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The Upside-Down Umbrella Antenna by Don Keith N4KC

New User Tips for VHF-UHF Operation by Dave Schultheis WB6KHP

The ZS6BKW wire antenna, a variant of the G5RV, utilizes a specific 13m (42.6 ft) length of 450-ohm window line as its matching section, feeding a 28.5m (93.5 ft) flat-top element. This design aims for lower SWR on 40m, 20m, 17m, 12m, and 10m compared to a standard G5RV, often achieving SWR values below 1.5:1 on these bands without an antenna tuner. The feedpoint impedance transformation provided by the window line allows for direct connection to 50-ohm coax on multiple bands. F4FHH's experience involved constructing the ZS6BKW and evaluating its performance against an _OCF dipole_ (Off-Center Fed) on various HF frequencies. The article includes observations on SWR readings and operational effectiveness, highlighting the ZS6BKW's suitability for multi-band operation. The antenna's overall length, including the flat-top and window line, is approximately **41.5 meters** (136 feet), making it a significant wire antenna for fixed station use. Comparative analysis with the OCF dipole provided practical insights into the ZS6BKW's advantages and limitations, particularly concerning bandwidth and tuner requirements.

A free application that searches more than 100 web-accessible sources to locate QSL information for a callsign that you enter once

Schematic Manual of the 3 element Yagi antenna by ECO antenne

Icom IC-9100 on youtube

Professional Two Way Radio communication by ICOM.

A Windows freeware DX cluster client, allows you to monitor DX spots from users worldwide includes DX filtering and statical functions.

Working with SDR#, adjusting frequency correction and basic setup.

VHF quad antenna for transmitter hunting.

K6ZB Bruce presentation of technologies to allow ham radio operate via internet

An home made trapped dipole antenna for 40 and 60 meters band by 2E0HTS

KB1GW's collection of beverage antenna information

yaesu radios community talk, impressions and comments about yaesu vx7r

Wholesale distributor of CB radios, parts, antennas, microphones, power supplies, crystals, echo boards, expanders, meters and CB accessories.

CB radios, mobile phones and scanners

Antenna switch at K6XX

A basic article on end-fed antennas by KB6NU

Learn a little bit about how duplexers work and building your own.

A project to build a cross band repeater using a pair of Baofeng UV5R handheld transceivers.

Tower and antenna rotation equipment, insulators, rotor control cables, ancillary products

It's a whole new way of preparing for the government FCC License examination. The classroom is your home.

Build the Moorabbin, a regenerative receiver for the AM broadcast band by Peter Parker VK3YE

Compiling an extensive collection of technical information, the Repeater Builder's website serves as a critical resource for those involved in amateur and commercial repeater systems. It covers a broad spectrum of topics essential for the design, construction, and ongoing maintenance of these vital communication hubs, drawing from years of practical experience in the field. The site provides detailed insights into various aspects of repeater technology, including specific information on VHF and UHF bands, such as 2-meter systems. Users can find data related to repeater logic, control systems, and interfacing with other radio infrastructure, all presented with a focus on practical application. Authored by Kevin Custer, W3KKC, the content reflects a deep understanding of repeater operations and engineering, offering guidance that extends beyond basic setup to advanced troubleshooting and optimization.

A small magnetic loop ready for a hand held walk and talk operation by PY1AHD

This article describes how to use a phone line as a shortwave receiving antenna, but be carefull telephone lines present a potential shock hazard, use at your own risk

Satellite Tracking and Orbit Propagation, Reports and Mission Planning Products, Pass Scheduling and Orbit Event Analysis, Dynamic Communications Link Modeling, 3-D Visualization of Complex Scenarios User Defined Regions and Contours, Constellation and Formation Flying Support, Global Positioning System Coverage

Police and Security Broadcasts at Harvard University, Boston-Area University Police Radio. Cambridge; Boston.

The no counterpoise antenna

Premier OEM of portable tower systems, Communication-Site-on-Wheels (COWs), heavy-duty fixed foundation telescopic structures commercial and military, worldwide sales and leasing

EME operation news, typical moonbounce audio recordings

Multiband no trap no gap antenna. This Antenna is a small wonder, easy to build and allow you to work all HF spectrum with your TRX and it's internal ATU.

Homebrew a 1/4 wave 80 meter vertical using aluminium tubing

A 10 Bands mobile antenna for about the price of 2 mobile monobanders.

SDR# (read SDR Sharp) is a high performance Software Defined Radio application. SDR sharp is a fully featured SDR capable of handling samplerates from kHz level soundcards up to multi hundred MHz dedicated samplers, thanks to its multi-core architecture.

How to build a beacon keyer for 28 MHz using an old CB Radio transceiver, by Tom Sevart

Unsing FT-950 in contests by K9ZW

Add Solar-Terrestrial data to your website, by adding a simple html code to your pages by Paul L Herrman

Details and very early history of yaesu musen amateur radio equipment in australia . 1966 yaesu first trasceiver.

by Don Graham, VK6HK

A quick vertical for 160 meters portable use

This note describes a relatively small, but efficient, loop antenna initially created for portable operation. With suitable modifications, it can be adapted for fixed station use. In this age of CC&Rs, an antenna similar to this may very well be the answer to your problems. Have a look, be inspired, get out the torch / soldering iron and create your own version!

Simple, inexpensive and lots of fun! Here is an easy to make home brew antenna that can get you on the air working satellites or be built for use as a portable hand held antenna to extend the range of your HT.

The Grid Yagi (or Grid Quad) is a high performance yagi antenna that can be built with readily obtainable inexpensive materials. Described here is a 6 element 2 meter version with a boom length of about 1 wavelength, shown

A compact directional receiving antenna

Includes beverage and rhombic antennas

The design of Ruthroff broadband voltage transformers

Satellite tracking for a Java-enabled mobile phone, Blackberry device, PDA.

Memory management program for the FT-60R/E FM handheld.

2 element reversible verticals, small footprint, big results.