DIY Antennas, QRP, SDR & Ham Radio Projects from VU3DXR
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 […]
The GEK 2x SSB Transceiver is a Mid range high performance Low-noise, low cost SSB HF transceiver. The local oscillator is stable DDS VFO and DDS BFO/Carriers oscillator. The Power amplifier is designed as a push-pull Mitsubishi the latest generation of 12V-30MHz Silicon MOSFET Power Transistor. The RD06HHF1 is used in the pre driver and […]
Master Your Amateur Radio License: Complete ASOC study Guide for Indian Hams Getting your Amateur Station Operators Certificate (ASOC) in India opens the door to the exciting world of ham radio communication. Whether you’re 12 years old or 80, this comprehensive ebook by D. Prabakaran provides everything in ASOC study guide you need to pass […]
Belgaum HF net conducted at 7050khz using RSP1 SDR Receiver – MSI.SDR dongle, 66 feet endfeed halfwave antenna Location – Krishnagiri
All India Radio chennai -A DRM digital transmission reception at my listening post in Krishnagiri Receiver – MSI SDR with long wire antenna. Location – Krishnagiri 635108 Equipment – MSI.SDR Dongle Software –Sdruno 1.4 & DREAM Decoder Antenna – 66 feet Longwire antenna tuned for amateur bands Video – AIR RAJKOT DRM Reception
The Dark Room Timer circuit described here provides a pleasant musical tone in your darkroom at 1-second intervals. The circuit takes up very little space and can be easily converted into a metronome. Unijunction transistor T1 functioning as a relaxation oscillator triggers phase-shift audio oscillator circuit turning it on and off. Capacitor C1 is charged […]
This Shortwave Transmitter circuit operates in shortwave HF band (6 MHz to15 MHz), and can be used for short range communication and for educational purposes. The Shortwave Transmitter circuit consists of a mic amplifier, a variable frequency oscillator, and modulation amplifier stages. Transistor T1 (BF195) is used as a simple RF oscillator. Resistors R6 and […]
A simple logic probe in concert with a signal source can be used to check digital as well as linear circuits. With the flick of a switch, the probe can inject a test signal or check the logic state of a digital signal. Comprising just one CMOS IC (CD4011B) and a handful of components, the […]
Here is a high performance RF amplifier using MAX2633 for the entire VHF band that can be successfully built without any special test equipment. The grounded -gate configuration is inherently stable without any neutralisation if reasonably good layout techniques are employed. The performance of the amplifier is quite good. The noise figure is below 2dB […]
Tutorial on Spread Spectrum Technology Author – D.Prabakaran Spread spectrum technology has blossomed from a military technology into one of the fundamental building blocks in current and next-generation wireless systems. From cellular to cordless to wireless LAN (WLAN) systems, spectrum is a vital component in the system design process. Since spread-spectrum is such an integral […]