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Ham Radio . Magnum Experimentum

Antennas, experiments, engineering and other articles of interest to radio folks.

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  • Radio Shorthand
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    • Phonetic Alphabet
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    • RST Signal Report
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    • Logging Software
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    • Activities
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    • contesting
    • Connectors
    • Digital Modes
    • EmComm
    • Installations
    • interfaces
    • Introspection
    • Lab Shootouts
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    • mobile
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    • power supply
    • Accessories
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sdr

KX4O SDR Receiving Electronics

January 18, 2023January 8, 2023
SV1AFN J310 Preamp into Mini-Circuits Limiter

With a bit of work, one can successfully feed an array of LF-HF receivers from one broadband antenna.

Categories Electronics Tags 43 foot, DXE, HF, kiwisdr, LF, MF, Minicircuits, sdr, spotting, SV1AFN, WSPR

Higher Fidelity OpenWebRX 1.0.0

December 20, 2021December 19, 2021
AM Wide Mode for OpenWebRx SDR Server

Some simple tweaks to a few text files try to make OpenWebRx more compatible with wider AM and FM RF bandwidths.

Categories Software Tags AM, bandwidth, FM, openwebrx, sdr, Web

Thermal solutions for the Raspberry Pi

October 19, 2020
Argon One Raspberry Pi 4 case inserts showing the machined heatsink pedestals.

Recent metal case offerings from Raspberry Pi enclosure manufacturers help mitigate heat issues when you dare try process-heavy applications including amateur radio spotting servers.

Categories Computing Tags computer, heatsink, openwebrx, raspberry pi, sdr

Airspy YouLoop LF/MF/HF Möbius Receive Antenna

September 27, 2020September 11, 2020

The Airspy YouLoop is a no tune, broadband, small footprint, affordable LF to HF receive antenna that works indoors. Its modular construction facilitates experiments to understand where the Möbius inspired electrical design provides benefit.

Categories Antennas Tags airspy, Baluns, LF, MF, Mobius, Moebius, raspberry pi, sdr, shielded loop, small loop, YouLoop

Using AM to explain the value of radio bandwidth

April 25, 2020

Today’s new SDR options and compatible software provide new ways to demonstrate radio technology to the next generation of STEM students.

Categories Miscellaneous Tags Camtasia, Console, rspduo, sdr, sdrplay

Demo of TDoA using the SDR.hu network

March 11, 2020

Quick demonstration of Time Difference of Arrival (TDoA) technique to correlate a common transmitted signal on multiple receivers to find the transmitter’s location.

Categories Miscellaneous Tags geolocation, gps, sdr

WWVB DX Virgin No More

September 2, 2018August 26, 2018

Thanks to a spiffy new Airspy HF+ SDR receiver I can scratch listening to WWVB off the bucket list.

Categories Propagation Tags airspy, GC-1000, heathkit, LF, NIST, sdr, SWL, wwvb

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2m 6m 10m 15m 20m 40m 43 foot 70cm 80m AHVD APRS Baluns battery BigIR copper Diamond dipole DX-Eng. EFHW Elecraft end-fed EZNEC Field Day Golden Packet hexbeam J-Pole Kenwood kj4faj KX3 kx4o measurement mobile NEC NMO NVIS packet PL259 QRP sdr Simulation SteppIR UHF vertical dipole verticals VHF

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