Simple 2N3904 microphone preamplifier for uBITX V3–V6 transceivers that fixes low mic audio and restores full transmit power. Powered from the MIC+ line with adjustable gain for clean, natural SSB modulation.
Tag: ubitx
Explore uBITX HF QRP transceiver projects on DXR Electronics Bits, including microphone preamps, audio and AGC upgrades, Nextion display and CEC firmware tools, and digital-mode operation guides. Learn practical modifications to improve transmit audio, receiver dynamics, and overall performance of uBITX V3–V6.1 radios.
Nextion Emulator for CEC Firmware — Alpha1 Release Brings uBITX Simulation to Desktop
The Alpha 1 release of the Nextion Emulator for CEC firmware — a Python-based emulator that brings full desktop simulation of CEC/uBITX radios with Nextion HMI.
Fixing Poor Audio Quality in uBITX V6.1 HF Transceiver
The uBITX V6.1 is a popular amateur radio transceiver kit. It’s designed for ham radio operators who enjoy building their own equipment. Moreover, it offers great value for money and covers multiple frequency bands. However, like many DIY kits, it sometimes needs tweaking to perform at its best. uBITX V6.1 – My Audio Problem Story […]
SSM2167 Microphone Preamplifier with compression for ubitx HF Transceiver
This project uses an SSM2167 IC as a complete microphone preamplifier with built-in compression and noise gating to improve uBITX transceiver audio. It boosts mic gain, reduces dynamic range, and suppresses background noise, resulting in clearer, louder, and more consistent transmitted speech.
VK3YE’s AGC circuit for ubitx
VK3YE’s AGC circuit for ubitx An ubitx AGC board is a circuit board that can be installed in a ubitx transceiver to provide automatic gain control (AGC). AGC is a feature that automatically adjusts the gain of the transceiver’s amplifier to maintain a constant audio output level, regardless of the strength of […]
Video – Belgaum HF Net reception
Belgaum HF net reception monitored in my ubitx3 Receiver – Ubitx v3 Transceiver, 66 ft Endfed Halfwave antenna Belgaum’s strategic location in northern Karnataka, near the borders of Maharashtra and Goa, makes it an ideal hub for regional HF communications. The city’s elevated geography and relatively low RF noise environment contribute to excellent propagation conditions, […]
Video – ubitx3 with nextion display
ubitx3 with nextion display Demo of ubitx3 with nextion display reception in my shack. The uBITX v3, developed by Farhan VU2ESE, serves as an excellent foundation for this upgrade. Built around the Arduino Nano platform, this QRP transceiver covers all HF amateur bands from 80 to 10 meters with approximately 10 watts output power. The […]
Video – Reception test of my ubitx v3 with nextion 2.8 inch screen
ubitx3 with nextion screen Reception test of my ubitx v3 multiband SSB Transceiver with Nextion 2.8 inch touch screen. Barbaros WB2CBA has modified his stock µBITx v6 kit to use the Nextion 2.8″ TFT LCD display.To help his fellow Ubitx V6 owners who want to use a nextion display in their rig, Barbaros has provided […]