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Transmitter power limits and frequencies allocation by band

A simple T-network that can match any unbalanced antenna system by AA5TB

Amateur quarter wave ground plane antenna calculator, calculate vertical and radial length

MoxGen will show you the dimensions and generate an antenna model file for a 50 ohm Moxon Rectangle antenna, given the design frequency and wire size

The terminated tilted, folded dipole T2FD is a little known antenna that performs excellently. Compact in size compared to a half-wave dipole the T2FD provides signal gain, wide frequency coverage, and exceptionally low noise characteristics.

Constructing a high-power solid-state amplifier for HF operations presents unique challenges, particularly when aiming for significant output like 600 watts. This project details an amplifier design employing **Motorola MRF150** FETs, a common choice for their robust performance in RF power applications. The design emphasizes achieving substantial power output, a critical factor for effective DXing and contesting, where every decibel can make a difference in signal propagation and readability. While specific circuit diagrams or construction details are not directly presented on the current page, the mention of MRF150 FETs points towards a design that would typically involve push-pull configurations, impedance matching networks, and robust power supply considerations to handle the high current demands. Such amplifiers are often built with an eye towards linearity and efficiency across the HF bands. Amateurs pursuing similar high-power solid-state projects often share insights on thermal management, intermodulation distortion, and component sourcing, all vital for a stable and reliable amplifier capable of delivering 600 watts into a proper antenna system.

Using Hi-Fi Audio with FT-1000. Includes many FT-1000D modifications too by K6JRF

Icom PCR 1000 at NASA Marshall Space Flight Center monitoring meteor signals on 67.3 mhz.live.

Use plain water with a little salt added to build your own Dummy Load

What type of antenna should I get? Well, the best type of antenna for working the OSCAR satellites are circular polarized antennas

A 40m through 17m Mini End Fed Half Wave Antenna Coupler by Steve Yates - AA5TB

The homemade CW paddle key design, inspired by a QRP homepage, utilizes soldered PC board material for its construction. The builder, DL5NEJ, modified an existing design to achieve a smaller footprint, preferring a compact setup for portable operations. This paddle was specifically built to complement a Wilderness Radio SST20 QRP transceiver kit, demonstrating its suitability for low-power operations. The project details suggest a straightforward assembly process, with the primary components being readily available PC board scraps. The design emphasizes simplicity and functionality, aiming to provide a reliable keying experience comparable to commercial paddles like the Bencher. Performance evaluations indicated the simple paddle operates effectively, prompting further exploration into similarly minimalist QRP rig designs. Additional construction details for a similar paddle are available from PA0CMU.

Wire antennas requires a special coupling network to properly couple my 50 ohm coax to the antenna's high impedance (5000 ohms)

Servicing radios made in the 1930's, 40's and 50's. Speaker reconing for vintage and modern speakers.

Exaustive introduction to radio wave propagation, includes a very detailed glossary on common propagation terms, composed by AE4TM.

The programming cable is intended to be used with a computer RS-232 port for programming radios and other devices.

by Tony I0JX

JA7KPI windom antenna page

G0KYA slim jim antenna for 10 meters band

This antenna project came out very nice. It's a rugged homebrew multi-band trap vertical antenna that works the 10, 15, and 20 meter amateur radio bands. The antenna can be mounted on the ground or on a mast. Mounted on the ground the antenna has a low take off angle for working DX. If mounted on a mast the antenna will acheive both a low angle as well as another radiation lobe that has a much higher take off angle.

Inverted V antennas is a dipole with the center raised on a mast and the endpoints near ground. Calculate dimensions online.

8 and 4 elemets yagi beam antenna by N6CA

SWR and RF power meter for home usage, 8 different RF probes with different characteristics and power ranges by OK1DX

Adding an external antenna to the Belkin F5D7050

DXSpotter is a commercial Win32 HAM radio application for working with DX Clusters by using TCP/IP protocol for communications. It is adapted to satisfy most DXer's needs. DXSpotter includes 2 programs in one: DXSpotter for connections via telnet protocol to more than 200 DX Clusters, and DXSpotter-Summit for connections to OH2AQ's WEB cluster DXSummit page with automatic page refresh Price USD 25

VE3HCR article of a home made loop antenna for 80 meters band

ADE Filter Design and analysis is a free for download windows program to design filters

Coaxial cable loss in db per 100 ft.

Fold, bend, and mutilate or kaking a dipole fit the space available

Yaesu FT 101 unofficial web site managed by NW2M

RFI/EMI RadioFrequency interference/electromagnetic interference by ARRL Technical Information Service page

Lincomatic's Homebrew WiFi Antennae, Cantenna, Toothpick Monopole, Patch Antenna, BiQuad, collinear wifi antenna all in one page

IK4DCS experience on maintaining a multiband delta loop antenna for 10/12/20 meters.

Yaesu CAT Cable for FT-817 857 897

This meter scale drawing program is designed to have a computer do the hard work in making a precision scale for a d'Arsonval analog meter. The resulting scales will typically be nicer-looking than those found on many commercial meters.

Also known as W0MHS Loop Skywire or Full Wave Loop Antenna, here you can find N1SU interesting observations on this antennas.

Forum thread about possibility to extend VX-6R to freeband and 6 meters

This article describes how to make a quadrifilar helix (QFH) antenna easily, from inexpensive materials: uPVC plumbing pipe and RG-58U co-axial cable

Ham radio blank log sheets to log your contacts

An introduction to portable shortwave receivers and sw radio. What to look for in a good portable. Reviews of Sangean ATS505. Band info and frequecies.

Easy for calculate formula which could be a wake-up call for you. The SWR value at the input of antenna cable is not a actual SWR of your favorite antenna.

Low-cost 600:50 Ohm Baluns by Andrew Corney ZL2BBJ

Web site updated several times per month. It covers all aspects of ham radio.

A vertical monoband that's small, light and portable, needs no counterpoise and performs as well as a home antenna

A Moxon rectangle antenna projects for the 6 10 15 17 and 20 meter band but include drawings, plans, statistics and homebrewing statistics.

An interesting article on traps, pros and cons of trapping by W4RNL

A shorten Dual-Band Dipole with overall length of about 11 m. For this antenna traps are substituted by inductors, in order to cover the 10 & 40 m. Bands.

The Ohio/Penn DX Bulletin is freely distributed on the Internet and packet clusters around the world, by Tedd Mirgliotta, KB8NW. Published almost on weehly basis the OPDX is one of the oldest DX news list on the internet.

Common faults, and modifications for the kenwood TS-430 S

Fatpigdog's Real Time FFT Audio Spectrum Analyzer. User interface has the look and Feel of an HP Spectrum Analyzer. But, in addition to the regular Spectrum Plot, it also produces detailed Waterfall plots. The user can optimize the color map, chosing from a wide assortment of color themes. This analyzer supports multiple traces, trace arithmetic and normalization.