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Build a space efficient trapped dipole antenna for 40-80-160 meter bands using RG-58 and PVC pipe. The document provides a brief guide on building a compact dipole antenna appropriate for the 40, 80, and 160-meter amateur radio bands. It explains the materials, building processes, and tuning methods required to provide best performance while preserving space. The paper also discusses theoretical elements of dipole antennas, such as impedance matching and feedline selection.

MMTTY V1.70K, released June 4, 2017, provides a full 3.5MB installation for RTTY operations on Windows platforms including XP, Vista, and Win7. The software, developed by JE3HHT, utilizes a soundcard for RTTY decoding and encoding, with support for external FSK keying via parallel or serial ports, including USB serial adapters. An MMTTY Engine V1.70K is also available, specifically designed for integration into other commercial amateur radio programs requiring RTTY functionality. Older versions such as MMTTY V1.68A (September 29, 2010) and MMTTY V1.66G are accessible, alongside a non-installer version (MMTTY168A-i.zip) for experienced users. The resource includes an updated ARRL.DX file for callsign lookup and offers a comprehensive 18MB PDF help file for offline viewing or download. Support for the software is directed to a group.io community. MMTTY integrates with **COMFSK** and **EXTFSK/EXTFSK64** for precise FSK keying, enabling direct radio control. The site also hosts MMJARTS V1.03, a 254KB utility released September 6, 2002, which generates log and summary sheets specifically for the JARTS RTTY contest, linking to the official JARTS website for contest information.

Home made vertical antenna for 80 40 15 10 meters ARRL PDF file taken from QST June 1978

Free downloadable band plans layouts ready to print in pdf format by C.Gustave Sandberg W1CGS, band plans are updated to 2007.

A reduced-size 80-meter antenna designed for small lots, portable use, and a fine companion for QRP

PDF file by QRP Expressions by By N. T. Len Carlson, K4IWL

A comparison of different multi-band dipole techniques

PDF file with plans to build an eh antenna for 10 meters band, by lloyd butler VK5BR

How to Build a Dual-Band Antenna for 2M/70cm presentation PDF file

Cannot find the inductors you need for an antenna, a tuner or amplifier ? Build your own it is easy!

PDF files describing how to homebrew a 1:2.5 balun

The RXO Unitenna, a vertical wideband antenna, offers operation across the 7-21 MHz spectrum, covering the 40, 30, 20, 17, and 15-meter amateur bands. This design focuses on achieving a low SWR across a broad frequency range, making it suitable for general HF operation without requiring an external antenna tuner for minor SWR variations. The antenna utilizes a unique loading coil and matching network to maintain efficient radiation characteristics across its operational bandwidth. Construction details within the PDF document include specific dimensions for the radiating element and the counterpoise system, which is critical for vertical antenna performance. The design incorporates readily available materials, simplifying the build process for radio amateurs. Performance graphs illustrate the SWR characteristics across the 7 MHz to 21 MHz range, demonstrating the antenna's wideband capabilities. The document also provides guidance on feedline connection and grounding considerations for optimal field deployment. This vertical antenna configuration is particularly useful for hams with limited space, offering a compact footprint compared to horizontal wire antennas.

Suggestions on finding RF ground when you live in an apartment and you want to setup an antenna

A short but efficient dipole for 40 meters band

Which balun to use? The hybrid balun promises advantages over both voltage and current baluns by ZS1AN

Determining the actual need for an antenna tuner often hinges on the specific antenna and feed line configuration in use. While many hams believe a tuner is always essential, its primary role is to present a 50-ohm impedance to the transceiver, not to "tune" the antenna itself. For instance, a resonant dipole fed with _coaxial cable_ at its design frequency typically requires no tuner, as the feed line impedance closely matches the radio's output. However, operating a non-resonant antenna, or using a resonant antenna on multiple bands, frequently necessitates a tuner to manage high Standing Wave Ratio (SWR) on the feed line. The article clarifies that a tuner placed at the transceiver only matches the radio to the feed line, not the antenna to the feed line. For maximum efficiency with a non-resonant antenna, an _automatic antenna tuner_ (ATU) or a remote tuner placed at the antenna feed point is often more effective, minimizing losses in the feed line. The discussion also touches on the practical implications of SWR, noting that modern transceivers often fold back power at high SWR, making a tuner a practical necessity to achieve full output power, even if the antenna itself is not perfectly matched.

A new, revolutionary design allows the construction of small HF antennas, which provide the same efficiency as large antennas. This antenna can be built for all HF bands, from 10 to 80 m.

Usage and benefits of transmatch. A pdf document from a QST article made available for novices and beginners by ARRL

A 27 pages pdf file revealing secrets of the cobwebb or cobweb multiband antenna with many pictures and assembling details. A great document that can guide you in making your own cobweb aerial.

Lot's of FT 897 and FT 857 modifications in a single PDF file

A new perspective on the analysis and design of this popular antenna element. By Karl-Otto Muller, DG1MFT

An inexpensive external GPS antenna, for 1.5 GHz band for GPS receiver, If you operate APRS or just need an external antenna for your GPS receiver, here's one that is easy to build yet offers surprisingly good performance in a compact size. Best of all, it uses commonly available components and materials.

A 20 and 40 meter vertical on Autopilot by K6MHE PDF File

What is a dipole antenna and why are they so popular ? Arrl PDF file

A 6 Mb PDF file of CQ Zones and ITU Zones and prefixes made available to download by Icom America.

Baluns what do they do, in a pdf file by W7EL

Download this color US ham radio band-plan in PDF format edited by ARRL

This is a combination center and top loaded multiband antenna by Mark D. Lowell, N1LO PDF File

A few hours of fun with PVC and wire and you have got yourself a respectable road radiator. The antenna consists of little more than some PVC pipe topped by a RadioShack replacement whip antenna and a couple of coils made from a small roll of #14 house wire.

EasyPal is a sophisticated digital Slow-Scan Television (SSTV) application that utilizes soundcard technology to encode and decode SSTV signals. Developed by the late Erik Sundstrup (VK4AES SK), this software has evolved into a versatile communication tool for amateur radio operators, extending beyond basic image transmission capabilities. EasyPal implements Digital Radio Mondiale (DRM) encoding technology, enabling efficient data transmission over narrow 2.5 KHz channels on both HF and VHF frequencies with remarkable speed. The application supports multiple file formats, including jpg, pdf, txt, doc, and xls, as well as specialized forms such as ICS-213 and ICS-213 (ARES). Additionally, EasyPal offers email functionality through designated repeater stations with internet access. Its responsive development history and robust feature set have established it as a premier digital SSTV solution in the amateur radio community, though users of Windows 11 should note specific configuration requirements to ensure optimal performance.

Also known as the Backpacker's Delight Antenna. This Folding J Pole Antenna is the original design of Mike Heiler KA0ZLG and was featured on the Front Cover of the March 2005 QST Magazine.

ARRL WAS Map, Map of USA call districts by ARRL and edited by AA70A

This transverter was built in 1994, a discription in three parts (german language) for DOWNLOAD as PDF-files. Circuit, printed-boards and layouts in the files

A modern version of the classic regenrative receiver designed and built by Charles Kitchin ARRL Article

This PDF File desscribes how to homemade a multi-band end-fed trapped wire antenna resonating on the low bands of 160 80 and 40 meters. Contains trap design instructions and some construction tips.

A 10-meter J-Pole antenna, detailed in QST February 1950, offers a straightforward solution for hams operating with restricted space. This design, originally presented by W1BLR, is a **half-wave radiator** fed by a quarter-wave matching stub, providing a low-angle radiation pattern beneficial for DX. The article describes building the antenna from readily available materials like copper pipe, emphasizing its simplicity and effectiveness for **single-band operation**. The J-Pole's inherent design provides a good impedance match to 50-ohm coaxial cable without the need for an external tuner, a significant advantage for portable or minimalist stations. Its nondirectional pattern ensures coverage in all directions, making it a versatile choice for general operating on the 28 MHz band. The construction plans are clear, allowing even those with basic workshop skills to assemble a functional antenna.

A PDF file containing the US grid square map provided by Icom america.

The document is a PDF detailing the construction of the DBJ-1 VHF-UHF Dual Band J-Pole antenna for amateur radio use. It provides instructions on how to build a high-performance dual band base antenna for VHF and UHF bands using a single feed line for less than $10.

Excellent guide to using ferrite cores for interference suppression. Understanding and Solving RF Interference and Noise Problems by Jim Brown K9YC Audio Systems Group, Inc. PDF File

Design your own quadrifilar helix, the site even generates a drilling pattern in a PDF file. Several different construction methods are shown.

WA5FRF VHF mobile antenna for bicycle installation

A 20 meter quarter wave vertical antenna by jerry sevick W2FMI QST Article

The radio spectrum in usa, PDF File representing the united stares frequency allocations in graphical mode, dated 2003

Building guide for a two element quad antenna planned for 28 and 21 Megahertz

W3FF article about the buddistick portable vertical antenna in a PDF file

Download the PDF with USA Amateur radio HF band plan and common country prefixes updated in 2008 by Icom

Also known as G5RV junior the half size G5RV feature reduced dimension and multiband coverage

The W3DZZ trap dipole is a versatile and economical antenna option for amateur radio operators looking to work multiple bands without the need for extensive equipment. This antenna design utilizes traps to allow operation on various HF bands, making it suitable for both casual operators and serious DXers. Its construction is straightforward, making it accessible for beginners while still providing excellent performance for seasoned hams. Constructed with readily available materials, the W3DZZ trap dipole can be built to fit specific band requirements, allowing operators to optimize their setup for the frequencies they intend to use. The design is particularly favored for its ability to maintain a low profile while delivering effective radiation patterns. Whether you're contesting or chasing DX, this antenna can enhance your station's capabilities without breaking the bank.

a portable 2 elements tri band yagi

G8ODE 160 m Top Band Inverted L Antenna made of 33m horizontal wire in the garden