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Skip to content HAM RADIO . MAGNUM EXPERIMENTUM Antennas, experiments, engineering and other articles of interest to radio folks. Menu * Home * Radio Shorthand * Morse Abbreviations * Morse Code * Phonetic Alphabet * Q Signals * RST Signal Report * Tech Talk * Antenna Gain * Antenna Counterpoise * Digital * Logging Software * Amateur Radio, Why? * About * Privacy Policy * Terms and Conditions * Request Account * Contact * Sitemap * Advertise * Subjects * Activities * Antennas * contesting * Connectors * Digital Modes * EmComm * Installations * interfaces * Introspection * Lab Shootouts * Miscellaneous * mobile * NEC Shootouts * News * Operating Tips * power supply * Accessories * Promoting * Propagation * Public Service * Radios * Repair * Reviews * Safety * Software * station * Test Gear * Tomfoolery * Whackers * Menu * Home * Radio Shorthand * Morse Abbreviations * Morse Code * Phonetic Alphabet * Q Signals * RST Signal Report * Tech Talk * Antenna Gain * Antenna Counterpoise * Digital * Logging Software * Amateur Radio, Why? * About * Privacy Policy * Terms and Conditions * Request Account * Contact * Sitemap * Advertise * Subjects * Activities * Antennas * contesting * Connectors * Digital Modes * EmComm * Installations * interfaces * Introspection * Lab Shootouts * Miscellaneous * mobile * NEC Shootouts * News * Operating Tips * power supply * Accessories * Promoting * Propagation * Public Service * Radios * Repair * Reviews * Safety * Software * station * Test Gear * Tomfoolery * Whackers * KX4O SDR RECEIVING ELECTRONICS October 23, 2024January 8, 2023 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 WOLF RIVER COILS – SILVER BULLET VS. SILVER BULLET PLATINUM 1000 March 17, 2022March 16, 2022 We examine the differences between the original and higher power version of Wolf River Coils’ Silver Bullet 1000 tunable loading coils. Categories Antennas Tags coil, HF, inductor, mobile, Wolf River, WRC HIGHER FIDELITY OPENWEBRX 1.0.0 December 20, 2021December 19, 2021 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 COPPER EFFICIENCY AFTER WEATHERING July 4, 2021 I use a weathered copper small transmitting loop to see if copper oxide affects antenna conductivity and hence efficiency. Categories Antennas Tags bandwidth, copper, oxidation, oxide, S11, STL, VSWR NELSON ANTENNAS 2M ROLLUP ANTENNA REVIEW January 20, 2021January 10, 2021 Review of the smallest portable 2m antenna on the market producing full size dipole performance and stows into your pocket. Categories Antennas, Reviews Tags 2m, hiking, J-Pole, portable, Slim JIM THERMAL SOLUTIONS FOR THE RASPBERRY PI October 19, 2020 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 DIAMOND ANTENNA NR770HBNMO WITH K515SNMO MOBILE ANTENNA REVIEW January 1, 2021September 30, 2020 After three years of mobile operation, I review the Diamond Antenna NR770HBNMO with appropriate K515SNMO mount including pattern measurements. Categories Antennas, mobile Tags 2m, 440, 70cm, Diamond, K515, measurement, mobile, NR770HBNMO 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 ANATOMY OF A LOW FREQUENCY AVIATION RADIO BEACON January 1, 2021May 18, 2020 Aviation LF/MF beacons provide the opportunity to admire electrically-small antenna design on a macroscopic scale. Categories Antennas Tags Aviation, beacon, LF, measurement, MF, monopole, tophat 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 ROOF-RACKING VHF ANTENNAS ON SUV January 1, 2021April 7, 2020 Thule roof rails increased my VHF antenna mounting options on my Subaru Forester. Categories Antennas Tags 2m, 6m, 70cm, Aluminum, Diamond, Forester, measurement, Subaru, Thule, VHF 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 “EFFECTIVE ENCRYPTION” EFFECTIVELY DEBUNKED February 2, 2020February 2, 2020 Months of research prove the notion compressed data over ARQ modem techniques is anything, but effective encryption. Categories Digital Modes Tags modem, NTS, Pactor, SCS, Winlink VHF MAGMOUNT VS. HOLE-MOUNT PERFORMANCE COMPARISON January 1, 2021January 4, 2020 Much has been said about the electrical disadvantages of using a magnetic mount for your VHF/UHF mobile needs. Measurements compare the magmount to a thru-hole NMO mount. Categories Antennas Tags mag mount, measurement, NMO, VHF “HOLIDAYS IN THE HEART” TELEGRAPH DEMO – HOW EDUCATING THE NEXT GENERATION IS DONE September 11, 2020November 28, 2019 Promoting amateur radio means to first promote technology and this American morse demo does just that. Categories Promoting Tags American Morse, education, telegraph WILL THE REAL POLYPHASER PLEASE STAND UP January 1, 2021November 17, 2019 One example of a PolyPhaser through panel protector makes one wonder if I have a counterfeit or has QC taken a turn for the worse. Categories Miscellaneous Tags lightning, measurement, Polyphaser, surges THE J-POLE ANTENNA IS HEREWITH FIXED January 1, 2021November 14, 2019 For what it’s worth, the myths surrounding the J antenna have been sorted out resulting in an improved version. Categories Antennas Tags EFHW, end-fed, J-Pole, measurement HOW TO WIN WITH HF MOBILE NVIS October 16, 2019October 14, 2019 Data from W4GO’s Virginia QSO Party operation confirms how well NVIS works from his SUV. Categories mobile Tags 80m, mobile, NVIS ADDING 0.05 WAVELENGTH WIRE TO EFHW ANTENNA August 28, 2019 I add a 0.05 wavelength wire to my previous end-fed vs. center-fed dipole tests and plot the results. Categories Antennas Tags counterpoise, EFHW, end-fed BOB, THE BATTERY OPERATED “BEACON” FOR APRS August 4, 2019July 29, 2019 I built a prototype APRS beacon, dubbed Thor Hammer (big), to test back-packable APRS 2m beacon concepts. Categories Portable Tags 2m, APRS, backpack, Byonics, dipole, EFHW, end-fed, hiking, Laird, Larsen, N, NMO, portable, PVC, SMA BEACH FISHING FOR QSOS WITH AN STL July 27, 2019July 17, 2019 Add amateur radio to your beach trip keeping in mind family life balance. Categories Activities Tags 13 colonies, 40m, beach, Elecraft, fishing, Hatteras, KX3, OBX, small loop, STL, Thirteen Colonies ELECTRICALLY ISOLATED END-FED VS. CENTER-FED DIPOLE RADIATION January 1, 2021June 3, 2019 Testing confirms an end-fed dipole can energize the radiator nearly as well as a center-fed without need of additional counterpoise or other extraneous conductors. Categories Antennas Tags center-fed, dipole, EFHW, end-fed, half wave, measurement, raspberry pi WIN A REPEATER FROM BRIDGECOM May 26, 2019 Win a Bridgecom System repeater system. Categories Miscellaneous ENERGIZER LITHIUM VS. ALKALINE BATTERIES January 1, 2021May 23, 2019 Some APRS beacon tests provide data directly comparing the energy performance of Energizer alkaline and lithium AA cells. Categories power supply Tags AA, APRS, battery, cell, energizer, Energizer Lithium, Energizer MAX, LiFeS2, lithium, measurement Older posts Page1 Page2 … Page13 Next → HELP SUPPORT THIS SITE TOPICS & KEYWORDS 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 © 2007-2024 John Scott Huggins and other authors and creators, All Rights Reserved.