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HF Propagatie


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RSS lezer - The DXZone.com

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 2414  Kijk naar?

DIY EMC/RFI Mains Filter for a Clean Shack, G4WIF End Fed Half Wave Antenna , Antennas for QRP Operation, Innovative 2m to HF Converter, Exploring the Spectrum From HF to UHF Frequencies, Boondock Echo 2 way ham radio recorder, Building an Enhanced APRS IGate with Debian 12 and Raspberry Pi, CB0ZA Robinson Crusoe Isl DX Pedition,

... / ... Lees meer...

(01/01/1970 @ 01:00)
Top Amateur Radio Websites - Issue 2413  Kijk naar?

Budget-Friendly 5-Element Quad Antenna Design, Budget-Friendly QRP T-Tuner and SWR Bridge, A Guide for Seamless FT8 Operation - Time Sync, Building a Robust PL519 Tube HF Amplifier, GMA Maps, Adapting Standard Headset Mic for Yaesu FT-8900, Portable Efficiency: Building a KX3 Go-Box,
(01/01/1970 @ 01:00)
Top Amateur Radio Websites - Issue 2412  Kijk naar?

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,

... / ... Lees meer...

(01/01/1970 @ 01:00)
Top Amateur Radio Websites - Issue 2411  Kijk naar?

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  Kijk naar?

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)
ICOM IC-R20  Kijk naar?

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)
VDA Antenna for 30m  Kijk naar?

This project documents the construction and enhancement of a 30m Vertical Dipole Array (VDA) antenna inspired by Remco 7QNL article. Initial design utilized an 18m Spiderbeam pole and a 4m boom. Improvements included a lighter boom structure using fishing rods and a revised coaxial arrangement for enhanced mechanical stability.

... / ... Lees meer...

(01/01/1970 @ 01:00)
A portable 3 element 6m Yagi  Kijk naar?

Antennas/6M/6 meter Yagi Antennas
A small Yagi antenna for camper van. It is made of aluminum tubing, breaks down for storage, and works well for communicating with others. He built it in an afternoon and it gets good signal. The antenna is lightweight and can be packed up to fit inside his van while traveling

... / ... Lees meer...

(01/01/1970 @ 01:00)
QRP Cluster  Kijk naar?

DX Resources/Clusters
QRP self spotting Cluster, where every QRP broadcasting enthusiast can announce on which frequency they are working, in which mode, or with what equipment and power they are working.
(01/01/1970 @ 01:00)
QSL Card creator  Kijk naar?

This webpage allows you to create custom QSL cards (confirmation of radio contact) as PDFs for printing. You can personalize them with images and information. The cards are standard size (5.5" x 3.5") but can be adjusted slightly for easier printing on regular paper. You'll need Adobe Acrobat Reader to view the PDFs. There's also an option to create a free account to save your information for future cards.

... / ... Lees meer...

(01/01/1970 @ 01:00)
K4SWL Antenna Plus  Kijk naar?

This project details building a multi-band antenna for park activations. The author constructs a random wire antenna with a 9:1 UnUn for improved performance. Winding the toroid core proved challenging, but the completed antenna shows promising results in initial tests with an analyzer. Further field testing is planned for a future activation.

... / ... Lees meer...

(01/01/1970 @ 01:00)
Beverage Remote Switch  Kijk naar?

Technical Reference/Antenna Switch
The author describes building a remote switch box to control the direction of two reversible Beverage antennas. The switch uses a buried cable and relays to select the desired antenna direction from the shack. The design is simple and uses common components.

... / ... Lees meer...

(01/01/1970 @ 01:00)
An Overview of Beverage Receiving Antennas  Kijk naar?

This article explores Beverage antennas, a type used for low-frequency radio reception. Despite the mystique, they are relatively simple wire antennas placed near the ground. Their key benefit is improved signal-to-noise ratio by rejecting unwanted signals. While lengthier antennas offer better reception, even shorter versions (around 200 feet) can improve DX reception compared to traditional antennas.

... / ... Lees meer...

(01/01/1970 @ 01:00)
Repairing a dead Kenwood TS-850S  Kijk naar?

Radio Equipment/HF Transceivers/Kenwood TS-850
The author fixed a friend's Kenwood TS-850S radio, which suffered from Capacitor Plague, a common problem in 1990s electronics where capacitors leak and damage circuit boards. The CAR board, responsible for generating signals, was especially affected. The author cleaned the board, replaced the capacitors, and repaired a broken trace. Although the radio mostly functioned afterward, the "Slope Tune" control behaved abnormally. The cause seems to be a software issue, not a hardware one.

... / ... Lees meer...

(01/01/1970 @ 01:00)
Multi-Band End-Fed Antenna Design for Limited Space  Kijk naar?

This document details the construction of a multi-band end-fed antenna, suitable for situations with limited space for larger antennas. The design utilizes a 1:49 to 1:60 impedance transformer to match a half-wave wire antenna fed at one end. Compared to a traditional dipole, this antenna resembles a highly unbalanced Windom antenna with one very long leg and a virtual short leg. The design eliminates the need for radials but relies on the coax cable shield for grounding. The document recommends using at least 10 meters of coax and installing a common mode filter at the entry point to the shack for improved performance.

... / ... Lees meer...

(01/01/1970 @ 01:00)
Reversible 40 Meter Moxon  Kijk naar?

The author wants a compact, switchable antenna for 40-meter ham radio. They compare 3 designs: rectangle, short-tipped W6NL, and T-hat. All work well electrically, but mechanics matter for a large antenna. The rectangle needs strong support, while the T-hat is sturdier with slightly longer elements. The T-hat design wins for now, but the author will focus on its mechanical details next.

... / ... Lees meer...

(01/01/1970 @ 01:00)

Laatst import : 13/04/2024 @ 19:34

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