Overview

The Omni RF Loop On Ground Receive Antenna Kit combines the dedicated LOG transformer and matching wire element into one complete antenna. The design is based on the well-known Loop On Ground concept, using a wire loop laid directly on the ground and fed through an isolated ferrite transformer to deliver quieter HF reception. The Omni Flex element is available in two sizes: 18.3 m total loop length with 4.6 m per side, or 30.5 m total loop length with 7.6 m per side. The smaller version follows the original-style layout, while the larger version is better suited to lower bands. The transformer uses genuine Fair-Rite cores, enamelled copper wire, a custom turn ratio, stainless hardware, and a UV-resistant ASA enclosure. The Omni Flex element uses finely stranded pure copper wire with low-memory black polyolefin insulation for easy deployment and long service life.

Key Features

• Complete Loop On Ground receive antenna kit with transformer and wire element
• Receive-only design for reduced local noise pickup on HF
• 50 ohm system design with SO239 UHF connector
• Choose between 18.3 m total loop length with 4.6 m per side or 30.5 m total loop length with 7.6 m per side
• Omni Flex element made from 22-strand pure copper wire with 0.75 mm conductor size
• Flexible zero-halogen polyolefin insulation with very low memory effect
• Rated for use from -25 to +90 °C [-13 to +194 °F]
• Genuine Fair-Rite transformer core for low-loss performance, especially on lower bands
• ASA enclosure with galvanised steel mounting peg for outdoor use
• A2 stainless steel hardware and wing-nut element connections for simple installation
• Low visual impact for discreet home, portable, or field receiving setups

Typical applications

This receive antenna kit is ideal for HF DX listening, contest receive improvement, low-band listening, shortwave monitoring, and amateur radio stations suffering from elevated local noise on transmit antennas. It is especially attractive for operators on city lots, in suburban gardens, or in stealth-focused locations where a full-size raised receive antenna may be impractical or too visible. Because the loop sits directly on the ground, it can often be installed with minimal visual impact and without drawing attention from neighbors or visitors.

Specifications

Why choose the Omni RF Loop On Ground Receive Antenna Kit

• Delivers quieter HF reception by helping reduce local noise and improve weak-signal readability
• Offers useful directional preference that can be optimized during installation for better signal-to-noise ratio
• Choice of 18.3 m or 30.5 m loop size lets you balance available space against lower-band performance
• Ground-level deployment makes this a practical solution for city lots, smaller gardens, and stealth-focused stations
• Fast, low-profile installation with minimal visual impact and no need for tall supports
• Built with durable outdoor-ready materials for dependable long-term use

What’s included – In the Box

• 1 x Omni RF Loop On Ground Transformer in SO239 UHF 50 ohm version
• 1 x Omni Flex Loop On Ground Element in selected length
• 1 x Galvanised steel transformer ground peg
• 4 x Galvanised steel element ground pegs
• 1 x Instruction set

Setup Guidance

Choose the 18.3 m version when you want the smaller original-style layout, typically installed as an approximately 4.6 x 4.6 m square. Choose the 30.5 m version when you want the larger layout, typically installed as an approximately 7.6 x 7.6 m square, which is generally better suited to the lower bands.

For best results, deploy the loop directly on the ground in as square a shape as your space allows. A square Loop On Ground fed at one corner can show a broad directional preference at low angles, but the exact pattern depends on loop symmetry, ground conditions, nearby structures, and frequency. In practice, the best approach is to rotate the square and compare signal-to-noise ratio on your target signals. Keep the loop symmetrical, avoid routing the feedline alongside the loop, and keep the feedline away from household noise sources where possible.

Adding a good-quality common mode choke at the feedline can help reduce unwanted noise currents on the coax shield. In lower-signal setups or where you need extra gain to overcome coax loss or receiver limitations, a low-noise receive preamp can also be beneficial.

Choose the Omni RF Loop On Ground Receive Antenna Kit when you want a cleaner listening experience, a tidy installation, and a complete ready-to-deploy package for serious HF receiving. It is a smart upgrade for any operator who knows that hearing more often starts with lowering the noise floor, especially when available space is limited and antenna visibility needs to stay low.

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LiNK500MP TNC (MK2) is an advanced communications interface designed for the TX500MP, combining wireless audio, wireless CAT control, USB audio, APRS tracking, Bluetooth connectivity and built-in GPS in one compact, rugged unit. It is built for amateur radio operators who need a flexible solution for portable operation, digital modes, emergency communication and field deployment.

Overview

The LiNK500MP TNC (MK2) expands the capability of the TX500MP by integrating multiple operating functions into a single purpose-built device. It supports modern digital-mode workflows with a simplified station layout, while reducing cable clutter through wireless audio transmission and wireless CAT control. Its CNC-milled aluminum housing is designed for demanding outdoor and portable use, making it a strong fit for operators who value durability, transportability and dependable operation in real-world conditions.

For users running FT8, JS8Call, VARA, VarAC, APRS or packet applications, the LiNK500MP TNC (MK2) provides a practical bridge between transceiver and computer or mobile device. With USB audio, Bluetooth support and integrated control features, it helps create a cleaner, faster-to-deploy portable setup.

Key Features

• Designed specifically for the TX500MP radio
• Wireless audio transmission for cable-free digital-mode operation
• Wireless CAT control for remote transceiver control without physical cabling
• USB audio interface for digital-mode software integration
• Internal USB hub architecture
• Supports AX.25 packet protocol for AFSK and RPR operation
• Integrated audio, CAT and data interfaces
• Built-in GPS receiver for position data without requiring an external GPS antenna
• Built-in Bluetooth module compatible with iOS, Android, Windows, macOS and Linux
• Built-in APRS tracker for automatic position and status reporting
• Dedicated VFO knob for direct manual frequency tuning
• CNC-milled aluminum enclosure for rugged portable use

Typical Applications

• Man-pack portable and field radio operation
• Emergency communications and rapid deployment setups
• Digital-mode operation including FT8, JS8Call, VARA and VarAC
• APRS tracking and position reporting
• Packet radio and TNC-based data communication

Specifications

Why choose the LiNK500MP TNC (MK2)

• Combines multiple radio interfacing functions into one purpose-built unit for the TX500MP
• Reduces cable clutter with wireless audio and wireless CAT control
• Supports both portable field use and modern digital-mode operation
• Rugged aluminum construction helps it stand up to demanding operating environments

What’s included – In the Box

• LiNK500MP TNC (MK2) device
• Mounting kit for the TX500MP radio
• Manual

Performance notes / setup guidance

For best results, pair the LiNK500MP TNC (MK2) with a TX500MP in a well-planned portable or fixed setup where digital-mode software, APRS or packet functions are part of your operating plan. The built-in wireless audio and CAT features make it especially attractive when you want to minimize cables in the field. Operators using WSJT-X, JTDX, JS8Call, VARA or VarAC should verify software audio and CAT settings during initial setup to ensure smooth integration. Built-in Bluetooth and GPS can help streamline deployment, particularly for APRS and location-aware operation.

Upgrade your TX500MP with a compact all-in-one interface that brings together digital modes, APRS, wireless control and portable-ready durability in a single unit. Order the LiNK500MP TNC (MK2) today and build a cleaner, more capable field radio setup.

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• Cable length: 0.5 m (19.7 in)
• Connector type: GX12 2 pin

Compatibility:

• Transceiver TX-500 DISCOVERY
• Transceiver TX-500MP (via AD-511 adapter)

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The SQUARE SO-239 to SO-239 adapter is a precision-machined inline mounting and connection solution for amateur radio, field communications, and mobile antenna installs. Designed for operators who need a clean, modular way to join SO-239 equipped antennas or accessories to a standard 3/8″-24 mount, this adapter delivers strong mechanical support and efficient RF transfer in a compact format.

Overview

This adapter features two SO-239 female connectors and a 3/8″-24 male threaded base, making it ideal for antenna systems that need direct compatibility with common UHF-style connector hardware and standard threaded antenna mounts. It is well suited to portable deployments, mobile installations, bench testing, and modular station builds where quick equipment changes and dependable connections matter.

Key Features

• Dual SO-239 female connector configuration for direct inline RF connection
• 3/8″-24 male threaded base for standard antenna mounts and supports
• Suitable for HF, VHF, and UHF system integration
• Machined square-body construction for mechanical strength and corrosion resistance
• Useful for portable, mobile, base-station, and test-bench setups
• Supports fast equipment swaps without extra couplers in many configurations

Typical applications

• Portable HF field setups
• Mobile antenna installations on vehicle brackets or magnetic mounts
• Base-station antenna experimentation and modular station builds
• Bench testing, matching-unit connections, and temporary RF routing
• Rapid deployment communications kits

Specifications

Why choose the SQUARE SO-239 to SO-239 adapter

• Creates a straightforward connection path between SO-239 based components
• Helps build cleaner, more modular antenna systems with fewer workarounds
• Combines RF connectivity and mounting support in one compact part
• Built for operators who value reliable fit, durability, and quick deployment

What’s included – In the Box

• 1 × SQUARE SO-239 to SO-239 adapter with 3/8″-24 male threaded base

Performance notes / setup guidance

For best results, use the adapter with quality coax, clean connector interfaces, and a mechanically stable mounting point. Verify that your mount uses a 3/8″-24 female thread before installation. This adapter is a connection and mounting interface, so final RF performance will depend on the antenna, feed line, grounding or radial system where applicable, and the overall installation environment.

If you need a durable SO-239 to SO-239 adapter for a 3/8″-24 antenna mount, this is a smart choice for building a cleaner, more flexible station or field kit. Add it to your setup and simplify your next portable, mobile, or fixed-station deployment.

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• Weather-Resistant Design
• Speaker Power: 3 W
• Push-to-Talk (PTT) Switch
• External Speaker Port: 3.5 mm mono mini-jack socket
• Cable Length: 1 m (39 in)
• Connector Type: GX12, 6-pin

Compatibility:

• Transceiver TX-500 DISCOVERY

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• Cable length: 1.5 m (59 in)
• Connector type: GX12, 2-pin / Cigarette Lighter Plug

Compatibility:

• Transceiver TX-500 DISCOVERY
• Transceiver TX-500MP (via AD-511 adapter)

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The Airspy HF+ Discovery builds on the field-proven Airspy HF+ platform with added preselectors, refined filtering, and a new DSP core for improved gain distribution and real-time optimization. The result is a receiver that digs deeper into the noise while maintaining excellent linearity in crowded RF environments. Its architecture combines high dynamic range sigma-delta ADC technology, passive mixers with polyphase harmonic rejection, and band-tracking preselectors to help suppress unwanted signals and preserve usable dynamic range. For SWL, AM DX, FM broadcast DX, amateur radio monitoring, telemetry, spectrum analysis, and SIGINT-style receive applications, the HF+ Discovery delivers performance far beyond what its size suggests.

Key Features

• Coverage from 0.5 kHz to 31 MHz and 64 MHz to 260 MHz
• High dynamic range front end with strong blocker resistance
• HF sensitivity down to -140 dBm minimum discernible signal at 500 Hz bandwidth
• VHF sensitivity down to -141.5 dBm in the FM broadcast band and -141.0 dBm in the VHF aviation band
• Blocking dynamic range up to 110 dB on HF
• High-performance preselectors for HF, FM broadcast, and VHF ranges
• Polyphase tracking filters for close-range interference suppression
• 18-bit embedded digital down converter with up to 22-bit resolution at 3 kHz channel bandwidth
• Up to 660 kHz alias- and image-free output for 768 ksps IQ
• Very low phase-noise 0.5 ppm clock with 1 ppb frequency adjustment capability
• Plug-and-play operation with broad software support
• Ultra-compact enclosure measuring 45 x 60 x 10 mm (1.77 x 2.36 x 0.39 in)

Typical Applications

• HF and VHF amateur radio monitoring
• Shortwave listening and broadcast DXing
• AM, FM, and TV DX reception
• Spectrum analysis and signal hunting
• Telemetry and utility signal monitoring
• SIGINT/COMINT receive applications
• Remote SDR deployments with SpyServer

Specifications

Architecture

State of the Art SDR streaming technology!

We concentrated state of the art DSP and networking techniques into our SpyServer software to allow multiple users to stream high quality IQ data from the same receiver at the same time. No compromises in the quality were made like it is usually done in Web SDR interfaces. You get actual IQ data you can process with your plugins and extract the last bit of information out of it.
The server software is highly scalable and can run on computers as small as the $7 Orange Pi Zero to top end 64bit servers with multiple cores/cpus, including the popular Raspberry Pi series.

Why choose the Airspy HF+ Discovery?

• Excellent weak-signal performance with outstanding sensitivity and low internal noise
• Strong-signal resilience that helps maintain clean reception in crowded RF environments
• Broad software compatibility with popular SDR platforms including SDR#, SDR-Console, GQRX, HDSDR and more
• A proven design recognized by WRTH for delivering exceptional value in a compact, affordable SDR receiver

User Endorsements

The Airspy HF+ Discovery received the WRTH 2020 Best Value SDR award, with reviewers highlighting its combination of performance, versatility, and value. Independent reviewers have also praised it for delivering performance well above its price class and for being easy to use while still satisfying demanding listeners.

What’s included – In the Box

• Airspy HF+ Discovery receiver
• USB connection for power and data

Note: antenna, coaxial adapters, and SDR software are typically supplied separately unless otherwise stated in the product package.

Performance notes / setup guidance

For best results, pair the Airspy HF+ Discovery with a well-matched external antenna and quality coaxial feed line. In high-signal environments, use the built-in AGC intelligently and avoid unnecessary gain to preserve dynamic range. Airspy recommends adjusting attenuation so the noise floor remains around -100 dBFS when operating manually. For remote monitoring, the receiver also works well with SpyServer on compact single-board computers and low-power network hosts. This makes it an excellent option for fixed receive posts, remote DX stations, and shared SDR access over a local network or the internet.

If you want a compact SDR receiver that punches far above its size and price, the Airspy HF+ Discovery is one of the smartest upgrades you can make for serious HF and VHF listening. Add it to your station and experience cleaner reception, stronger weak-signal results, and a more capable SDR workflow from day one.

The post Airspy HF+ Discovery SDR Receiver appeared first on PileupDX.com.

The Airspy R2 is a compact, high-performance software defined radio designed for demanding VHF and UHF work. It uses a low-IF architecture built around the Rafael Micro R820T2/R860 tuner, a high-quality 12-bit ADC and advanced DSP to deliver strong real-world performance, including up to 16-bit resolution on narrowband channels in oversampling mode. For users who need more than entry-level SDR performance, the Airspy R2 offers a dependable platform for everything from wideband spectrum viewing to technical RF projects.

Overview

Built for users who care about signal quality, stability and software compatibility, the Airspy R2 covers 24 MHz to 1700 MHz natively and can be extended down to HF with the SpyVerter up-converter. It supports up to 10 MSPS IQ output, offers a panoramic spectrum view up to 10 MHz wide with up to 9 MHz alias/image-free, and includes features valued by advanced users such as external clock input, bias-tee power, high-speed GPIO and coherent array capability. It is fully compatible with SDR#, SDR-Console, HDSDR, GQRX, GNU Radio and other popular SDR software.

Key Features

• Continuous 24-1700 MHz native receive coverage
• Low-IF architecture with tracking RF filters
• 12-bit ADC at 20 MSPS with oversampling DSP
• Up to 10 MSPS IQ output
• Up to 16-bit resolution on narrowband channels in oversampling mode
• Up to 10 MHz panoramic spectrum view with up to 9 MHz alias/image-free
• 0.5 ppm high-precision low phase-noise clock
• External clock input from 10 MHz to 100 MHz via MCX
• 4.5 V software-switchable bias-tee for LNAs and converters
• Coherent receiver array and direction-finding capable
• Broad software support across Windows, Linux, *BSD and macOS
• HF extension possible with the SpyVerter up-converter

Typical applications

• VHF/UHF/SHF radio monitoring
• Wideband scanning
• ADS-B and ATC reception
• Direction finding
• Coherent receiver arrays
• Passive radar
• Satellite IF work
• Telemetry reception
• Radio astronomy
• Education and laboratory use
• Amateur radio and experimentation

Specifications

Why choose the Airspy R2

• Stronger dynamic range and cleaner spectrum performance than many low-cost SDR dongles
• Wide native tuning range for VHF, UHF and beyond without coverage gaps in the listed range
• Excellent ecosystem support with SDR#, SDR-Console, HDSDR, GQRX, GNU Radio and more
• Advanced hardware features such as external clocking, bias-tee and coherent array support for serious projects

What’s included – In the Box

• Airspy R2 SDR receiver

Performance notes / setup guidance

• For best wideband performance, use a modern PC that meets or exceeds the recommended hardware requirements.
• The experimental 2.5 MSPS mode is useful for lower-power hosts such as Raspberry Pi class devices, but it is not recommended where maximum performance matters.
• To extend coverage below 24 MHz, pair the Airspy R2 with the SpyVerter up-converter.
• The built-in 4.5 V bias-tee can power compatible LNAs and up/down-converters directly from the receiver.
• Users building phase-coherent or precision-frequency systems can take advantage of the external clock input.
• For easiest setup, pair the receiver with SDR# or other supported software from the Airspy ecosystem.

If you want a proven wideband SDR that goes well beyond basic USB dongle performance, the Airspy R2 is an outstanding choice for advanced listening, scanning, decoding and RF development work. Order today and build a more capable receiving station with a receiver trusted by enthusiasts, reviewers and developers worldwide.

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73
Julian OH8STN

LIMITED EDITION personally signed by Julian, order today before it sell out!

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