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K8qik amateur radio club

Yaesu ATAS 120 Autotune Antenna Repair

Countries worked on 6 meters, ZF firsts on 50 Mhz, and links to resources.

Dxpedition information site has dates, frequencies, operators etc. Planning a searchable data base for logs.

A page dedicated to the Heathkit GR-81 Regenerative Receiver

How to reduce and eliminate the RF interference at VHF caused by the wired network

Configuring the TM-D710 with Garmin Nuvi 350 for APRS setup

QSL information for AX1AA VK1AA/M VK1AA/2 VK1AA/4 VK9LX VK9LX/MM VK9LX/9 H44XX H40XX

WA1ION article on beverage and ewe antennas

Activities, legal infos, technical articles, photos, vendors, software, and links

A Linux Smith charting program. You can enter either discrete components or transmission lines, see the results on screen and/or generate Postscript output. Component values can be changed numerically or using scrollbar

The construction principles for open-sleeve elements in antennas

Aqui encontraras todo lo relacionado con la radioaficion de Puerto Rico

This circuit is very simple and has a fantastic range of potential uses.

Original article was in December, 1986 QST

K9EID 75W power amplifier for the six meters

Lewis County, New York

The ZR6YY Antenna for 6m by Maurius ZR6YY revisited by YT1VP

5 Elements 12,5 Ohm Yagi with a 6m Boom

Dx-pedition in Lebanon on July 2004 by I1HJT - I1NVU - IK1QBT - OD5LN pictures and Log on-line it's available on web site. Qsl via I1HJT

A synthesized 2.3 GHz Amateur Television (ATV) transmitter design, conceived by Ian G6TVJ, is presented, targeting broadcast-quality video performance on the 13cm band and extending up to 2.6 GHz. The core of the design utilizes a commercial Z-comm Voltage Controlled Oscillator (VCO) that tunes from 2.2-2.7 GHz, providing a +10 dBm output and simplifying RF alignment. This VCO's stability, originally intended for narrowband applications, readily accepts high-frequency video modulation, contributing to the transmitter's robust performance. The exciter stage, incorporating a Mini Circuits VNA 25 MMIC amplifier, boosts the signal to +16dBm, while a Plessey SP4982 prescaler divides the output frequency for the synthesizer. The synthesizer employs a Motorola MC145151 CMOS parallel IC, favored over the common Plessey SP5060 for its superior video modulation characteristics and ease of programming without microprocessors. This choice addresses issues like LF tilt and distorted field syncs often seen with SP5060 designs, particularly when operating through repeaters or over long distances. The MC145151 divides the signal further, enabling precise frequency stepping, with programming handled by EPROMs for channel selection and LED display. The loop filter network, critical for video integrity, was developed through experimentation to prevent the PLL from reacting to video modulation, ensuring a clean transmitted picture. The transmitter incorporates a Down East Microwave commercial power amplifier module, delivering approximately 1.6W output, driven by the exciter through a 3dB attenuator. Construction involves surface-mount SHF components on micro-strip lines etched onto double-sided fiberglass board, housed within a tinplate box. The design boasts no AC coupling in the video path, preserving low-frequency response, a common failing in other ATV transmitters. Performance tests with a 50Hz square wave revealed no LF distortion, and a calibrated "Pulse & Bar" signal showed a near 100% HF response, demonstrating its capability for high-quality ATV transmissions.

IK2PII describe here a simple direct conversion receiver, thinked for QRSS and DFCW communications, as companion of ARGO or SPECTRAN programs.

L50W-Special callsign for the 50?anniversary of LU1WP-Radio Club Trelew

Radio Society of Sri Lanka

D.I.C. Diploma Isole Campane from Italy

Comprehensive list of links related to Amateur Radio, Electronics, and other fn stuff.

Ivo presents a list of LZ Awards and Bulgarian Lighthouses

Intermittent fluctuations of SWR readings with MFJ 259B antenna analyzer.

This RF probe circuit allows RF to be measured in the presence of DC

Corona & Norco in Southern California

The Belarussian Federation of Radioamateurs and Radiosportsmen (BFRR), the member society of International Amateur Radio Union (IARU). HQ is based in Minsk city, Belarus

QJackRcd is a simple stereo recorder for Jack with few features as silence processing for automatic pause, file splitting, background file post-processing.

Design for a quarter wave vertical antenna, for the top band in use at V31YN

F2CW-ZL3CW African DXpedition Log Search Page

Fall River Amateur Radio Club

Personal page with photos and info on used equipment

This is a computer program for Amateur Radio transmission and reception using a computer and radio transceiver The program equips your computer with a one sentence at a time chat-mode for operation on the HF bands. You use it in the same way as you would Skype or cell-phone TXTing. This facilitates rapid-fire QSOs and especially makes nets easier by ZL2AFP

The official home page of the Greenland EME DXpedition 29 May - 5 June 2000

This calculator estimates the efficiency of a T match tuner using a simple loss model.

EME, MS, Tropo from the island of Corsica

List of APRS server worlwide mantained by ae5pl

If you like packet radio you will find me there.

NHRC-2 Based Repeater Controller A perfect controller for a simple repeater or link, or portable/solar powered system.

Interfacing the IC706MKIIG for Soundcard & TNC modes

Vasantha VU2VWN VFO controlled 40m Tansmitter schematics

Amateur Radio Hobbies of K4MDB

1.5 dB of matched line loss can be calculated for a given transmission line using this online tool, which employs a model calibrated from empirical data. The calculator allows radio amateurs to input specific transmission line types, such as _RG-8_ or _RG-58_, and then determine the expected signal attenuation. This is crucial for optimizing antenna system efficiency and understanding power delivery to the radiating element, especially for HF and VHF operations where feedline losses can significantly impact performance. Beyond matched loss, the calculator also provides an estimate for mismatched loss if the Standing Wave Ratio (SWR) is specified. This feature helps operators quantify the additional power loss due to impedance discontinuities between the transceiver, feedline, and antenna, which is a common concern in amateur radio installations. Accurate loss calculations are vital for effective station design and for predicting actual radiated power. The tool's utility extends to various operating scenarios, from fixed station setups to portable deployments, aiding in the selection of appropriate feedline lengths and types to minimize signal degradation. Understanding these losses is a fundamental aspect of maximizing the effectiveness of any amateur radio antenna system.

How to program Baofeng handheld transceiver with satellite frequencies, and how to get alerts when satellites are visible by using a smartphone app. A beginners guide to work satellites with a common VHF handheld radio.