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- | ====== Guidance for using measuring devices ====== | ||
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- | //related articles// | ||
- | * [[home: | ||
- | * [[home: | ||
- | * [[home: | ||
- | * [[home: | ||
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- | ===== CORNET Meter ===== | ||
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- | Adding problem signals from TV, FM, Cell phones, WiFi, SmartMeters, | ||
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- | < | ||
- | //Trevor Marshall, PhD//</ | ||
- | ===== RF Explorer ===== | ||
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- | The RF Explorer is a spectrum analyzer. | ||
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- | ==== Use FAST filter and PEAK HOLD on an RF explorer to explore digital signals. ==== | ||
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- | The antennas which came with the RFexplorer will give you a good idea what the signal strengths are, but when you want accurate measurements you will need to have a reasonably decent antenna. | ||
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- | < | ||
- | Here is where I usually set up my Rfexplorer when surveying a new site: | ||
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- | 3G/4G frequencies: | ||
- | Center Freq: 2200 | ||
- | Freq Span: 600 | ||
- | Module 15-2700 | ||
- | Calculator: Max Hold | ||
- | Top dBm: -30 | ||
- | Bottom dBm: -100 | ||
- | Iterations: 005 | ||
- | Offset:0 | ||
- | Units: dBm | ||
- | Draw Mode: Vectors | ||
- | Marker: Peak | ||
- | DSP: Fast | ||
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- | This setup covers 1900MHz to 2500MHz and shows you DECT phones at far left, WiFi at far right, with the main 3G/4G bands in between. For looking at DECT in particular I use Center Freq:1925 Span:10. For just WiFi I use 2450 span 100. There are also some less active 2G/3G/4G bands between 700MHz and 1000Mhz, and some 4G between 2500 and 2700Mhz. | ||
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- | //Trevor Marshall, PhD//</ | ||
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- | ===== Antenna ===== | ||
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- | Supplied antennae are not accurate enough. | ||
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- | ==== RF Explorer ==== | ||
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- | The small (WiFi) antenna that came with the RF Explorer was no use at all, and the extendable antenna has a coil in its base which stops it working properly at high frequencies. The ' | ||
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- | ==== Cornet ==== | ||
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- | The antenna supplied with the Cornet meter is ineffective for our purposes. Research team has been using two others. | ||
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- | The whip antenna is very useful for most of the time. | ||
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- | The Log antenna is used when you are trying to identify the direction a signal is coming from. This becomes more important once the environment is mostly quiet and you are tracking down the remaining external sources. | ||
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- | An example is this video- | ||
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- | [[https:// | ||
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- | note that his meter is not showing the very low power sources that we have found to be significant | ||
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- | ==== Using antenna for Cornet meter ==== | ||
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- | [[http:// | ||
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- | < | ||
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- | Yep, that's the charging unit. Just put the battery in it and plug it in to the wall socket. Don't recall which light goes on when fully charged but I think it was green. Might be yellow when not fully charged. | ||
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- | Sound is explained in the user manual. | ||
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- | // | ||
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- | < | ||
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- | //Trevor Marshall//</ | ||
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- | === To vary frequency extend whip antenna === | ||
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- | < | ||
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- | Here are the optimal frequencies for various number of sections from 1 to 7: | ||
- | Collapsed | ||
- | 2000 1040 750 600 490 420 375 | ||
- | 680 410 300 240 200 170 150 | ||
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- | So for 2000Mhz or 680MHz you could only use one section, while fully extended the whip is best for 375 or 150Mhz (at 5/8 or quarter-wave). But, in practice, a fully extended whip will give a solid reading on the Cornet. Collapse it down if you want to get rid of 2-way radios and FM stations and give preference to the microwave sources | ||
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- | //Trevor Marshall, PhD//</ | ||
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- | ==== Using antenna for RFexplorer ==== | ||
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- | The black whip which comes with the RFexplorer has a loading coil inductor in its base. | ||
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- | This video shows somebody removing it: | ||
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- | {{https:// | ||
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- | The coil stops high frequencies from coming through. Above 200MHz you can use either a straight whip (as I do) or one of the wideband UHF antennas (like I also do). | ||
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- | === Replacing antenna === | ||
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- | This discussion talks about removing antennas and replacing with a bigger one: | ||
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- | [[http:// | ||
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- | The connectors are hidden under a plastic slip-ring. You have to squeeze the plastic ring to begin unscrewing the RP-SMA plug underneath. Most routers have a similar system. | ||
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- | These SMA connectors are Reverse Polarity (RP-SMA) and will not plug together with the RFexplorer or Cornet without damage.. | ||
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- | ==== Settings ==== | ||
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- | === operating frequencies === | ||
- | |||
- | < | ||
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- | Here is where I usually set up my Rfexplorer when surveying a new site: | ||
- | 3G/4G frequencies: | ||
- | Center Freq: 2200 | ||
- | Freq [highlight= # | ||
- | Module 15-2700 | ||
- | Calculator: Max Hold | ||
- | Top dBm: -30 | ||
- | Bottom dBm: -100 | ||
- | Iterations: 005 | ||
- | Offset:0 | ||
- | Units: dBm | ||
- | Draw Mode: Vectors | ||
- | Marker: Peak | ||
- | DSP: Fast | ||
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- | This setup covers 1900MHz to 2500MHz and shows you DECT phones at far left, WiFi at far right, with the main 3G/4G bands in between. For looking at DECT in particular I use Center Freq:1925 [highlight= # | ||
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- | --------------------------- | ||
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- | The Rfexplorer has to be set to " | ||
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- | To find the CWS, the signal is so weak that you have to reduce the bandwidth, reducing the noise in each sample, and so I usually scan 27.12MHz center with [highlight= # | ||
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- | For Smartmeters I use the other module, SUB1G, set for 915MHz centre with a 26MHz [highlight= # | ||
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- | For DECT phones I use 1925MHz [highlight= # | ||
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- | //Trevor Marshall, PhD// | ||
- | </ | ||
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- | < | ||
- | Here is where I usually set up my Rfexplorer when surveying a new site: | ||
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- | 3G/4G frequencies: | ||
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- | Center Freq: 2200 | ||
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- | Freq Span: 600 | ||
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- | Module 15-2700 | ||
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- | Calculator: Max Hold | ||
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- | Top dBm: -30 | ||
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- | Bottom dBm: -100 | ||
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- | Iterations: 005 | ||
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- | Offset:0 | ||
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- | Units: dBm | ||
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- | Draw Mode: Vectors | ||
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- | Marker: Peak | ||
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- | DSP: Fast | ||
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- | This setup covers 1900MHz to 2500MHz and shows you DECT phones at far left, WiFi at far right, with the main 3G/4G bands in between. For looking at DECT in particular I use Center Freq:1925 Span:10. For just WiFi I use 2450 span 100. There are also some less active 2G/3G/4G bands between 700MHz and 1000Mhz, and some 4G between 2500 and 2700Mhz. | ||
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- | </ | ||
- | ===== External Power Source ===== | ||
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- | We recommend this external power source for both CWS: | ||
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- | ===== Operating Instructions ===== | ||
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- | CHARGE BEFORE USE | ||
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- | ==== Charging the Instant USB Charger: ==== | ||
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- | * | ||
- | * | ||
- | * Connect the mini USB end of the cable provided to the Instant USB Charger' | ||
- | * | ||
- | * Connect the USB end of the cable provided to your computer' | ||
- | * | ||
- | * The Instant USB Charger' | ||
- | * | ||
- | * When the battery is fully charged, the charge indicator light, located at the end of the charger, turns green. Disconnect the charger from the USB cable. The charger is now ready to use. | ||
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- | ==== Using the Instant USB Charger: ==== | ||
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- | The Instant USB Charger must be fully charged before use (see " | ||
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- | Connect a USB cable compatible with your device to the USB Power Port. A device-specific USB cable is not supplied. These are available from almost all electrical retailers. The cable supplied for connecting the USB to the mini USB is compatible with newer Motorola® mobile phones and BlackBerrys®. Please note most newer Motorola® mobile phones cannot be charged using conventional USB cables. For such devices, the mini USB cable supplied must be used. | ||
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- | * Connect the other end of the USB cable to your device. | ||
- | * | ||
- | * Turn the Instant USB Charger switch to the ON position. | ||
- | * | ||
- | * The LED status light turns green, indicating that the Instant USB Charger is charging your device. The LED status light turns red when the charger is flat and needs to be recharged. | ||
- | * | ||
- | * When the charger is not in use, the switch must be turned to the OFF position. This will prevent the charger from losing its charge. | ||
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- | === CAUTION === | ||
- | The lithium-ion rechargeable battery used in this charging device may present a risk of fire or chemical burn if mistreated. Do not disassemble, | ||
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- | ===== IMPORTANT SAFETY INSTRUCTIONS ===== | ||
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- | when used correctly, lithium-ion rechargeable batteries provide a safe and dependable source of portable power. However, if they are misused or abused, this may result in leakage, burns, fire or explosion/ | ||
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- | * Do not disassemble the charging device. There are no user-serviceable parts inside. Incorrect reassembly may result in shock or fire hazard. | ||
- | * | ||
- | * Do not drop or subject the charging device to strong mechanical shock. | ||
- | * | ||
- | * Do not expose the charging device to moisture, water, rain, snow or spray. | ||
- | * | ||
- | * Do not insert any object into the ports or openings of the charging device. | ||
- | * | ||
- | * Do not operate the charging device if it has received a sharp blow, been dropped, or otherwise been damaged in any way. | ||
- | * | ||
- | * Do not use in environments where the temperature is 40°C (104°F) or greater. | ||
- | * | ||
- | * Keep out of reach of children. | ||
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- | To reduce the risk of electric shock, unplug the charging device from any power source before attempting any maintenance or clearing. | ||
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- | === CORRECT DISPOSAL FOR THIS DEVICE === | ||
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- | Do not throw away. | ||
- | Please follow local requirements to recycle electronic appliances and batteries. | ||
- | ===== Warnings ===== | ||
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- | ==== Care of equipment ==== | ||
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- | From the RF Explorer user manual | ||
- | This is a battery operated device, please charge the battery before use; it comes with half charge as the standard way to extend the battery life when it is stored for an undetermined period of time on the shop. | ||
- | But to use it you should fully charge it. Never charge your device unattended. | ||
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- | === source may damage meters === | ||
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- | <note warning> | ||
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- | < | ||
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- | < | ||
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- | ===== Notes and comments ===== | ||
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- | product detail of Huawei Antenna HA-KKa 5dbi 690-960/ 1710-2620MHz 4G LTE Antenna | ||
- | ===== References ====== | ||
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