Microphone compressor using two transistors

Microphone compressor using two transistors: 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.

Radio Waves Weekly — Issue #007

Radio Waves Weekly — Issue #007: This week: 3Y0K is finally on the air from Bouvet Island — the most remote uninhabited island on Earth — and the pile-ups are epic. The Rebel DX Group is next up with a Kanton Island activation starting March 25. Plus a pocket-sized Indian SDR that does FT8 without a computer, the freshest QRP Labs kit, two wire antennas you can build this weekend, and a handful of contests and events to fill your log before spring.

Sporadic E Propagation: The Science Behind Long-Distance FM Radio Reception

📡 Why did you just hear a radio station from 1,000 km away?

It sounds like magic — but it's pure atmospheric science. Sporadic E Propagation (Es) happens when dense ionized clouds form in the E layer of the ionosphere, bending FM signals back to Earth far beyond their normal range.

This in-depth article from vu3dxr.in covers everything: ✅ The science behind Es clouds ✅ Peak seasons (hint: June solstice is prime time!) ✅ Skip zones and multi-hop paths ✅ Best receivers, SDRs & antennas for FM DX ✅ Pro tips for catching openings in real time

Whether you're a seasoned ham or just curious about that mysterious distant station — this is a must-read!

🔗 https://vu3dxr.in/sporadic-e-propagation-the-science-behind-long-distance-fm-radio-reception/

#HamRadio #RadioDX #SporadicE #FMRadio #RadioPropagation #SDR #AmateurRadio

Build a Multi-Band Doublet Antenna for Wideband HF Operation

Build a Multi-Band Doublet Antenna for Wideband HF Operation: Learn how multi-band doublet antenna works, why it’s a favorite among HF operators, and how a simple balanced wire antenna cover multiple amateur radio bands