analog

analog

Pages: [prev] 1 2 3 4

• Kydera - A high-technology enterprise specializing in the R&D, production and sale of two-way radio equipment for over twenty years. DMR Radio, Digital and analog portable radio manufacturer based in China
  [ Hits: 32 | Votes: 0 | Rating: 0 ]

• Ribbit digital text messaging mode for HF/VHF/UHF - Ribbit is a novel digital text messaging mode for VHF/UHF communications for recreational and emergency use which radically increases the density of information transmitted by spectrum used. It leverages the computing power of the modern smartphone to increase the capabilities of any Handy Talkie without requiring any additional hardware or cable. A Ribbit message is fixed in duration at 1250 milliseconds. It is sent over audio modulation with a 2kHz bandwidth centered on 1.5kHz. It is preceded by 400ms of white noise to open analog squelch circuits.
  [ Hits: 133 | Votes: 1 | Rating: 10 ]

• FT-817 Audio Speech Compressor: Boosting Signal Power with SSM2165 - Designed for the FT-817, this audio speech compressor, centered on the Analog Devices SSM2165, offers a 40 dB compression range, enhancing signal power. Built externally with the SMD version to preserve warranty, the circuit interfaces smoothly with electret microphones. Testing shows a 6 dB average power increase. Adaptable to rigs with electret microphones, it maintains unity gain and 40 dB compression.
  [ Hits: 60 | Votes: 0 | Rating: 0 ]
• Yaesu FT-817 Audio Enhancement: Heathkit-inspired Homebrew Project - Inspired by Heathkit, author aimed to enhance his Yaesu FT-817 with audio and RF processing. Design goals included a compact enclosure, PCB simplicity, matching jacks, a visual meter, and a built-in signal generator. Despite challenges in finding a suitable compressor IC for a 5V DC mic jack, he chose the Analog Devices SSM2165/2166 series. Prototyping with a solderless breadboard, author planned a PCB layout for its versatile performance in communication use.
  [ Hits: 80 | Votes: 1 | Rating: 2 ]

• You and Your Tytera MD-380 - Getting started with a fun low-cost analog/DMR radio
  [ Hits: 89 | Votes: 0 | Rating: 0 ]
• Retevis RT3 Tytera MD-380 Modifications - Collection of modifications for the Retevis RT3, a monoband handheld transceiver for DMR (digital voice) and analog FM. It is almost identical to the Tytera MD-380.
  [ Hits: 106 | Votes: 0 | Rating: 0 ]

• How Wide Area Radio Systems works - This webpage explains how analog wide area two way radio systems were setup by various states before systems like VIPER, PALMETTO 800, or FLEETNET were established.
  [ Hits: 145 | Votes: 0 | Rating: 0 ]

• AllScan - AllScan is a free and open-source web app for AllStar nodes that provides Favorites Management features, AllStarLink Stats integration, and connection monitoring and control functions. Shows your favorites in a Dashboard summary table with Keyed status, Connected Node count and other statistics. Continually scans the status of each favorite using ASL's Stats API data showing which favorites are active and have recently been active. Allows favorites to be connected with a single click (optionally automatically disconnecting any currently connected nodes first). Allows the Favorites Table to be sorted by Node#, Name, Description, Location, etc. Favorites can be added/deleted simply by entering the node# and clicking a button. These features finally give AllStar nodes similar memory management and scan capabilities that analog radios have had for decades. AllScan is mobile-friendly and optimized for ease of use on both small and large screens. AllScan follows the latest web development standards, with PHP, JavaScript, HTML, and CSS cleanly partitioned, runs on both ASL and HamVOIP, and is very easy to install, configure, and update.
  [ Hits: 20 | Votes: 1 | Rating: 8 ]

• Building an Enhanced APRS IGate with Debian 12 and Raspberry Pi - The guide outlines necessary components, including a 2m FM analog radio, USB audio adapter, and Raspberry Pi. Building a cable to connect these elements is assumed, as is knowledge of Raspberry Pi OS installation.
  [ Hits: 57 | Votes: 0 | Rating: 0 ]

• Digital SWR and Power Meter - This module is an analogue and digital SWR and power meter/monitor, designed to replace analogue SWR and power metering in an AM Transmitter project.
  [ Hits: 267 | Votes: 0 | Rating: 0 ]

• RF Impedance Matching Calculator - Calculates the network to match a line to a specific complex load. This online tool calculates the matching network necessary to terminate a line of the specified characteristic impedence Zo in a specific complex load impedence RL + jXL at a specified frequency.
  [ Hits: 194 | Votes: 1 | Rating: 10 ]

• A Simple Hybrid Software Defined Radio - This Hybrid SDR is a combination of a current technology analog radio techniques, used with a direct conversion software defined radio to create a single conversion "hybrid" radio that is usable over a wide range of frequencies
  [ Hits: 115 | Votes: 0 | Rating: 0 ]

Pages: [prev] 1 2 3 4