protection

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protection

60 links - and 2 categories

Antennas : Repair and Maintenance
  • Corrosion in a marine installation - We all understand the importance of corrosion protection, especially in harsh marine environments. This article explains different types of corrosion and how to avoid them
    [ Hits: 394 | Votes: 3 | Rating: 3.67 ]
Antennas : Theory : Impedance matching
  • The Gamma Match - The gamma match was originally invented as a means of feeding vertical monopole antennas for medium wave broadcasts, which were earthed at the base for lightning protection- Hams are more likely to use a gamma match to feed a dipole or loop element, but the basic theory is easier to understand for the case of a quarter wave monopole.
    [ Hits: 954 | Votes: 2 | Rating: 4.5 ]
DX Resources : Ham Radio Awards
  • BOTA Beaches on the Air - Beaches On The Air is an award scheme for radio amateurs that encourages portable operation from beaches. You can participate from any country or region around the world. Our beach lists currently contain more than 30,000 beaches and aim to be as exhaustive and objective as possible, and are often based on official sources, such as environmental protection agencies.
    [ Hits: 143 | Votes: 1 | Rating: 10 ]
Manufacturers : Amplifiers
  • R3KBO EB104.ru Amateur Radio Products - R3KBO is an amateur radio club producing and developing amateur radio kits and assembled products including HF VHF Power Amplifiers or RF Power Kits and amplifier parts, low pass filfers, band pass filters, sourge protections, splitters and combiners, antenna switches
    [ Hits: 511 | Votes: 1 | Rating: 10 ]
Manufacturers : Lightning and Surge Protection
  • VFC LP Lightning Protection Products - VFC has grown to become the national leader in the lightning protection industry. Protecting facilities and equipment from lightning and transient current by designing and installing lightning protection, grounding, surge protection and lightning warning systems.
    [ Hits: 90 | Votes: 0 | Rating: 0 ]
Manufacturers : Power Supply
  • Alpha Power Systems LLC - Alpha Power Systems, LLC is committed to offering the highest quality of surge protection and power quality products, such us Backup UPS available with service second to none
    [ Hits: 129 | Votes: 0 | Rating: 0 ]
Radio Equipment : HF Transceivers : Yaesu FT-817
  • FT-817 Batteries for Air Travel - Three cell Lipo batteries for the FT-817 work really well, although not really sure about taking them on aircraft. The Lipos intended for use on RC Electric airplanes generally have a very low internal resistance and no internal protection against short circuit.
    [ Hits: 140 | Votes: 0 | Rating: 0 ]
Technical Reference : Amplifiers : HF Amplifiers
  • 600W LDMOS Power Amplifier - A comeplete home made 600W LDMOS RF power amplifier. Settings can be made on a 7-inch touch screen, and on this screen you can see a lot of useful information during operation, such as output power, temperature, SWR, and so on. The power amplifier includes 2 MRF300 LDMOS FETs and several built-in sensors. The amplifier also contains several types of protection functions like too high current, too high swr, too high temperature, etc.
    [ Hits: 868 | Votes: 1 | Rating: 10 ]
Technical Reference : Batteries : Battery Charger
  • How to Make an Automatic 12V Battery Charger - A home made battery charger 110-220 v AC providing from 1.25-24 v DC Adjustable at 8 Amps output power, with Short Circuit Protection Over Load and over charge Protection.
    [ Hits: 150 | Votes: 0 | Rating: 0 ]
Technical Reference : Lightning Protection Technical Reference : Power Supply Technical Reference : RF Safety
  • RF Standards and Regulations - There are many different RF safety standards and regulations used throughout the world, here are discussed: US FCC regulations, IEEE standard, Canadian Safety Code 6 and International Council on Non-Ionizing Radiation Protection
    [ Hits: 159 | Votes: 0 | Rating: 0 ]
Technical Reference : Receiver Front-End Protector
  • Receiver Front End Protection - A simple receiver front end protection ciruit idea to protect your receiver when it is not in use
    [ Hits: 1707 | Votes: 1 | Rating: 4 ]
  • RF Front End Protector - If You are using a separate receive antennas then you need a good protection circuit to eliminate the possibility of blowing out the receiver front-end while using these auxiliary receive antennas specially on low bands.
    [ Hits: 176 | Votes: 0 | Rating: 0 ]
  • Receiver Protection in SO2R and Beverage Antennas - How to protect your receiver when operating in SO2R and using beverage antennas. A custom protection box made with two resistors and 2 stack of diodes.
    [ Hits: 225 | Votes: 0 | Rating: 0 ]
Technical Reference : Test Equipment
  • Anderson Powerpole Polarity Checker Project - A polarity checker is a very useful item to have around the shack and in a go-kit. This project, inspired by a QST article on powerpole connector protection illustrate how to build a polarity checker.
    [ Hits: 168 | Votes: 0 | Rating: 0 ]

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