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QSL information for AX1AA VK1AA/M VK1AA/2 VK1AA/4 VK9LX VK9LX/MM VK9LX/9 H44XX H40XX -
WA1ION article on beverage and ewe antennas -
2-Element-12,5-Ohm-Yagi with 0,40m-Boom complete description of all details for building this Yagi and stacking to an array -
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The construction principles for open-sleeve elements in antennas -
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. -
5 Elements 12,5 Ohm Yagi with a 6m Boom -
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How to build Fan-Dipoles by DK7ZB. Experiences with various band combinations. Not all combinations are working properly. If the frequencies are to close together the impedances will lead to a very bad SWR. This happens with the bands 10-12-15m or 15-17-20m. -
Original article was in December, 1986 QST -
Aqui encontraras todo lo relacionado con la radioaficion de Puerto Rico -
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K9EID 75W power amplifier for the six meters -
IK2PII describe here a simple direct conversion receiver, thinked for QRSS and DFCW communications, as companion of ARGO or SPECTRAN programs. -
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 -
L50W-Special callsign for the 50?anniversary of LU1WP-Radio Club Trelew -
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Activities, legal infos, technical articles, photos, vendors, software, and links -
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This RF probe circuit allows RF to be measured in the presence of DC -
Fall River Amateur Radio Club -
D.I.C. Diploma Isole Campane from Italy -
Corona & Norco in Southern California -
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 -
NHRC-2 Based Repeater Controller A perfect controller for a simple repeater or link, or portable/solar powered system. -
The official home page of the Greenland EME DXpedition 29 May - 5 June 2000 -
Personal page with photos and info on used equipment -
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Interfacing the IC706MKIIG for Soundcard & TNC modes -
Home page della Sezione ARI di Gorizia -
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LU Argentina Country CALL division Antarctic and South Atlantic prefixes and sufixes -
Bienvenue sur ma page personnel ! Welcome to my personal web pages ! -
Antennas, Transmission Lines, Tuners - Myths, Mysteries and Qualifiers By Don Wilhelm W3FPR -
If you like packet radio you will find me there. -
Home page with links ham and more -
This 6 meter 2 element yagi antenna is simple, compact and effective antenna for 50 Mhz. The design antenna was optimized with AO for best match to 50 ohms, no matching network. A choke balun is recommended to decouple feedline currents. -
Setting up a solar power system in your shack -
Dave N9EWO's view's and comments on the Vertex-Standard-Yaesu (V-S-Y) VX-2R also compared to the Icom IC-P7A -
Vasantha VU2VWN VFO controlled 40m Tansmitter schematics -
A page dedicated to the Heathkit GR-81 Regenerative Receiver -
This simple project, based on the orginal CobWebb-Antenna model, is about an horizontally polarized, omi-directional antenna for the six meter band. -
RF/Microwave Simulator for Puppy Linux by WN2A -
The Ft.McCoy Amateur Radio Club is a friendly Club located in the Ocala National Forest, Marion County Florida. The Club was founded in October 1997 -
H.E.A.R.T. Serving Pinellas County -
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CW is not just another mode like SSB, FM, PSK-31, etc. It is a unique mode that has alot of advantages. -
Known Affectionately as the "GreenbrookRepeater"! -
50MHz DX Bulletin edited by O. Bjorn Matt Madsen
