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Restoration of Viking Valiant, Hammarlund SP-600 and Heathkit HX-10 Marauder by KG9OM and KJ4W

50 Plus Years of Ham Radio

Radio electronic and antenna consulting, servicing and buildups of customer supplied components. Transmitter and receiver site work and on line help.

Kenwood TS 480 english manual in pdf format

Notes on how to build an inverted V wire antenna with lenghts for all HF bands from 160 mtrs to 10 mtrs

Windows shareware contest log program for the CQ WW DX contest. The contest log software offers a Network version capable to run over a local area network in order to allow several pc to update a single shared contest log file. Windows XP through Windows 10.

CREST Communications REACT Team #4252 has been an active member of the community for almost 30 years and is one of the largest REACT Teams in the United States.

Several HD video overlay devices are offered, including the GeoStamp HD, which overlays GPS latitude, longitude, heading, speed, altitude, date, time, and depth onto AHD, HD-TVI, and HD-CVI (720p/1080p) video sources. The VideoStamp HD allows user-defined text overlays on similar HD video inputs, while the VideoStamp Keyboard HD enables text input via a PS/2 keyboard for video overlay. For commercial applications, the PostMark HD integrates with cash registers and POS terminals to overlay transaction data onto security camera feeds. Beyond HD video solutions, the DTMF-8 DTMF Decoder provides remote control capabilities for up to eight devices or relays using touch tones from a radio or other audio source. This decoder supports four operational modes and includes password protection, storing all settings in non-volatile EEPROM memory. The product line also includes standard definition OSD, RS-232, GPS, and POS text inserters, along with various DTMF encoders and DVR solutions.

WeatherExperts.Com, the premier online store for weather stations, instruments, anemometers, barometers, accesories, and satellite pictures. Excellent prices!

This app will give you a 16 tone DTMF keypad and the ability to generate custom DTMF sequences, and set the duration and tone to silence ratio. Includes the characters 1234567890*# and the menu tones ABCD. You may enter a custom sequence via the keypad, soft keyboard, or speech if your device already has speech-to-text capability. This is basically a touch tone telephone keypad, which may be of interest to amateur ham radio repeater operators

Manufacture of microwave directional, omni directional, sector and multisector antennas with horizontal polarization for ISM band 2,4 GHz

Total Internet Linking information...

Evaluation of various operating modes on 600 meters

Homemade moxon antenna for the 40 meter band. This article is not very descriptive but includes some very detailed images

RG-174/U article on usage by AA5TB

Homepage for SND Tube Sales

MyAntennas.com offers standard and custom made multiband antennas, Baluns, Common Mode chokes and accessories. All products are designed and made by Danny Horvat, E73M an antenna design engineer formerly employed by Cushcraft Corporation.

The following are the opinions expressed by various amateurs.

Study of the Coaxial Dipole: Just how does this thing work.

UnidenCommander, Uniden Commander provides full control over your Uniden Bearcat scanner from your PC and even adds functionality which is not normally available on your Uniden Bearcat scanner.

About basics of the horn antenna used for many rf microwave antenna applications.

First pictures and links for the Kenwood TS-990S HF and 50 Mhz transceiver releases in May 2012

tk7 is open source software designed for the ICOM IC-Q7 walkie-talkie. Though tk7 is intended chiefly for Linux, MacOS X, and BSD users, it will work on Microsoft Windows too.

The configuration of this antenna is a triangle with apex in the top of a very tall tree. The antenna is fed at a bottom corner using 450 ohm ladder line.

Log Search for 9M0L Log online

Interface APRS to a weather station

A Few facts concerning GMT, UT, and the RGO

Layman level explanations of "seemingly" mysterious LF MF and HF propagation occurrences.

The largest domestic manufacturer ofair-dielectric variable capacitors located in edgerton, ohio.

11 Years of monthly propagation reports from February 1988 to January 1999 by AD5Q

Steel City Amateur Radio Club Pittsburgh

VK9MT Online Log Search - Mellish Reef 2014

Mark Connelly, WA1ION article on Medium Frequency Amplifier Circuits in PDF format, include some RF amplifier schematics

Valcom Guelph specializes in the design and manufacturing of a full range of MF Beacon 100 KHz - 600 KHz, AM Broadcasting 540 - 1700 KHz, HF 1.8 - 30 MHz, VHF 30 - 300 MHz and UHF 300 - 1,200 MHz and SHF up to 6 GHz antennas based in Canada

Manually programming D-Star handheld transceivers like the _Icom ID-51A_ and _ID-31A_ can be a straightforward process, enabling operators to configure repeaters, simplex frequencies, and D-Star specific settings without relying on computer software. This method is particularly useful for field operations or when quick adjustments are needed, allowing hams to set up callsign routing, DR mode, and reflector links directly from the radio's interface. Understanding the menu structure and key sequences is crucial for efficient on-the-fly programming. Operators often find manual programming invaluable for activating new D-Star repeaters encountered during travel or for participating in local nets where specific G2 or G3 gateway configurations are required. While software like _CS-51_ offers convenience for bulk programming, the ability to manually input frequencies and D-Star parameters ensures operational flexibility. This approach also helps hams troubleshoot connectivity issues by verifying individual settings directly on the transceiver, ensuring proper D-Star registration and gateway access.

A 220-ft tower that has five catenary lines, each about 500 feet long. Four of these lines, running NE, SE, SW, and NW support four 1/4-wavelength wire verticals used in a 160-meter four-square antenna.

Live audio of the National Hurricane Center’s Skywarn Nets. This live feed covers several different states, and locations throughout the US including: TX, LA, MS, AL, FL, GA, SC, NC, VA, MD, DE, PA, NJ, NY, CT, RI, MA, VT, and ME

Used in the Kenwood TM-241, TM-741 2m module by W3KKC

This sweeper built for a narrow bandwidth filter adjustment, use a simple 555 version sawtooth wave generator.

All about stacking and matching yagi antennas.

Vintage radio equipment and memorabilia 1910 - 1950

A little information about my equipment, qsl cards etc.

Demonstrates a range of specialized radio frequency equipment and consulting services for amateur and professional applications. The offerings include _Vector-Finder_ direction finding antennas, various test equipment such as _gate dip meters_ and RF sniffers, and communications receiving adjuncts. Additionally, the company produces satellite antennas for weather satellite reception, voice amplification devices like the _Flex-Mike_, and custom prototype circuit boards. The company's product line addresses needs for precise RF measurement, signal detection, and specialized antenna systems, particularly for direction finding and satellite communications. Their historical association with National Radio (HRO) suggests a legacy in radio technology. The site also highlights a subsidiary, Sierra Mountain Products, which offers outdoor recreational gear, indicating a diversification beyond core RF manufacturing.

WA3KEY Virtual Collins Radio Museum. A complete resource for Collins Radio users, collectors and restorers.

A complete guide to undestand and know how electret condensor microphone elements works by K3DAV

Microhams is a dynamic organization of hams in the Puget Sound area. The club includes a broad range of people from our local tech industry who participate in just about every aspect of our hobby.

A multiband trapped end-fed antenna can cover 20 30 40m bands. An option for portable sota operations were weight end simplicity are essential

Analysis of N3UJJ installed antennas using the AIM4170b Antenna Analyzer

A freeware windows antenna design and modelling software developed by an amateur radio operators primarily intended for VHF yagi aerials.

Autocode makes a selection of fine morse code identifiers for commercial and amateur radio applications.