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Varactor Diode or Varicap Diode

Varactor / Varicap Diode Tutorial Includes:Varactor / varicapAbrupt & hyperabrupt varactorsVaractor specifications (datasheet)Varactor diode circuitsOther diodes: Diode typesVaractor or varicap diodes are used mainly in radio frequency or RF circuits to provide voltage controlled variable capacitance.
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Logic / Digital Circuit Design Guidelines

Logic / Digital Design Guidelines Includes:Design guidelines overviewSupply decouplingPCB groundplane usageUnused gatesDigital logic circuits are widely used in today& 39;s& 39; electronics. These circuits are used for a very wide variety of applications.From simple logic circuits consisting of a few logic gates, through to complicated microprocessor based systems.
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Zener Voltage Regulator Circuit

Power Supply Circuits Primer & Tutorial Includes:Power supply electronics overviewLinear power supplySwitch mode power supplyOver-voltage protectionPSU specsDigital PowerPower management bus: PMbusUninterruptible power supplyThe very simplest of voltage regulator circuits can be created using a simple series resistor and a zener diode.
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Electronics Construction & Manufacture

Constructing electronic circuits and equipment is one of the areas that makes the hobby enjoyable. Being able to say that you built it and it works gives a real feeling of satisfaction. However to obtain the best results when constructing circuits and projects, some know-how and some hints and tips help.
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What is an Erlang

Erlang Includes:Erlang basicsErlang BErlang CThe Erlang is a statistical measure of the voice traffic density in a telecommunications system. It is widely used because it is necessary to understand the required capacity in a network to be able to provision correctly for it. Insufficient capacity and some calls cannot be carried, too much and this leads to excess costs for unused capacity.
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Distributed Antenna System DAS Technology

DAS Technology Includes:DAS basicsThe concept of a Distributed Antenna System, DAS has many advantages in some applications. A Distributed antenna system, DAS is a network of antennas spaced apart from each other, but connected to a common source. In this way the DAS is able to provide wireless or radio coverage within a given area.
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IS-95, cdmaOne

CdmaOne / cdma2000 Technology Includes:IS95 / cdmaOneIS95 radio access interfaceIS95 handoff / handoverIS95 data channelscdma2000 1Xcdma2000 1X data channelscdma2000 1X Advancedcdma2000 1X EV-DO1X EV-DO radio interface1X EV-DO data channels1X EV-DO Rev.B1X EV-DO AdvancedUMB: 4G UltraMobile BroadbandIS-95 was the first CDMA mobile phone system to gain widespread use and it is found widely in North America.
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How Do Lead Acid Batteries Work

Battery Technology Includes:Battery technology overviewBattery definitions & termsNiCadNiMHLi-ionLead acidLead acid batteries are cheap, convenient and they work for many battery power applications. They are probably best known for their use in vehicles where they supply the power for everything from starting, to the electronics and much more.
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What is NFV: network functions virtualization basics

NFV, Network Functions Virtualisation Includes:NFV basicsVirtualised network functions, VNFNetwork Functions Virtualization, NFV is an approach to telecommunications networking where the network entities that traditionally used dedicated hardware items are now replaced with computers on which software runs to provide the same functionality.
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What is 6G Mobile Communications Technology

6G Mobile Communications Technology Includes:6G TechnologyAlthough the 5G mobile communications standard is still in the early days of its deployment, ideas are starting to come to the fore to consider what the next generation, i.e. 6G mobile communications might look like.It is perfectly normal to start looking at what 6G technology might include because the technology for 6G will take some while to develop.
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What is ISDN: Integrated Services Digital Network

ISDN Includes:ISDN basicsISDN or Integrated Services Digital Network is an international standard for end to end digital transmission of voice, data and signalling.ISDN can operate over copper based systems and allows the transmission of digital data over the telecommunications networks, typically ordinary copper based systems and providing higher data speeds and better quality than analogue transmission.
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What is 20mA Current Loop: serial data communications

The current loop technology for serial data communications is a technique that has some advantages over the more widely used voltage approach.Driven from a constant current supply, current loop is able to provide communications over long distances where voltage drops might be an issue.Although a variety of current levels can be sued, the most common, by far is 20 mA current loop.
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NXDN Land Mobile Radio

Private / Land Mobile Radio Includes:LMR / PMR basicsMPT1327TETRAP25DMRdPMRNXDNNXDN radio technology is a form of land mobile radio or business radio that was developed jointly by Icom and Kenwood in response to the need for radio communications systems that provided greater levels of spectrum efficiency over those that were already available while still keeping costs low.
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Satellite Frequency Bands Chart

Satellite Bands and Frequencies Includes:Satellite Frequency BandsSatellite technology is developing fast, and the applications for satellite technology are increasing all the time. Not only can satellites be used for radio communications applications, but they are also used for astronomy, weather forecasting, broadcasting, mapping and very many more applications.
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Licence Free Radios & Walkie Talkies

Licence free radio systems:Licence free radio systemsCitizens band, CBPMR446FRS Family Radio ServiceHow to use a licence free radioHints & tips on buying licence free radioOften licences are required for transmitters to be operated. Broadcasters need licenses to broadcast both audio and television transmissions, private mobile radio PMR users need licences as do many other users.
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RST Code

Codes & abbreviations includes:SummaryAbbreviationsRST codeQ codePhonetic alphabetWhen transmitting or receiving, it is very useful to be able to give and receive useful and consistent signal reports. It helps to guide how to conduct the contact. To achieve this, a system known as the RST reporting system is normally used.
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Understanding the Software Defined Radio Receiver SDR

Software Defined Radio Includes:SDR basicsSDR hardware architectureHow to buy the best SDRSoftware defined radio technology has advanced significantly in recent years. Advances in hardware mean that costs have fallen and performance has rise.This means that software defined radios are now seen in everything from high end radio communications equipment, to the simple USB plug in modules available at very low cost.
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Filter Bank Multicarrier Modulation, FBMC Tutorial

Filter Bank MultiCarrier, FBMC is a form of multi-carrier modulation that has its origins within OFDM. It is a development of OFDM and aims to overcome some of the issues, although this comes at the cost of increased signal processing.FBMC has a much better usage of the available channel capacity and is able to offer higher data rates within a given radio spectrum bandwidth, i.
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Top Ham Radio Contesting Hints and Tips

Contests & contesting includes:Contesting + calendarHints & tipsHam radio contesting is an exciting element of amateur or ham radio. Participating in contests can be rewarding and it also presents many new operating challenges and an opportunity to pit your wits against thousands of other ham radio operators and groups around the globe.
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UK Amateur Radio Call Signs (callsigns)

Ham radio call signs includes:CallsignsUK callsignsThere is a large number of different prefixes used for UK, British amateur radio callsigns or call signs. From a knowledge of these ham radio call signs it is possible to learn something about the licencee - the type of amateur radio or ham radio licence held and also when it was issued.
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