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Nouvelles des Amis - DxZone |
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The DXZone.com Amateur Radio Internet Guide
Latest articles, reviews and links posted to The DXZone.com, an amateur radio, cb radio, scanning and shortwave radio, reference site
Top Amateur Radio Websites - Issue 2412
Space-Efficient Excellence: Inverted L Multi-Band HF Antenna, WSJT-X Controller, Introduction to HF Packeteering in the Modern Age, Emergency ham radio frequencies, AI Projections for Ham Radio Modes in 2023-2025, Yaesu ATAS-120A Portable Tripod: Enhancing Efficiency, Mapping the Australian Radio Landscape, FT 1000MP MK V and Keyclicks, ... / ...
Top Amateur Radio Websites - Issue 2412
Space-Efficient Excellence: Inverted L Multi-Band HF Antenna, WSJT-X Controller, Introduction to HF Packeteering in the Modern Age, Emergency ham radio frequencies, AI Projections for Ham Radio Modes in 2023-2025, Yaesu ATAS-120A Portable Tripod: Enhancing Efficiency, Mapping the Australian Radio Landscape, FT 1000MP MK V and Keyclicks, (01/01/1970 : 01:00)
Top Amateur Radio Websites - Issue 2411
Portable Half-Square Antenna, The Squid Pole Wire Antenna Re-visited, 50 MHz 300W Power Amplifier, TX5S Clipperton 2024, TX5S Log Online, Efficient 2-Element Quad Antenna for 2m, Propagation on 630 Meters and 2200 Meters, N1FD Nashua Area Radio Society
(01/01/1970 : 01:00)
WSJT-X 2.7.0 Release Candidate 4 available
WSJT-X 2.7.0 Release Candidate 4 has been officially made available to the public. This RC version brings improvements primarily aimed at Fox-mode operators and enhancements to the QMAP companion program.
(01/01/1970 : 01:00)
Top Amateur Radio Websites - Issue 2410
Field-Tested VP2E Antenna, 3 Band Mono Loop Portable Quad, VHF Repeater with a Raspberry Pi, DIY Tree Antenna Launching: Cheap and Effective, OpenRTX, Wire on the Ground: Portable Radio Success with Grasswire Antenna, LoRa APRS Tracker or Igate on 433Mhz, IARU Region 2 BandPlan,
(01/01/1970 : 01:00)
Top Amateur Radio Websites - Issue 2409
Mini Satellite-Antenna Rotator Mk1, Receiving NOAA Weather Satellite Images, Online LInked Dipole Designer, How to use AI to identify Radio signals , LoRa in Amateur Radio, Moxon Mania - Building the Ultimate 4-Band Moxon Antenna, Python Telegram bot for QRZ.com lookups
(01/01/1970 : 01:00)
ICOM IC-R20
IC-R20 by Icom. Wideband Receiver Professional radioreceiver, allow double receiver, from HF to Microwave, digital recorde, DTCS, Memories and 11 hours countinuous reception.
(01/01/1970 : 01:00)
UniBalun: Lightweight Balun/UnUn PCB for QRP Radios (1:1, 1:4, 1:49)
Antennas/BalunsThe UniBalun is a PCB for building a lightweight antenna transformer (Balun) or impedance converter (UnUn) for low power radios. By soldering jumpers and a toroid core, you can create a 1:1, 1:4 Balun or 1:49, 1:9 UnUn. The latest revision (1.2) includes improved pads and supports both BNC and SMA connectors. Build instructions are available for German speakers. ... / ...
UniBalun: Lightweight Balun/UnUn PCB for QRP Radios (1:1, 1:4, 1:49)
Antennas/BalunsThe UniBalun is a PCB for building a lightweight antenna transformer (Balun) or impedance converter (UnUn) for low power radios. By soldering jumpers and a toroid core, you can create a 1:1, 1:4 Balun or 1:49, 1:9 UnUn. The latest revision (1.2) includes improved pads and supports both BNC and SMA connectors. Build instructions are available for German speakers. (01/01/1970 : 01:00)
Build a Lightweight 15m Yagi Antenna: Simple Design for Impressive Performance
Antennas/15MIn this article, Steve G0UIH presents a straightforward guide for constructing a lightweight 15m 3 Element Yagi antenna with impressive performance metrics. With a focus on ease of construction and efficiency, the design boasts a nearly 8.2dbi forward gain and 30db front to back ratio. Utilizing readily available materials and a hairpin match for impedance matching, this Yagi offers broad bandwidth and simple tuning for optimal operation across the 15m band. ... / ...
Build a Lightweight 15m Yagi Antenna: Simple Design for Impressive Performance
Antennas/15MIn this article, Steve G0UIH presents a straightforward guide for constructing a lightweight 15m 3 Element Yagi antenna with impressive performance metrics. With a focus on ease of construction and efficiency, the design boasts a nearly 8.2dbi forward gain and 30db front to back ratio. Utilizing readily available materials and a hairpin match for impedance matching, this Yagi offers broad bandwidth and simple tuning for optimal operation across the 15m band. (01/01/1970 : 01:00)
ARJAN-5 5 band SDR
Technical Reference/Software Defined RadioThis project enhances Arjan te Marvelde's uSDR-pico by integrating a waterfall display feature. By adding an ILI9341 240x320 2.4" TFT display and modifying the software, the goal is to provide a panadapter to the existing transceiver. Initially developed with Visual Studio, the code was later migrated to Arduino IDE for Raspberry Pi Pico compatibility. The focus remains on preserving the original software, primarily enhancing the dsp.c file for waterfall implementation. ... / ...
ARJAN-5 5 band SDR
Technical Reference/Software Defined RadioThis project enhances Arjan te Marvelde's uSDR-pico by integrating a waterfall display feature. By adding an ILI9341 240x320 2.4" TFT display and modifying the software, the goal is to provide a panadapter to the existing transceiver. Initially developed with Visual Studio, the code was later migrated to Arduino IDE for Raspberry Pi Pico compatibility. The focus remains on preserving the original software, primarily enhancing the dsp.c file for waterfall implementation. (01/01/1970 : 01:00)
Icom 706MK2G Repair
Radio Equipment/HF Transceivers/Icom IC-706After years of reliable performance, a 26-year-old Icom 706MK2G exhibited an unusual deviation during FM transmission, with the actual frequency being 10kHz off from the displayed frequency. Additionally, the power meter showed a sharp dip during transmission. Upon investigation, it was discovered that the FM VCO voltage adjust variable had become dirty and sluggish over time. By adjusting the variable capacitor and cleaning it with switch cleaner, the issue was resolved, restoring stable power output and accurate frequency transmission. ... / ...
Icom 706MK2G Repair
Radio Equipment/HF Transceivers/Icom IC-706After years of reliable performance, a 26-year-old Icom 706MK2G exhibited an unusual deviation during FM transmission, with the actual frequency being 10kHz off from the displayed frequency. Additionally, the power meter showed a sharp dip during transmission. Upon investigation, it was discovered that the FM VCO voltage adjust variable had become dirty and sluggish over time. By adjusting the variable capacitor and cleaning it with switch cleaner, the issue was resolved, restoring stable power output and accurate frequency transmission. (01/01/1970 : 01:00)
3 Element Quad for 50 MHz
Antennas/6MA 14.12 dBi gain three elements cubical quad antenna for the six meters band.
This Quad Antenna design page include a MMA model available to download and dimensions for each element.
(01/01/1970 : 01:00)
Mastering HF Communication: Decoding Space Weather Data
Propagation/Beginner's Guide The article enlightens radio amateurs on utilizing real-time space weather data to optimize HF communication. Navigating through Hp30 index, MUF, f0F2, and eSFI metrics, it explains their significance in band selection and propagation forecasting. With essential links and practical insights, enthusiasts learn to discern optimal conditions for high-band DX, low-band DX, and NVIS operations. The author's observations and antenna optimization tips enrich understanding for effective HF operations. ... / ...
Mastering HF Communication: Decoding Space Weather Data
Propagation/Beginner's Guide The article enlightens radio amateurs on utilizing real-time space weather data to optimize HF communication. Navigating through Hp30 index, MUF, f0F2, and eSFI metrics, it explains their significance in band selection and propagation forecasting. With essential links and practical insights, enthusiasts learn to discern optimal conditions for high-band DX, low-band DX, and NVIS operations. The author's observations and antenna optimization tips enrich understanding for effective HF operations. (01/01/1970 : 01:00)
Build a Simple VHF Dipole Antenna for 2 Meters: A Beginner's Guide
Antennas/2MThis article serves as a beginner-friendly guide to constructing a simple VHF dipole antenna for 2 meters, perfect for novices in the hobby. With an emphasis on affordability and simplicity, it explains the basics without overwhelming technical details. Recommendations for coaxial cable and mounting methods are provided, offering practical solutions for effective communication. By following these instructions, novices can build a functional antenna without breaking the bank. ... / ...
Build a Simple VHF Dipole Antenna for 2 Meters: A Beginner's Guide
Antennas/2MThis article serves as a beginner-friendly guide to constructing a simple VHF dipole antenna for 2 meters, perfect for novices in the hobby. With an emphasis on affordability and simplicity, it explains the basics without overwhelming technical details. Recommendations for coaxial cable and mounting methods are provided, offering practical solutions for effective communication. By following these instructions, novices can build a functional antenna without breaking the bank. (01/01/1970 : 01:00)
Homebrew uSDX TRX
Technical Reference/Software Defined RadioThe Homebrew uSDX SDR TRX is an experimental transceiver primarily designed for CW and Digital modes due to limitations in meeting FCC requirements for SSB. Developed from the QRP Labs QCX, it incorporates advanced SDR features while utilizing an 8-bit ATMEGA328P. The µSDX community fosters open-source development with various design streams and versions, encouraging collaboration and sharing among enthusiasts. ... / ...
Homebrew uSDX TRX
Technical Reference/Software Defined RadioThe Homebrew uSDX SDR TRX is an experimental transceiver primarily designed for CW and Digital modes due to limitations in meeting FCC requirements for SSB. Developed from the QRP Labs QCX, it incorporates advanced SDR features while utilizing an 8-bit ATMEGA328P. The µSDX community fosters open-source development with various design streams and versions, encouraging collaboration and sharing among enthusiasts. (01/01/1970 : 01:00)
Prevention and Suppression of RF Interference to Audio Systems
Technical Reference/Radio Frequency InterferenceIn this study, the author builds upon Muncy's research, demonstrating that radio-frequency current on cable shields affects audio systems through the "pin 1 problem" and shield-current-induced noise (SCIN). An enhanced equivalent circuit for ferrite chokes is proposed, addressing dimensional resonance and inductor self-resonance. Field tests confirm that chokes reduce interference across 500 kHz to 1,000 MHz. Guidelines for diagnosing and mitigating EMI from various sources are provided for product development and field installations. ... / ...
Prevention and Suppression of RF Interference to Audio Systems
Technical Reference/Radio Frequency InterferenceIn this study, the author builds upon Muncy's research, demonstrating that radio-frequency current on cable shields affects audio systems through the "pin 1 problem" and shield-current-induced noise (SCIN). An enhanced equivalent circuit for ferrite chokes is proposed, addressing dimensional resonance and inductor self-resonance. Field tests confirm that chokes reduce interference across 500 kHz to 1,000 MHz. Guidelines for diagnosing and mitigating EMI from various sources are provided for product development and field installations. (01/01/1970 : 01:00)
Chokes and Isolation Transformers for Receiving Antennas
Antennas/ReceivingChokes and isolation transformers are essential for receiving antennas to mitigate common mode current, which induces noise and interferes with signal quality. Common mode chokes, formed by winding feedline through ferrite cores, block unwanted current effectively. Proper selection of core material and winding turns ensures resonance near the operating frequency, reducing interference. Isolation transformers further minimize interference, crucial for multi-transmitter stations. ... / ...
Chokes and Isolation Transformers for Receiving Antennas
Antennas/ReceivingChokes and isolation transformers are essential for receiving antennas to mitigate common mode current, which induces noise and interferes with signal quality. Common mode chokes, formed by winding feedline through ferrite cores, block unwanted current effectively. Proper selection of core material and winding turns ensures resonance near the operating frequency, reducing interference. Isolation transformers further minimize interference, crucial for multi-transmitter stations. (01/01/1970 : 01:00)
Dernière mise à jour : 28/03/2024 : 11:36 |
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DX Cluster |
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FM1HN HAM RADIO MARTINIQUE .
Rafraîchissement Automatique dans 60 secondes.
MERCI A TOUS
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