Meteorite impacts are actually more common than you might first think. While most do not lead to mass extinction events like the one that might have ended the dinosaurs, they are far from a rare event.Here we investigate some of the biggest ones in history and find out just how regularly Earth is peppered by them.
Ham radio antenna combiners or diplexers are a useful item in many amateur radio stations.Antenna diplexers or combiners combine the signals from two sources on different frequencies and allow them to travel along a single feeder.One typical example of an amateur radio antenna diplexer use would be where an all band HF and VHF / UHF rig is used and a single output is available.
Although computer mice have been around for many years, they are still an essential element of many computers, especially desktop ones.The mouse used with a computer can be a matter of personal preference - some people will prefer some mice to others. They functionally enable a pointer on a screen to be positioned, and then most mice provide press capabilities on the right and left hand side of the front of the mouse to provide additional functionality.
Many people use tablet computers. These tablets provide a high degree of computing capability, combined with a good screen size, whilst economising on weight and size.These tablet computer provide a good compromise for many applications, and where great ease of use is required, many enable an external keyboard and sometimes a mouse to be used.
Printer ink / cartridges are a regular consumable for any printer. Different types last for a different amount of time, so it pays to be able to have a spare available for when the cartridge runs out.If the printer ink cartridge has already run out, then ordering one via out computer store will give a good chance of it being delivered very quickly so you can continue to print what is needed.
Power Banks Includes:What is a Power BankHow a power bank worksHow to use a power bankHow to buy best power bankWireless charging power bankPower banks are very popular these days. They come in all shapes and sizes and here is a huge variance in the cost of different ones.Choosing the right power bank for your particular use can be difficult.
Antenna Tuning Units, ATUs or Antenna Tuners are an essential item of equipment for any HF amateur radio or short wave listening station. These antenna tuners enable the antenna to be matched to the transmitter or receiver.For transmitting stations, ATUs are of particular importance because modern semiconductor based transmitters need to see a load that has a low level of reflected power to operate efficiently.
Job Application Process Includes:Job Application ProcessCV preparationJob application letterOnline job applicationJob interviewInterview etiquetteApart from preparing a CV one of the other major hurdles in seeking a new job is attending an interview. Whether it is for an electronics engineering job - electronics design, test engineering, or whether it is in software, or whether the job is in any other field, then attending an interview is certain to happen.
Yaesu has a proven pedigree in the amateur radio market place. The company has produced a good number of landmark amateur radio rigs and today has continued this tradition.Yaesu equipment is known for its performance and reliability - many of their high end rigs are very popular with contesters and other experienced ham radio operators.
The Radio Society of Great Britain has a wide portfolio of books about amateur radio covering all the main topics as well as a huge number of niche topics associated with the hobby.* Can& 39;t see what you want - just enter a different description in the search box.The Radio Society of Great Britain, RSGB has a wide catalogue of books about ham radio.
Multimeter Tutorial Includes:Test meter basicsAnalogue multimeterHow does an analogue multimeter workDMM digital multimeterHow a DMM worksDMM accuracy & resolutionHow to buy best digital multimeterHow to use a multimeterVoltage measurementCurrent measurementsResistance measurementsDiode & transistor testFault finding transistor circuitsMultimeters are very cheap to buy and are one of the most commonly used pieces of electronics test equipment.
Resistor values are organised into a set of different series of preferred values or standard resistor values.These standard resistor values have a logarithmically based sequence and this enables the different values to be spaced in such a way that they relate to the component tolerance or accuracy.Resistor tolerances are generally ±20 , ±10 ±5 , ±2 and ±1 .
Mixed signal oscilloscope, MSO are becoming increasingly popular as the need increases for combining the analogue measurement channels of an oscilloscope with the logic channels of a logic analyzer.When investigating boards with logic elements such as embedded systems using an MCU or MPU, it is often necessary a way to combine the analogue channels of a traditional scope so that waveforms can be investigated at the same time as seeing the logic levels on other areas of the circuit.
Scanners are widely available and many are not terribly expensive. There are often scanners available for most budgets. Check out the selection of scanner radios available below.* Can& 39;t see what you want - just enter a different description in the search box.There is a huge variation in the cost of scanners that can be bought - there is something to fit every budget.
Carbon composition resistors, often called carbon composite, or even carbon comp resistors are an old type of resistor that is not used in new equipment these days.These carbon composition resistors were used for many years as the main type of resistor in many valve or tube based equipment ranging from radios and television sets to more professional forms of electronic equipment.
Analogue storage oscilloscopes were used when it was necessary to store waveforms for visualisation later. These analog storage oscilloscopes were very expensive and as a result they were generally only used for specialist applications.The analog storage oscilloscope provided the capability for displays that would normally only persist for a fraction of a second could be stored for possibly several minutes.
About Electronics Notes:About Electronics NotesIan PooleBooks by Ian PooleAdvertise with Electronics NotesIan Poole has written over 20 books. The table below shows the dates all the books with publisher and dates of publication. Not all these books are now in print.TitleISBNPublisherPublicationYearAdditional detailsSuccessful Wire Antennas9781905086771Radio Society of Great Britain2012Jointly edited with Steve Telenius-LoweAntennas for VHF and Above9781905086450Radio Society of Great Britain2008Amateur Radio Explained (2nd Edition)9781905086320Radio Society of Great Britain2007Totally revised and re-set version of original text published under new ISBNHF Amateur Radio (second edition)1905086296Radio Society of Great Britain2007Cellular Communications Explained0750664355Newnes2006Practical Wire Antennas 21905086040Radio Society of Great Britain2005Ian Poole - EditorRadio Propagation: Principles and Practice1872309976Radio Society of Great Britain2004Newnes Guide to Radio and Communications Technology0750656123Newnes2003VHF / UHF Antennas1872309763Radio Society of Great Britain2002HF Amateur Radio1872309755Radio Society of Great Britain2001Digitally reprinted 2006Guide to VHF / UHF Amateur Radio1872309585Radio Society of Great Britain2000Amateur Radio Explained1872309704Radio Society of Great Britain2000Amateur Radio - the first 100 years1872309500Radio Society of Great Britain1999Author of text accompanying pictures from the RSGB archivesBasic Radio: Principles and Technology0750626321Newnes1998Reprinted 1999, 2000Your Guide to Propagation1872309496Radio Society of Great Britain1998Short Wave Listeners Guide0750626313Newnes1997Reprinted 1998Novice Radio Amateurs& 39; Handbook0859343758Bernard Babani1996Antennas for VHF and UHF0859342468Bernard Babani1994An Introduction to Scanners and Scanning085934256XBernard Babani1992Revised and reprinted 1996.
Capacitor Tutorial Includes:Capacitor usesCapacitor typesElectrolytic capacitorCeramic capacitorTantalum capacitorFilm capacitorsSilver mica capacitorSuper capacitorSMD capacitorSpecifications & parametersHow to buy capacitors - hints & tipsCapacitor codes & markingsConversion tableThe super capacitor is a specialised form of capacitor that offers exceedingly high levels of capacitance – sometimes up to many farads.
Capacitor Tutorial Includes:Capacitor usesCapacitor typesElectrolytic capacitorCeramic capacitorTantalum capacitorFilm capacitorsSilver mica capacitorSuper capacitorSMD capacitorSpecifications & parametersHow to buy capacitors - hints & tipsCapacitor codes & markingsConversion tableCapacitors have a variety of marking codes on them.
Coax Tutorial Includes:Coax feederCoax specifications overviewCoax impedanceCoax loss / attenuationCoax power ratingCoax velocity factorCoax environmentalCoax installation tipsCoax cable typesTips for choosing right coax cableBuying TV coax: points to noteInstalling coax cable can seem like a simple wiring task, but a few precautions, hints, and tips applied to the installation can make a huge difference after a few months.
Microphone Tutorial Includes:Microphone basicsMicrophone typesMicrophone specsMicrophone directionalityDynamic microphoneCondenser microphoneElectret microphoneRibbon microphoneCrystal / ceramic microphoneBoundary / PZM microphoneCarbon microphoneHow to buy best microphoneMicrophones for videoMicrophones for vocals/ singingWhen selecting a microphone for a given application it is necessary to understand the different specifications and parameters so that the best microphone can be chosen.