DIY Antennas, QRP, SDR & Ham Radio Projects from VU3DXR
Explore technical amateur radio projects and DIY guides at VU3DXR. Discover tutorials on RF circuits, receiver mods, and digital modes. Start building today
This article explains how the HydraSDR RFOne enters the SDR market as a direct competitor to the Airspy R2, offering similar core performance with a few key differences.
It highlights a wide frequency range (24 MHz–1.8 GHz), 12-bit ADC, and up to 10 MSPS sampling, making it suitable for spectrum analysis and amateur radio use. The main differentiator is its open-source firmware, which allows customization and community-driven development
NOAA-15 & NOAA-19 shutdown in Aug 2025 ends APT signals. Hobbyists: explore Meteor-M2, GOES, & SDR skills to keep decoding weather satellites data.
This microphone compressor circuit utilizes a two-stage amplification design for dynamic range control. Initially, the input signal enters through MK1, a microphone input connector. Subsequently, the signal passes through C1 and C3 coupling capacitors for DC blocking. The first amplification stage employs Q1, a 2N3904 transistor configured as a common emitter amplifier. Meanwhile, R1 provides […]
Colombo International Radio Tamil service – Inaugural day transmissions Frequency – 873khz Time – 7.00 am to 8.00 am The 872 kHz frequency represents a fascinating chapter in the story of Tamil broadcasting from Sri Lanka, though the actual frequencies used by the Sri Lanka Broadcasting Corporation (SLBC) for their international Tamil service are slightly […]
AIR MUMBAI DRM Reception in my listening post at Krishnagiri(TN) using MSI SDR dongle. KTWR Dxers diary DRM Reception with same set up available here.
All India Radio – Rajkot DRM channel 1071 khz – medium wave band Reception noted in my MSI SDR dongle…good signal with occasional break in audio. Location – Krishnagiri 635108 Equipment – MSI.SDR Dongle Software –Sdruno 1.4 & DREAM Decoder Antenna – 66 feet Longwire antenna tuned for amateur bands
Digital Audio Broadcasting: Looking into the future Digital Audio Broadcasting: Looking to the Future A World Perspective – And Status in the USABy D. Prabakaran Digital Audio Broadcasting (DAB) has the potential to transform the traditional audio-based radio medium into a full-fledged multimedia system, particularly suited to bringing digital information to the general public, […]
WebSDR India Location – Bengaluru, India | http://106.51.131.254:8073/ Windows: Firefox, Chrome & Edge work; IE does not work. Mac & Linux: Safari, Firefox, Chrome & Opera should work fine. Open and close the panels by using the circled arrows at the top right corner. You can click and/or drag almost anywhere on the page […]
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