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Constructing a dip oscillator provides radio amateurs with a fundamental piece of test equipment for resonant circuit analysis. This particular design, adapted by VK3YE from a concept by _Drew Diamond VK3XU_, details a practical build using readily available components. The unit incorporates four plug-in coils, covering a frequency range from **2.6 MHz to 55 MHz**, mounted on 5-pin DIN plugs for versatility. A salvaged two-gang air dielectric variable capacitor, fitted with a vernier reduction drive, serves as the tuning mechanism, with the smaller gang optimizing bandspread at higher frequencies. In practical application, the dip oscillator is used by setting the meter needle to approximately two-thirds scale. When the instrument's coil is brought near a tuned circuit under test, a noticeable dip in the meter reading indicates resonance. This allows for precise measurement of resonant frequencies in antennas, filters, and other RF circuitry, proving invaluable for homebrewing and troubleshooting. The design emphasizes short wire runs for stable operation, particularly at the higher end of its operational range.

HamBlog is a weblog host for Amateur Radio operators.

Article describes a circuit that accelerates the coil of DC relays by momentarily doubling their voltage.

Makers of the The Polar Explorer transmitter, which operates on 9 HF bands from 160 through 10 meters and is capable of 500 watt peak output power on SSB, CW, AM, FM and RTTY. It is intended to be used in conjunction with a transceiver.

Things on the occasion of amateur radio activity only

Rack Mounts for ham radio transceivers and receivers

Ezty rope clamp manufacturer making your rope and anchor line tasks simpler. Custom made products for all your boating needs. ropes lines, rope clamps, dock lines, end tips, sleeves, sliding locks, clamps, hooks, plastic hooks, tie down kits

A member of the adventure radio group

Converting the GN9120 Wireless Bluetooth Interface for Amateur Radio

The Matanuska Amateur Radio Association (M.A.R.A.) is a general interest amateur radio club, with approximately 100 members, our members are involved in every aspect of amateur radio.

QTH.COM by KA9FOX offer classified swap ads for amateur radio and web design along to evoluted web hosting

Radio 2 Radio broadcasts amateur & HAM radio news and current events from around the world.

Mods for Kenwood TS-950SD / SDX

On-Line VP8CRB DXpedition Log

YU7EF 8 elements yagi antenna for 4 meters band

A home made 4 element yagi antenna that can be easily adapted for 10 meter band

Laser Engraved, Etched and Marked gift items for Amateur Radio Operators

Live scanner feeds for the Fire department for various sectors of the San Francisco Bay area.

The Shortwave Radio Audio Archive is a collection of shortwave radio recordings in both the form of a podcast and blog with embedded audio. The collection grows every day and includes both historic and modern day shortwave radio audio recordings

CW-R Explained. CW reverse mode CW-R receives CW signals with a reverse side CW carrier point like that of LSB and USB modes

The Information Source For Makers, Experimenters, DIY, Home Brewers, Restorers, and Amateur Radio Operators

Home of the Radio Teacher Project Website, study guides, class documents and videos to be used by instructors

Makers of QRP HF General Coverage Transceivers you can build. The Home of BITX transceivers, uBITX General Coverage Receiver-Transmitter. A general coverage, 10 watts HF SSB/CW transceiver kit with features you NEED for operating ease, convenience and versatility. It works from 3 MHz to 30 MHz, with up to 10 watts on SSB and CW, with a very sensitive receiver.

How to home made antenna traps with material you can easily find, and how to properly tune it.

Florida Antique Wireless Group

Enables every Ham to easily find repeaters across the the World, USA, Canada, Mexico and over 35 other countries, for free and without a network connection using the RepeaterBook Directory.

Manufacturer of Amateur and Commercial Repeater Controllers, Autopatches, and Accessories.

Portable chargers based on solar panel cells

K5DKZ review of the Kenwood TL 922A

Using external usb sound card devices for amateur radio digital modes operations

222 MHz kilowatt linear amplifier

Morse code quote of the day

Online morse code conversion tool

Python functions for converting decimal coordinates to QTH locator and backwards. Useful for program software developers to determine grid square locator, also known as maidenhead locator system.

Learnings from the 6Y4A CQ WW CW Contest By K2KW and N6BT

VK3RVZ IRLP Node 6506, covering the Port Phillip bay area and inner suburbs

Homemade LC Bandpass Filters for 20M, 30M, 40M In multi-station environments like special events, field day, portable operating, is very important to protect receivers from excessively strong signals. Bandpass filters help to protect your transceivers.

Off Road Enthusiasts that use Amateur Radio for recreation and public service.

NOAA-19 APT Recption using GNU Radio and a FUNcube Dongle

Receiver dynamic range is the ability of a receiver to receive a weak signal without loss of readability while a strong signal is present.

Tuning HF Coaxial Antenna Traps

Amateur radio makes the world a much smaller place.

An economical way of building an SSB filter. The circuit is for a filter with a 6 DB band width of roughly 2.2 KHz.

Both Watts and Volt-Amperes are units of measurement for electrical power. Learn what is the difference

It has been 40 years since the VHF-UHF Quagi antenna--a combination of the desirable features of a Yagi and a cubical quad--was developed and the design was first published in the newsletter of the Southern California VHF Club, a forerunner of today's Western States Weak Signal Society.

Bags, tool storage, portable solar panels dealer

How to build and connect the M710 Remote Cable

Interfacing the Jabra 9450 flex wireless headset to the Icom IC 7300 ham radio trasceiver.

How to correct keyclick problem in ft1000 and ft1000d radios.

Learn the new, natural way: Have a novel of your choice spelled out in English letter by letter. Letters and numbers gradually get replaced by Morse code.