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Autotena, a Taiwanese manufacturer, offers a diverse product line focused on RF communication antennas and related accessories. The resource details various antenna types, including **4G/3G LTE wideband high-gain low-profile antennas**, land mobile wideband antennas, fiberglass omnidirectional designs, and GPS mobile and marine antennas. Specific amateur radio offerings include NMO VHF load coil gain antennas, VHF whip gain antennas with PL-259 connectors, and UHF NMO mount antennas with 3dB/5dB gain. The company also produces antennas for CB and 10-meter amateur bands, such as aluminum broadband 26-30MHz antennas and big copper coil broadband 26-30MHz antennas. Additionally, the site showcases **RF amplifiers** for CB, HF, VHF, and UHF bands, including professional-grade base station amplifiers with 100% EIA duty cycle. Handheld antennas, PL-259 type mobile antennas, magnet mount antennas, and external CB speakers are also presented, alongside various mounting kits and cable assemblies.

Demonstrates the construction of two distinct wideband RF preamplifiers, detailing their component requirements and performance characteristics. The first design leverages monolithic microwave integrated circuits (MMICs) such as the MAR-6, MAR-8, or PGA103, offering a broad frequency response from DC to 2 GHz with a gain of 22.5 dB at 100 MHz and a noise figure typically below 3 dB. This MMIC-based amplifier incorporates protection against power supply transients and features a 50 Ohm input/output impedance, operating from an 8-20 volt supply with low current drain. The second preamplifier design utilizes a BSX-20 transistor, providing amplification across the 14 MHz to 550 MHz range. This simpler, more economical build achieves an average gain of 12 dB at 145 MHz and a noise figure of approximately 1.1 dB. It operates from a 7-15 volt battery supply with a current draw of 6 mA. Both projects emphasize critical construction techniques, such as maintaining short RF connections, ensuring 50 Ohm impedance paths, and mounting the circuit within a shielded enclosure to optimize performance and minimize noise. The resource also discusses phantom power options for antenna-mounted preamplifiers and precautions for use with transceivers, including output protection diodes and static bleeders.

Manuf RF power amplifiers wideband+narrowband for Commercial, Defense, OEM and amatuer markets. Also low-noise rf amplifiers

Details the construction of a **wideband noise source** for HF filter alignment, specifically targeting transceivers such as the Elecraft K2. The design modifies a Down East Microwave (DEMI) MMIC amplifier board, part number MMICPCB, by integrating a 1N4735A zener diode, 560-ohm resistors, and 4.7 nF, 10 nF, and 22 µF capacitors. This modification enables the board, originally configured for a MAR-6 MMIC (with MAR-1 as an alternative), to generate noise suitable for procedures like the K2's "CAL FIL" function. The resource provides a **schematic** and a comprehensive bill of materials, including specific component values for replication. It outlines the practical steps involved, such as removing the input connector and integrating the new components into the existing MMIC amplifier board layout. The output is optimized for wideband HF applications, ensuring compatibility with various filter alignment tasks. This project focuses on practical implementation, demonstrating how to repurpose readily available components for a critical test instrument. It offers a cost-effective alternative to commercial noise sources, leveraging existing amateur radio hardware for enhanced station maintenance and performance.