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This page describes a fix to the Low Pass Filter that provides more filtering of the second harmonic of 144-148 MHz.

The resource provides specific technical details for Baofeng UV-3R and UV-5R series handheld transceivers, illustrating various hardware configurations. It presents a detailed _speaker microphone pinout_ diagram for multiple brands, including Baofeng, Anytone, Kenwood, and Wouxun, specifying 3.5mm and 2.5mm plug connections for mic, PTT, speaker, and data lines. The page also explains the wiring for dual PTT switching, particularly for the Baofeng UV-82 series, showing how to key either the upper or lower display channel. Furthermore, it offers comprehensive schematics and construction guidance for programming cables, detailing connections for CP2102 USB-UART modules to 3.5mm and 2.5mm plugs, and providing specific configurations for radios like the BTech UV-2501/5001 and QYT KT8900. The content also addresses SMA antenna connections, clarifying SMA Female, SMA Male, and SMA RP types, and discussing issues related to extended antenna threads, suggesting solutions like using a #8 O-Ring to ensure proper contact and prevent transmitter damage. The resource includes a section on troubleshooting erratic charger behavior, attributing issues to poor contact from tension clips and offering a simple fix.

Video on Baofeng uv-3r menus

UV-3R Review at G4ILO Blog with long textual review, pictures and some sound files

UV-3R reviews at eham.net

This group is for support and discussion of the Baofeng UV-3R micro dual band VHF/UHF radio.

Kings county repeater association review of the Baofeng UV-3r

A modification of the UV3R Baofeng handheld transceiver to improve the built in low pass filter

KA7OEI modification to LPF for the Baofeng UV3R