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HF/6M antenna tuner preselector and antenna switcher project by ON6MU

Demonstrates how to construct an automatic band decoder, moving beyond manual selector switches for antenna and filter control. It addresses the challenge of varying band data outputs from different transceivers: Icom rigs provide voltage values, Yaesu rigs use Binary Coded Decimal (BCD), and Kenwood rigs lack direct band data output. The resource highlights a clever solution utilizing logging software like _CT (K1EA)_ and _DX4WIN_ to emulate Yaesu's BCD output via a PC's printer port, making the decoder compatible with any rig. The author details experiences building decoders based on designs by Bob _K6XX_ and Guy _ON4AOI_, noting K6XX's simple TTL chip design and ON4AOI's more comprehensive, opto-isolated unit capable of controlling ten outputs and bandpass filters like the _Dunestar_. It also references a _W9XT_ board design, which Steve Wilson, G3VMW, modified with BD140 transistors for source drivers, emphasizing safety. The author successfully cased an ON4AOI-based decoder in an old modem case, connecting it to an FT1000MP or a PC printer port to drive remote relays and a Dunestar Band Pass Filter.

An home made antenna switch with a Dummy Load selector. If you forget the radio is connected to the open or grounded side of the switch and you try to transmit, it is very easy to damage the finals of your transceiver.

A 15-pin data switch, typically a rotary-knob type designed for DB-25 connectors, forms the basis for this microphone selector project. The resource details the conversion process, which involves replacing the original DB-25 connectors with **RJ-45** or **RJ-12** jacks to accommodate modern amateur radio microphones. It specifically addresses wiring for radios like the Icom IC-706 series (including the IC-7000 and IC-703) and Yaesu transceivers such as the FT-857, FT-897, FT-817, FT-7800, FT-7900, FT-8800, FT-8900, FTM-100, and FTM-400. The design ensures all microphone lines are switched straight through, with separate contacts for external speaker/headphone jacks, allowing simultaneous switching. The project emphasizes the practical application of switching between a headset for net control and a hand mic for rag-chewing without repeatedly plugging and unplugging cables. It highlights modifications to the original concept, such as eliminating a separate PTT jack by integrating PTT into headset cables and building the external speaker cable directly into the selector. The article provides guidance on managing the non-color-coded wiring often found in these data switches by soldering wires one by one from old to new connectors, ensuring correct pin alignment. This approach simplifies the conversion, making it accessible for hams seeking a functional and cost-effective mic switching solution.

Presents RigOne, a radio controller application designed for Windows 10 (later releases) and Windows 11, with a macOS version under active development. The software provides core operational controls such as tuning, VFO following, signal metering, and audio management, emphasizing a clean interface for everyday use. It supports native Icom direct control, with the **IC-7300** serving as the primary tested profile, and integrates **Hamlib** for broader compatibility across various transceivers. The resource details specific features, including frequency and mode read/write, VFO A/B switching, quick mode/band selectors, and switchable analog-style or horizontal-bar signal meters. For the IC-7300, RigOne offers an integrated panadapter, waterfall display, native VOX control, and Twin PBT controls, leveraging live scope data for an enhanced visual operating experience. The application focuses on essential functions, avoiding unnecessary clutter. It outlines the latest version, v1.2.5.1, highlighting updates like a compact layout selector for Tall mode, direct frequency entry, and refined fixed 16:9 panel layouts. The page also clarifies hardware compatibility, noting extensive testing with the IC-7300 via USB/COM CI-V, and invites user feedback for expanding Hamlib support to other radio models, ensuring the software evolves based on real-world amateur radio station use.

Manufacturer of software definded radio receivers, antenna switches, preselectors, antenna splitters based in Italy and USA

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.

Open Two Radio Switching Protocol Antenna Selector on ATMEL ATmega8 microcontroller