20-meter helix antenna, approximately 10 inches long, wound with #14 AWG THHN wire on a 1 1/2-inch CPVC form, mounted on a standard 3/8 x 24 antenna stud. Mark Herson, _N2MH_, shares his experience developing these antennas, including initial research from the _RSGB VHF UHF Manual_ and practical winding experiments to establish the relationship between turns and resonant frequency. He provides coil data for various frequencies, emphasizing that these measurements were taken with an _MFJ-259a_ antenna analyzer and are dependent on the vehicle's grounding system. Despite their shortened nature, N2MH confirms the antennas' operational effectiveness, citing contacts with KL1V in Alaska on 20 meters and E-skip contacts on 10 meters. The design prioritizes continuous deployment without removal, making it suitable for operators who frequently navigate height-restricted environments.

Alinco's factory in Toyama, Japan, holds ISO9002/140001 certification, underscoring its commitment to quality manufacturing processes for amateur radio equipment. The company produces a diverse range of products, including HF transceivers, mobile VHF/UHF radios, handhelds, and scanners, serving both new and experienced operators within the ham radio community. Their product line extends beyond transceivers to encompass essential accessories such as antenna tuners and power supplies, which are crucial for complete station setups. These offerings support various operating environments, from portable field operations to fixed home stations, ensuring versatility for radio amateurs. Alinco, Inc. Electronics Division is headquartered at Yodoyabashi Dai-Bldg 13F, 4-4-9 Koraibashi, Chuo-ku, Osaka 541-0043 Japan, maintaining a global presence in the amateur radio market.

WSJT-X, a creation of K1JT, offers specialized digital protocols meticulously optimized for challenging propagation paths such as EME (moonbounce), meteor scatter, and ionospheric scatter. This software excels at VHF/UHF frequencies, and also provides robust performance for LF, MF, and HF DXing, enabling contacts far below the audible threshold. The program decodes signals from ionized meteor trails and steady signals more than 10 dB below the audible threshold, a testament to its advanced digital signal processing. It integrates nearly all popular features from its predecessors, WSJT and WSPR, while adding comprehensive rig control and numerous other enhancements for the serious weak signal operator. Available for Windows, Linux, and Mac OS X, WSJT-X is an open-source project, allowing hams worldwide to download the latest versions and engage in cutting-edge weak signal communication.

The FT-817 is a small 5W MF/HF/VHF/UHF transceiver with internal batteries. Here is an assortment of technical information K6XX put together about this rig that might interest you.

The finest in VHF/UHF antennas for Amateur and Commercial Applications. Antennas and Repeater Controller Accessories includes Rutland Arrays.

HF VHF/UHF yagi and quad antennas, towers and headphones manufactured in holland

Antenna for GSM, CB, marine, VHF/UHF, HAM and high frequency 1,9/2,4GHz

Low (or zero) Cost Accessories for the FT-817 Portable QRP MF/HF/VHF/UHF Transceiver

A full line of repeaters, modules to build repeaters, and accessories.

Over 65 years of radio manufacturing experience underpins Icom's extensive product line, ranging from handheld VHF/UHF transceivers to sophisticated HF base stations. The company's global website serves as a central hub for product information, technical specifications, and support resources for its diverse range of communication equipment. Hams can explore detailed specifications for popular models like the _IC-7300_ and the _IC-9700_, alongside commercial and marine radio offerings. The site provides access to product catalogs, firmware updates, and user manuals, ensuring operators have the necessary documentation for their Icom gear. Information on new product releases and technological advancements in radio communication is regularly updated, reflecting the company's ongoing commitment to innovation in the amateur radio market. Icom's presence extends across various radio segments, including D-STAR digital voice, marine, avionics, and land mobile, demonstrating a broad engineering capability beyond just amateur radio.

Yaesu FT-817 Portable QRP MF/HF/VHF/UHF Transceiver, an assortment of technical information

This program descrambles band inverted encrypted transmissions, usually found on VHF/UHF. It uses a NCO (numerical controlled oscillator) to re-produce the originally inverted audio band.

WinLink 2000 employs Stations World-wide to provide an HF/VHF/UHF digital radio Interface into the Internet Email system for the mobile radio operator. Features include binary and graphic file attachments, APRS position reporting and over 340 downloadable WX products. The mode used is Pactor I and Pactor II.

Broadcastify currently hosts 7,266 live public safety radio feeds, providing real-time scanner audio for police, fire, and EMS operations. The platform aggregates transmissions from various emergency services, allowing users to monitor local dispatch and response activities across numerous geographic areas. It functions as a centralized hub for streaming publicly accessible radio traffic, distinctly separate from amateur radio operations or traditional _DXing_ pursuits, focusing instead on unencrypted public safety communications. The resource primarily focuses on public safety radio systems, which typically operate on VHF/UHF frequencies, often employing trunked radio system architectures. It does not involve amateur radio bands but rather provides direct access to publicly available emergency service communications. The content is organized into categories like Top Feeds, New Feeds, and Official Feeds, facilitating navigation through its extensive catalog. Broadcastify's utility stems from its efficient aggregation and streaming infrastructure, offering a direct link to local emergency dispatch and response. The platform also details its operational mechanics and lists official providers, indicating a structured approach to content sourcing and distribution.

Full line of VHF/UHF handheld and and mobile transceivers and accessories

Tuning control of the Yaesu FT-736R multiband VHF/UHF transceiver.

Looking for Hams that want to experiment on VHF/UHF PSK/digital modes

Arrow-Style VHF/UHF portable satellite antenna by VE2ZAZ

Maidenhead grid maps for VHF/UHF, These maps make excellent wallpaper for your contest setup.

This blog is about utility and military monitoring in the HF/VHF/UHF range.

A portable dualband dipole robust and compact antenna usable for horizontal and vertical polarisation by ON6MU

Wideband VHF/UHF/SHF monolithic PreAmp based on MARx-series by ON6MU

Dual Band VHF/UHF Slim Jim Antenna project

A full line of single-channel synthesized and crystal controlled vhf and uhf fm receivers. Great for repeaters, telemetry, and control applications.

WSJT-X and MAP65, open-source amateur radio programs, facilitate weak-signal digital communication. WSJT-X covers VHF/UHF to HF, decoding subthreshold signals. MAP65 optimizes for VHF/UHF EME with JT65. Free and GNU GPL licensed, WSJT-X is on Windows, Linux, and OS X, while MAP65 is Windows-only, supporting SDR hardware.

Free VHF/UHF/Microwave contest logging software for rovers and non-rovers - Runs under Linux, Windows, etc.

Antenna was designed for SO-50 satellite operation but can be used for any VHF/UHF activity. It's a mix of a Moxon Antenna and a Yagi antenna. It has gains 4 dBd on 2m and 6.5 dBd on 70cm bands and it is fed via single 50 Ohm cable.

Illustrates the specific wiring and configuration steps required to interface an SGC-230 Smartuner with an Icom IC-706 HF/VHF/UHF transceiver. The document details the necessary connections for power, control, and RF signal paths between the two devices, ensuring proper impedance matching and automatic antenna tuning functionality. It specifies the pin assignments for the IC-706's ACC socket and the SGC-230's control port, crucial for successful integration. Outlines the operational considerations for the combined system, including initial setup procedures and potential troubleshooting tips for common connectivity issues. The resource presents a clear, diagrammatic representation of the interconnections, which aids in visual comprehension of the required cable fabrication or modification. Covers the specific settings within the IC-706 menu that need adjustment to enable external tuner control, such as the 'TUNER' function and other relevant parameters. This ensures the transceiver correctly communicates with the SGC-230 for efficient antenna tuning across various amateur bands.

A must read guide for all new and old operators. This document was originally written with the prime focus on DXing and pileup behavior. Suggestions by proofreaders have been implemented; the document is not as narrowly focused anymore as originally intended. It contains hints, tips and tricks for newcomers as well as old-timers. Additionally there are VHF/UHF operational matters, DX Cluster ethics, COPS, Conflict Situations and more.

Presents the detailed construction of the _FLA25HV_ antenna, a specialized array optimized for Earth-Moon-Earth (EME) communications on the 2-meter band. This resource provides schematics and practical insights into building a high-gain antenna system capable of reflecting signals off the lunar surface, a challenging but rewarding aspect of amateur radio. It covers the mechanical and electrical considerations essential for achieving the precise pointing and signal strength required for successful moonbounce contacts, often yielding **20 dB** or more gain. Amateur radio operators pursuing EME operations require robust antenna systems and precise tracking capabilities. The FLA25HV design addresses these needs by focusing on element spacing, impedance matching, and structural integrity to withstand environmental factors while maintaining critical alignment for lunar reflections. Such systems are crucial for making contacts over distances exceeding **768,000 km**. This personal page serves as a practical guide for hams interested in constructing their own EME arrays, offering a glimpse into the technical dedication involved in pushing the boundaries of VHF/UHF propagation.

VHF/UHF DX site showing latest propagation, software, radio dealers, awards, maps etc.

A _Topfkreis_ antenna, also known as a "bicycle pump" antenna, is presented as a simple vertical design for the 70 cm band. This variant of the J-pole antenna is notable for not requiring a ground plane, simplifying deployment. The construction details specify using aluminum tubing for the radiating element, with precise measurements for the quarter-wavelength outer tube (32 mm diameter) and the three-quarter wavelength inner sliding tubes (10 mm and 8 mm). Feeding is via a 50-ohm coaxial cable connected 90 mm from the base of the central tube. This design can achieve a gain of **4 to 6 dB** when properly tuned using the adjustable radiating element. The article details the fabrication of a critical aluminum washer, suggesting a method using a hole saw and a drill press as a lathe for precise adjustment. The illustrated example is specifically for the 70-centimeter band, and the author, Pop, clarifies construction points in the comments, including material choices and assembly techniques, ensuring a robust build for VHF/UHF operation.