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HF Propagation


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Friends News - 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 2320  View ?

Countries with CEPT Licence, BG2FX Amateur Radios, JBOT QRP linear amplifier, RF Inductor Calculator, DCF77 , JJY, 9X5RU Rwanda,
(01/01/1970 @ 01:00)
Top Amateur Radio Websites - Issue 2319  View ?

HF DXView Propagation Map, HF EFHW Antenna Antenna Tuner, A Morse Code Practice Oscillator, URE WebCluster, MSF radio time signal, Morse Code Practice Oscillator, CW Key-to-Rig Switch Box,
(01/01/1970 @ 01:00)
Icom Announce ID-50 Compact Digital Dual Bander  View ?

The ID-50 is a compact VHF/UHF dual bander with both D-STAR and FM dual modes. Connecting to the D-STAR network, you can call a friend in another city, or other regions around the world with the ID-50. Smart functions such as Band Scope and Picture Sharing function enhance your QSO experience.
(01/01/1970 @ 01:00)
Top Amateur Radio Websites - Issue 2318  View ?

28 MHz Antenna Project, K1FM Mini Magnetic Loop, Portable 40m CW Transceiver , AircraftScatterSharp, 3B7M St Brandon DXPedition, HD8M Galapagos,
(01/01/1970 @ 01:00)
Top Amateur Radio Websites - Issue 2317  View ?

20 W HF Power Amplifier, Tri-Band VHF/UHF Antenna Design, Building The Fox-in-a-Box, Aircraft Scatter ACS, Airplane scattering, Taking a look at the 900 MHz band, Thevenin equivalent calculator,
(01/01/1970 @ 01:00)
ICOM IC-R20  View ?

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)
FT-817 internal battery power Fix  View ?

Radio Equipment/HF Transceivers/Yaesu FT-817
If your FT-817 has stopped powering up from the internal battery but works from external power, then maybe the internal battery fuse has blown. There is a small PCB mounted fuse to protect the battery and radio. This fuse can blow, if it does your radio will not work from battery power. This page will describe how to test the fuse and describe how to make a repair.

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(01/01/1970 @ 01:00)
Shortened 30m Dipole  View ?

This article describes the construction of a 9,50 m long dipole for the 30 m band (10.1 MHz to 10.15 MHz). It was designed to be mounted ca. 6 m above ground inside an attic. The calculations were performed by OE1MEW
(01/01/1970 @ 01:00)
Mains RF Filter  View ?

Technical Reference/Radio Frequency Interference/Noise Reduction
If RF noise threatens to take your hobby away, this could be probably a good solution to reduce or even eliminate RF Noise.

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(01/01/1970 @ 01:00)
Portable Operating Tips for Ham Radios  View ?

Operating Modes/Portable Operations
This article is from the book Ham Radio For Dummies and features some tips for portable amateur radio operations, on Field Day or generic outdoor operation, like selecting the proper antenna and portable power.

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(01/01/1970 @ 01:00)
A High Performance RF Choke for the HF bands  View ?

Antennas/Feed Lines/Choke
Home brewing a high performance, high power common mode choke for HF bands
(01/01/1970 @ 01:00)
Thunderstorm connected with Sporadic E propagation  View ?

Propagation/Sporadic E
Recent researches seem to support the hypothesis that Sporadic E propagation could be connected to presence of thunderstorms.
(01/01/1970 @ 01:00)
Raspberry PI remote Ham Radio Server  View ?

Technical Reference/Raspberry Pi
Remote Ham Radio via WebRTC Audio Raspberry Pi 3. Stream Transceiver Audio to and from the remote station though a Browser using WebRTC.
(01/01/1970 @ 01:00)
High Performance Common-Mode Chokes  View ?

Antennas/Feed Lines/Choke
This article is an attempt to shed some light on this misunderstood component, covering topics like why you need a common mode coke, what it does, what properties it should have, ho to build one and how to measure its performance.

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(01/01/1970 @ 01:00)
QRZ.sh  View ?

This script queries the QRZ.com callsign database and returns the result to the command line. A XML subscription plan with QRZ.com is required for full functionality. QRZ.com callsign data query script written in Bash

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(01/01/1970 @ 01:00)
DIY Yagi Antenna  View ?

This article describes the phases for the construction of a Yagi antenna. The calculations of the parameters are made using 4NEC2 software. This type of antenna is used for transmissions and receptions of electromagnetic waves. The project shown here refers to the frequency of 433.92 MHz.

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(01/01/1970 @ 01:00)

Last import : 01/06/2023 @ 07:43

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