cat system181 links
Antennas : J-Pole
- J-Pole theory
- The J-Pole antenna is an omnidirectional antenna that can be used for base, mobile and field day stations. It does not need a ground plane, radials or a complicated matching system. The J-Pole can be cheaply, simply and quickly constructed using a variety of techniques, some of which are discussed in this article.
[ Hits: 29681 | Votes: 25 | Rating: 6.74 ]
- Understanding Standing Wave Ratios SWR
- We worry a lot about Standing Wave Ratio (SWR) in amateur radio since SWR is one indication of how well our antenna system is working. Most HF transceivers and antenna tuners have built in SWR meters. SWR is a measure of a transceiver'
s output power verses the portion of that power reflected by the antenna system
[ Hits: 8263 | Votes: 8 | Rating: 4.75 ]
- Antenna Polarization notes
- Antenna polarization is a very important consideration when choosing and installing an antenna. Most communications systems use either vertical, horizontal or circular polarization. Knowing the difference between polarizations and how to maximize their benefit is very important to the antenna user.
[ Hits: 2244 | Votes: 4 | Rating: 3.50 ]
- SSA - Non-Directional Beacon
- Airport Locator Beacon, The NDB-SS05 is a complete Dual Non-Directional Navigational Beacon system built to ICAO Annex 10 requirements. It is designed for continuous duty, outdoors operation, easy maintenance and is supported by a full complement of accessories and spare parts.
[ Hits: 1089 | Votes: 0 | Rating: 0.00 ]
- Elko Amateur Radio Club
- An ARRL Special Service Club located in Northeast Nevada. Operates one of the largest linked repeater systems in the State of Nevada.
[ Hits: 646 | Votes: 3 | Rating: 10.00 ]
- GLA Systems
- Texas BugCatcher antenna manufacturers. Mobile antenna for hf bands. The serious HF Mobile Antenna by Henry Allen, K5BUG
[ Hits: 1522 | Votes: 2 | Rating: 9.50 ]
- Massachusetts Microwave Corporation
- Provider of point-to-point microwave radio system sales, service, and integration, employing refurbished name brand digital (DS1/E1, DS3/E3) and analog video radios. Specializing in Microwave Associates (M/A-COM) , Digital Microwave Corp. (DMC/Stratex) and Alcatel/Rockwell microwave radios.
[ Hits: 1240 | Votes: 1 | Rating: 2.00 ]
- Integrated Tower Systems-ITS
- Premier OEM of portable tower systems, Communication-Site-on-Wheels (COWs), heavy-duty fixed foundation telescopic structures commercial and military, worldwide sales and leasing
[ Hits: 2374 | Votes: 14 | Rating: 7.00 ]
- The Brookdale ATV Repeater System
- Provide an ATV repeater function for the North Jersey Exterior Area that is available not only for general amateur radio use, but also for providing a unique communications resource during emergencies as well (FCC Part 97.1 (a))
[ Hits: 404 | Votes: 0 | Rating: 0.00 ]
- About AMTOR
- AmTOR may be considered as the next development from RTTY. AmTOR was introduced to overcome the problems with RTTY. As a result of its performance, it has become popular on the HF bands because it gives more reliable communication, especially when interference is present. It achieves this by using a coding system that allows errors to be detected and corrected.
[ Hits: 236 | Votes: 0 | Rating: 0.00 ]
- Global Positioning System Primer
- Welcome to the Global Positioning System (GPS)
What is GPS? What is Navigation?
GPS Elements Satellites in Space Ground Control Stations and Receivers, How GPS Works - An Amazing System, Military Uses for GPS
[ Hits: 1110 | Votes: 0 | Rating: 0.00 ]
- Albuquerque Transmitter Hunting
- An active group of Amateur Radio operators who locate hidden transmitters for fun and in times of need, such as determining the source of interference to local repeater systems or individuals who use the Amateur Radio bands illegally.
[ Hits: 337 | Votes: 0 | Rating: 0.00 ]
- SB-220 / 200 Amplifier with Solid-State Transceivers
- Using Solid-State Transceivers With Older Tube Amplifiers, some Hines and Kinks on the Heath SB-220/200 that can be useful in your application
[ Hits: 1106 | Votes: 1 | Rating: 10.00 ]
- ACARS VHF Data
- The first of a series of articles that provide an introduction to the latest ICAO defined digital communication modes, including VDL modes 2, 3 and 4. In this edition we begin with the current ACARS application then bring this up to date with AOA.
[ Hits: 2859 | Votes: 10 | Rating: 5.50 ]
- Dino's Tower Service
- Located in North Florida, specializing in tower installations, antenna assembly, and wire antennas. Experience includes a variety of antennas and towers from Rohn 25 up to Rohn 65 and rotating tower systems (KOXG).
[ Hits: 995 | Votes: 1 | Rating: 1.00 ]
- Wolverine Power Systems
- Wolverine Power Systems provides generators, rental, service and repair located in Holland, Michigan.
[ Hits: 626 | Votes: 0 | Rating: 0.00 ]
- Pascall Electronics
- Pascall's specialist RF & Microwave division specialise in components for radar, EW receivers, navigation & location equipment, communication and marine safety systems.
[ Hits: 428 | Votes: 0 | Rating: 0.00 ]
- AFU Knoppix
- The AFU Knoppix CD contains software for the operating modes of PSK31, RTTY, SSTV, FAX, APRS and packet radio. Additional applications for Sat tracking, logging, locator referencing and antenna computation are also included.
The CD is targeted for radio enthusiasts, the Linux operating system and the applications on this CD are structured so that they can run from the CD without effecting the installed existing system software. *
[ Hits: 5300 | Votes: 4 | Rating: 3.75 ]
- DX ToolBox
- DX Toolbox searches the web for you, gathering information on solar and geomagnetic conditions that affect radio propagation. It's ideal for the ham radio operator, shortwave listener, or other radio enthusiast.
[ Hits: 6126 | Votes: 6 | Rating: 7.83 ]
- Station Lightning Protection
- This website outlays the basic knowledge, safe design and installed equipment that are employed in the lightning protection system of a US Coast Guard Auxiliary Radio Facility. This should also be relevant to the Civil Air Patrol, MARS, and Amateur Radio stations who provide emergency communications capability for public safety or the military
[ Hits: 2352 | Votes: 5 | Rating: 6.40 ]
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