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W0VLZ ham radio experience incuding vintage homebrew QRP operating and national radio company

Introduction to ham radio with nice selected pictures and amateur radio history by VK5SW

Article descrive the different types including coax and open-wire feeder and waveguide.

HAM ramblings from VK3TEN

Fanpage of SN7H Contest Team

Use these Variac auto transformers for specific application requirements that include, but are not limited to, home coffee roasting, tube amps, and more.

Delta Electronics, Inc. NY USA, family owned and operated selling all varieties of consumer electronics including 10 meter amateur radios, antennas, accessories, microphones, cw transmitters, coax cables and more

Amateurfunk bei DK8EY, Chris aus Mettmann im Neandertal.

Sanyo Eneloop rechargeable AA batteries. For QRP purposes, these batteries are great as a 10-cell pack

Icom-PW1 Power Supply repair and improvements

About keying speed affecting occupied bandwidth of a transmitter.

Ham radio equipment pages including Collins, National, Hallicrafters, and Hammerlund radios.

VK3RGU 438.375 MHz Gippsland Repeater in Australia

Sell quality electronic components, equipment, and accessories. Test equipment, RF Modules, Power supplies, PCB, Stepper motors.

An extensive document about Morse Code in amateur radio edited by W5ALT

Picture and specifications of the ICOM IC-2100H Amateur radio VHF transceiver at RigPix.com

This caution applies to all Icom HF transceivers. Based on a discussion with Matt Erickson, KK5DR

Professional constructed BALUNs,UNUNs and Line Isolators for Amateur Radio.

W7ED amateur radio club

Amateur Radio - US Navy - New York City Home of the Virtual Collins Radio Museum

BU2AI and BU2AO Taipei City, Taiwan

Since 2011, crkits offer radio kits that you cannot find on eBay or AliExpress. Includes HT-1A 20/40m Dual Band CW Transceiver Kit, D4D DSB Transceiver Kit for Digital Mode, R3500D ARDF Receiver, CW Transceiver Kit

Grid Calculator allows you to calculate either a grid square locator or the latitude and longitude of a location. Grid Calculator can be used to calculate a Great Circle bearing and distance between two stations in statute miles, nautical miles, and kilometers.

Harris Platinum I Solid State Channel 2, and 3 TV Amplifier Modules for use, on 50 or 70 MHz

Dec 5 – 13, 2010 J6BP by Caribbean Buddies Dxpeditions.

Encode/decode On-Off audio pulses for remote control of projects

Vintage radio and scientific apparatus by john jenkins, include antique radios, Horn Loudspeakers, Vacuum Tubes, A.C. Receivers

A multi-band off centre fed dipole, designed to operate on all bands from 40m (7MHz) to 6m (50MHz). Author claims it will operate on 40, 30, 20, 17, 15, 12 and 10m without an ATU (SWR <3:1) plus 6m with an ATU.

This amplifier takes advantage of the proliferation of surplus cellular 26v RF boards

Active Receiving Antennas, designed for reception of shortwave, mediumwave and longwave signals and VHF/UHF signals

N-channel scalable coherent receiver that employs the RTL-SDR technology in order to create inexpensive multi-channel receiving systems.

A comparison of commercial 4m verticals by by Ian Hogan G6TGO

Posting notable DX contacts

NYQsl.com - Full 2-sided color cards of excellent quality. Individual designs available. Fast turnaround based in NY USA

Ultra High Efficiency Alternative Energy System Controllers

A Web forum dedicated to HF underground and in particular to Shortwave Pirate Radio Forums and Spy Numbers listenings

Yahoo discussion list for Kenwood TS-850, TS-450 and TS-690 users

TX3A Official web site of Chesterfield Islands dx pediition from Nov 23 to Dec 6, 2009.

Effects of ice an snow in a wire dipole antennas

Shortwave radio listening club in Brazil

Ham shack located in a caravan and run by solar power. This page describes VK5SW experience of converting an old, disused and rundown caravan, to a fully functional solar powered Ham Radio shack.

Coaxial cable stripping for PL-259 connectors requires precise measurements to ensure optimal RF performance and mechanical integrity. For RG-8X, the outer jacket is stripped 1/2 inch, the braid 5/16 inch, and the dielectric 1/8 inch, leaving the center conductor exposed. RG-58 preparation involves a 1/2 inch jacket strip, 1/4 inch braid strip, and 1/8 inch dielectric strip. These specific dimensions facilitate proper soldering and crimping, minimizing impedance discontinuities at the connector interface. Different coaxial cable types, such as RG-8 and RG-213, necessitate varied stripping lengths due to their construction. The _PL-259_ connector, a common UHF type, relies on these exact preparations for a secure fit and low-loss connection. Incorrect stripping can lead to high SWR, RF leakage, and mechanical failure, impacting overall station efficiency. The guide details these critical dimensions for several popular coax cables. Using a dedicated _coax stripper_ tool or precise measurements with a utility knife improves consistency.

Designs and manufactures high quality, dependable power products.

Some recent videos of the new Mid Class RTX by ICOM, the IC-7610 HF+50MHz amateur radio transceiver.

K3WWP QSLing page. QSLing information and resources.

A document describing the reparing and restoration of an old Heathkit SB-101 power amplifier

A 0-30 MHz step attenuator, constructed from switchable Pi attenuation pads, provides a practical tool for evaluating receiver sensitivity and calibrating S-meters. The design utilizes readily available 5% tolerance resistors, with values derived from paralleled components to achieve specific attenuation steps. A schematic (Fig 1) illustrates the circuit, including PCB pad shielding, while a table details required and actual resistor values, along with percentage differences. Measurements of voltage input versus output at various frequencies are used to calculate dB attenuation, presented in a graph (Fig 4). The resource includes formulas for determining output voltage from a known input and a comprehensive 0-40 dB voltage multiplier table, which is crucial for precise signal level management. The project also references external attenuator calculators and equations for further study. Photos (1-3) provide visual guidance for the assembled unit, showing bottom, top, and front views. The project emphasizes the use of **Pi attenuation pads** and **receiver sensitivity** evaluation, offering a hands-on approach to RF signal management.

Key details about the superhet or superheterodyne radio reeiver: basic overview; how it works; applications; design notes, all you need to know.

Middle Georgia USA contesting station. Consistent record holder in 160 meter and 40 meter contests.

This project is a 40 meter to 6 meter CW "no tune" transverter using ten 2N2222 transistors and one 2N2907. The transverter requires 2 watts of drive from a 40 meter cw transceiver and outputs 2 watts on 6 meters.