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LNA Technology High Performance Low Noise Preamplifiers for Amateur Radio, VHF-UHF weak signal, DX, EME, and commercial applications.

Gamma match antenna is an antenna 1/2 additional lambda with the impedance matching more flexible arrangements (var capacitor) by sliding through the gamma match/road.

Demonstrates the design and construction of a 9-element Yagi antenna for the **70 cm band** (432 MHz), based on the DK7ZB concept. The resource details EZNEC+ calculations for a single antenna, providing gain, sidelobe suppression, and front-to-back ratio figures. It also presents a comprehensive analysis of stacking two such antennas, including optimal stacking distance (1000 mm) and the resulting performance enhancements for the stacked array, such as an increased gain of 17.03 dBi. The article includes detailed drawings, wire file dimensions in millimeters, and azimuth/elevation plots for both single and stacked configurations. Practical construction steps are documented with original photographs, illustrating element mounting, the **28 Ohm matching system** using two quarter-wave 75 Ohm transmission lines, and the critical N-connector wiring. It also covers the iterative process of fine-tuning the driven element length to achieve a return loss of 20 dB, validating the EZNEC+ simulation results with actual measurements.

Choosing the right antenna for you, by Lewis G. McCoy W1ICP

Here is a way to ease assembly and balancing of a large antenna. The elements and boom are assembled separately in most cases. Once they are all together set up 2 tripods in the assembly area and put the boom on them.

by Lou Blasco VK3ALB

Simple, easy to build, low cost, compact, multiband By Robert Wilson, AL7KK

A 2,4 GHz 13cm band quadrible qiad antenna with reflector offering a 14dbd gain

Coaxial cables attenuation chart

HX-B5i five band HexBeam installation

Comparison of several UHF antennas by DF9CY

The DL6WU yagi antenna for 23cm band

Sigmira is a free Software Defined Radio (SDR) application program that runs on Windows and Linux. It operates with with an external conventional receiver, RFSpace SDR-IQ, RPSpace SDR-14, or SDR-RADIO.com networked receiver

An easy method for erecting antenna masts using readily available material

A 11 pages pdf file about monoband or multiband end fed half wave vertical antenna that is great for DX and very cheap to build by Steve G0KYA

About HF Wire Antennas for field day or any day a basic wire antenna article

Various publications through the years have shown how the SWR measured on a shorted (or open) feed line can be used to calculate feed line attenuation

A vertical portable antenna system by W0SJS that will work on 40, 30, 20, 17 and 15 meters

The WT0G crazy W dipole, a solution for 160 meter operations

If you want to build a repeater, this is the right place to start. Includes construction projects and reviews of repeater hardware available in the market.

A very short dipole with a good radiation efficiently plus a respectable bandwidth by S. C. Chuck Smith, WA7RAI

A Simple Serial and Sound-Card Interface for the Yaesu FT-857D

A brick, some PVC tubing and a few other common hardware store items can be transformed into an effective Quick and Dirty RF-launcher for less than $25! By Michael Atlas, N7FC

With over 20 years of experience, Proyecto 4 operates as a specialized ham radio retailer in Madrid, Spain, providing a diverse inventory of transceivers, antennas, and related accessories. The store features popular models like the _ICOM IC-705_ and _ICOM IC-7300MK2_, alongside Yaesu transceivers such as the _FTX-1 Optima_, which delivers 100W on HF and 50W on V/UHF bands. The product range includes mobile and portable antennas, such as the D-Original DX-NR770HB, offering 3 dB gain on 144 MHz and 5.5 dB on 430 MHz, and the Diamond RH-770 with a BNC connector. CB radio enthusiasts can find the Anytone CB SMART II AM/FM transceptor and the Telecom LS145 mobile antenna, rated for 500W and 4 dB gain on 26-30 MHz. Proyecto 4 emphasizes its in-house technical service, inviting customers to visit their laboratory for repairs and technical consultations via sergio@proyecto4.com. The store also highlights customer reviews and offers promotions like Yaesu Cashback, providing savings up to 100€.

Scans of original G2DAF articles on his HF linear amplifier using QY3-125 tube

CTCSS Decoder and Encoder, DTMF Decoder projects

Radio, cb, pmr446, Paris France

The TS850s connector pinouts for Mic,acc2, acc1 and remote connector

A short good performing antenna for 70cm

Christoph petermann's df9cy six element yagi antenna for six meter band

By Alfred T Yerger II WA2EHI, in this PDF file explain how to remote your rig via the internet by using HRD Ham Radio Deluxe and skype

Leading supplier of low and high frequency electronic filter design products for the design of wireless telecommunications equipment, semiconductors and more

Take the mystery and mystique out of standing wave ratio. QST Article by K5DVW

Radio communication equipment installation recommendations

Homebrew a cobwebb antenna for the HF bands. This page describe a cobwebb multiband antenna resonating on 14 18 21 24 and 28 MHz. The cobweb antenna model can be considered a fan dipole, or better, multiple dipoles fed in parallel.

Inverted Vee antenna for 40m with simulation data by DF9CY

Collection of different techniques to homebrew PVC yagi antennas, including elements assembling, baluns and chokes, radiator box tips and tricks by dk7zb

This manual provides the technical necessary for servicing the VX-6R Yaesu Transceiver

A perfect companion for your Elecraft K1 or any other (not power hungry...) QRP rig

DF9CY experience on a vertical antenna for 40 meter band

Theory of horizontal loop antennas, as discovered by G2PL using a lowered quad antenna and theorized by ZS6AKA

ARRL Lab notes, article by WB8IMY on helping choosing the best transceiver for your needs.

The simple and safe RS232 CAT interface for Yaesu FT-1000MP, FT-1000MP Mark V and FT-1000MP Mark V Field rigs

2,6 and 10 meters beacon located at Lake White, Ohio

Does your Amateur Radio system comply to the EMI rules ? (German values implemented)

IC820H or other Icom Radios Soundcard interface for VHF EME use by DF9CY

By Jim Davey WA8NLC

Original Tuna-Tin 2 QRP CW transceiver article by W1CER