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T97M WEB Page dedicated to DXpedition to Cyprus and Kuwait November 1997.

KK5DR review of the IC-7700 HF ICOM Transceiver

This page only applies to TH D7A's that have a S/N below 010xxxxx and have not had their firmware upgraded by a Kenwood Service Center.

The web pages of VU2PTT, Prasad Rajagopal, also AT2PTT, AT0PTT. Information on ham radio operations, Contest log book searches

Amateur Radio: Links to Lots

The first Kuwaiti contest club,idea of 9K2RR

Organizers for 9k 15-m contest

WEB site of UT5UGR Dimitry

Official Yaesu FT-920 Specifications and options

Such kind of omnidirectional antenna gives the possibility to be QRV with horizontal polarisation, as commonly used for the CW and SSB section of the 2m band. This actual design shows a 1.3:1 bandwidth of about 150kHz, centered to 144.200MHz.

The requested resource, identified by the title "Micamold XTR" and description referencing the _Micamold XTR-1_ transmitter manufactured in 1948 by MICAMOLD Radio Corp., is currently unavailable, returning a 404 error. This indicates the specific content detailing the vintage radio equipment, its technical specifications, or historical context is not present at the given URL. The original intent was likely to provide information on this particular piece of antique radio gear, potentially covering its design, operation, or restoration aspects relevant to collectors and enthusiasts of historical amateur radio equipment. The absence of the page means no technical details, schematics, or operational insights regarding the _XTR-1_ transmitter can be retrieved. Users seeking information on this specific "boat anchor" radio would need to pursue alternative sources or attempt to contact the original website owner directly, as suggested by the QSL.net error message. The QSL.net platform, which hosts over 30,000 individual amateur radio websites, provides free services but does not maintain the content of individual hosted pages.

Morse code speedometer project using the 16F84 PIC

I live in Vnukova, Russia near Moscow.

A 70cm ground plane antenna made with a 90cm of 1mm silver steel rod

The LU2EE Radio Club Tandil maintains a minimal web presence, primarily serving as a directory listing under the `qsl.net` domain. The resource itself offers no direct content, instead presenting an "Index of /l/lu2ee" page with a link to the "Parent Directory." This structure suggests a placeholder or an outdated web address rather than an active information hub, providing only the club's callsign and location. Without specific content, the resource does not offer technical details, operational results, or practical applications. It functions solely as a basic identifier for the _LU2EE_ club in _Tandil_, Argentina, without further elaboration on activities, membership, or technical contributions to the amateur radio community.

TI0RHU Radio Club Heredia Costa Rica with ROMEO HOTEL, DX group.

Intermediate licence amateur radio station located in Sydney Australia

137 kHz propagation analysis details ground wave and sky wave mechanisms, drawing heavily from **CCIR Rec. 368-6** for ground wave field strength predictions and **CCIR Rep. 265-7** for sky wave modeling. The resource presents field strength values for 1 W ERP at varying distances, considering ground conductivity and permittivity for ground wave, and ionospheric height (70km daytime, 90km nighttime) for sky wave. Key factors like ionospheric focusing (factor "D"), reflection coefficient ("RC"), and antenna ground pattern factors ("Ft", "Fr") are quantified for 137 kHz, enabling calculation of sky wave field strength. Practical coverage ranges are derived for 137 kHz, showing useful ground wave coverage up to 1600 km over seawater and 1100 km over average ground, assuming a -9 dBuV/m noise floor. Sky wave coverage extends beyond 2200 km during night-time and winter daytime, but is negligible during summer daytime at solar minimum. The document also compares ground wave and sky wave strengths, identifying crossover distances at 550 km (night-time), 750 km (winter daytime), and 1250 km (summer daytime), where interference fading can occur. Adjustments for solar maximum conditions are provided, indicating 2-11 dB higher sky wave values depending on distance and season.

1998 Maldived DXPedition by IK5MDF log search and stats

2-Element-12,5-Ohm-Yagi with 0,40m-Boom complete description of all details for building this Yagi and stacking to an array

Autonetics radio club - k6nx - boeing, anaheim

Influence of the ionosphere on the EME signals by EAVQ

Information about Venezuela, frequencies, maps, photos, history, and related links

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.

VK3BFC HamWeb with links, interactive information and much more

This program combines the formerly know programs PreFind and MU-Locator into one but with many improvements to find the location of any prefix, country or Maidenhead locator! Display and find locators on any map and calculate the distance and direction between two locators.

This is the home page of the Brazilian ham radio PY1WAS, Alex. Essa a home page do radioamador brasileiro PY1WAS, Alex.

Radio Club Venezolano

This Power meter is capable of dissipating up to 100 watts for a short period and 20 watts continuously

A page dedicated to the Heathkit GR-81 Regenerative Receiver

My logbook, my test on X7 CushCraft Antenna, enjoy CW and more

The Chattooga - Walker amateur radio club

CB radio club in El Progreso, Yoro, Honduras.

K8qik amateur radio club

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.

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

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

WA1ION article on beverage and ewe antennas

K9EID 75W power amplifier for the six meters

The construction principles for open-sleeve elements in antennas

Aqui encontraras todo lo relacionado con la radioaficion de Puerto Rico

Original article was in December, 1986 QST

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

Lewis County, New York

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.

Radio Society of Sri Lanka