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gear:scanner [2024/06/26 01:10] – [Software-Defined Radio (SDR)] Humphrey Boa-Gartgear:scanner [2024/08/06 05:47] (current) – external edit 127.0.0.1
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 ====== Police Scanners ====== ====== Police Scanners ======
  
-The common **police scanner** is an essential intelligence-gathering tool for journalists, activists, neighborhood watch groups, spies, and more. With it, you can listen in on many of the conversations that law enforcement officers have with each other on their radios - from officers out on patrol, to the dispatch teams manning the radios at the precinct.+The common **police scanner** is an essential intelligence-gathering tool for journalists, activists, forward observers, neighborhood watch groups, spies, and more. With it, you can listen in on many of the conversations that law enforcement officers have with each other on their radios - from officers out on patrol, to the dispatch teams manning the radios at the precinct.
  
-The term "//police scanner//" is actually somewhat of a misnomer, as all of the devices described on this page can listen to more than just police frequencies, including fire/EMS, aircraft bands, marine radio, civilian walkie-talkie channels, and much much more.+The term "//police scanner//" is actually somewhat of a misnomer, as all of the devices described on this page can listen to more than just police frequencies, including fire/EMS, aircraft bands, [[gear:radio#marine-radio|marine radio]], [[gear:wx|weather radio]], [[gear:radio#frsgmrs-walkie-talkies|civilian walkie-talkie channels]], [[gear:radio#amateur-radio|amateur radio]], and much much more.
  
-Scanners are (usually) only capable of receiving audio. If you want to transmit, you will need a [[gear:radio|two-way walkie talkie or amateur radio]]+Scanners are (usually) only capable of receiving audio. If you want to transmit, you will need a [[gear:radio|two-way walkie talkie or amateur radio]].
  
 ===== Types of Scanners ===== ===== Types of Scanners =====
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 ==== Digital Scanners ==== ==== Digital Scanners ====
  
-If you are looking for maximum compatibility out-of-the-box with minimal configuration, you will need to pony up the cash for a **trunk-tracking digital scanner**. While they are a substantial investment up-front (especially if you have to purchase, yes **//purchase//**, a [[rr>Firmware_Upgrade_(Uniden_DMA_Scanners)|firmware update]] for your model), nothing beats having one of these mounted to your [[:vehicles|vehicle]] or [[gear:molle|tactical bag]], pre-programmed and ready to go.+If you are looking for maximum compatibility out-of-the-box with minimal configuration, you will need to pony up the cash for a **trunk-tracking digital scanner**. While they are a substantial investment up-front (especially if you have to purchase, yes **//purchase//**, a [[rr>Firmware_Upgrade_(Uniden_DMA_Scanners)|firmware update]] for your model), nothing beats having one of these mounted to your [[:vehicles|vehicle]] or [[gear:pals|tactical bag]], pre-programmed and ready to go.
  
 Some popular digital scanners with trunk-tracking capabilities include: Some popular digital scanners with trunk-tracking capabilities include:
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 [[wp>Software-defined radio]] (or **SDR**) is a simple type of radio tuner, which relies on piggybacked software to tell the radio what to do, instead of built-in firmware and hardware components. Many modern consumer radios are now glorified SDR's, as they are far cheaper to manufacture than your typical digital scanner. This is also extremely useful for hobbyists and other people with too much time on their hands, who can spend forever working on the perfect custom radio setup by tweaking some applications on their computer. [[wp>Software-defined radio]] (or **SDR**) is a simple type of radio tuner, which relies on piggybacked software to tell the radio what to do, instead of built-in firmware and hardware components. Many modern consumer radios are now glorified SDR's, as they are far cheaper to manufacture than your typical digital scanner. This is also extremely useful for hobbyists and other people with too much time on their hands, who can spend forever working on the perfect custom radio setup by tweaking some applications on their computer.
  
-The easiest way to get started with SDR, is with **RTL-SDR**, which is built off of the notoriously cheap and widely available [[https://www.realtek.com/Product/Index?id=615&cate_id=194|Realtek RTL2832U]]. For under fifty dollars, you can get an RTL-SDR starter kit from [[https://www.rtl-sdr.com/buy-rtl-sdr-dvb-t-dongles/|RTL-SDR Blog]] or [[https://www.nooelec.com/store/sdr/sdr-receivers/nesdr-smartee.html|Nooelec]], which works with any standard PC and even many phones, as long as you have the right software to make it work.+The easiest way to get started with SDR, is with **RTL-SDR**, which is built off of the notoriously cheap and widely available [[https://www.realtek.com/Product/Index?id=615&cate_id=194|Realtek RTL2832U]]. For under fifty dollars, you can get an RTL-SDR starter kit from [[https://www.rtl-sdr.com/buy-rtl-sdr-dvb-t-dongles/|RTL-SDR Blog]] or [[https://www.nooelec.com/store/sdr/sdr-receivers/nesdr-smartee.html|Nooelec]], which works with any standard PC and even many phones, as long as you have the right software to make it work. With RTL-SDR you can only receive (no transmit) which is fine if you are using it as a scanner, though some high-end SDR models let you transmit as well.
  
 **Note: If you choose to go the RTL-SDR route, __do so through Nooelec or RTL-SDR Blog__. Because anyone can order a crate of these RTL2832U chips and haphazardly slap them in a case, there are many RTL-SDR knockoffs which are infamously unreliable. DO NOT try to cheap out on these already inexpensive chips by going to Aliexpress or eBay, as YOU WILL REGRET IT.** **Note: If you choose to go the RTL-SDR route, __do so through Nooelec or RTL-SDR Blog__. Because anyone can order a crate of these RTL2832U chips and haphazardly slap them in a case, there are many RTL-SDR knockoffs which are infamously unreliable. DO NOT try to cheap out on these already inexpensive chips by going to Aliexpress or eBay, as YOU WILL REGRET IT.**
  
-The first drawback with RTL-SDR (and other similar SDR setups) is that you are basically on your own when it comes to the implementation. There are a bunch of open-source software applications that will do the heavy lifting for you, but you have to set them up yourself, and not all of them are available on every operating system. There are all sorts of guides and write-ups out there, but other than that, expect minimal documentation and lots of conflicting advice. Furthermore, expect to have to learn a lot of nitty-gritty details on how the radio spectrum even works, if you want to make sense of this software yourself. Also, trunk-tracking with these requires the use of [[https://www.rtl-sdr.com/rtl-sdr-tutorial-following-trunked-radio-unitrunker/|two RTL-SDR's running simultaneously]], each with their own antennas. After that, you will find out that regular broadcast AM/FM signals and background noise will overpower your radio and "intrude" on other frequencies, necessitating the use of a bunch of extra in-line filters and low noise amplifiers if you even want to hear anything of value. Then there's the matter of cable management, as instead of a single device you now have a bunch of tiny dongles and filters and external antennas all daisy-chained to your computer or phone, which is not practical on the field at all, and especially not while driving.+The first drawback with RTL-SDR (and other similar SDR setups) is that you are basically on your own when it comes to the implementation. There are a bunch of open-source software applications that will do the heavy lifting for you, but you have to set them up yourself, and not all of them are available on every operating system. There are all sorts of guides and write-ups out there, but other than that, expect minimal documentation and lots of conflicting advice. Furthermore, expect to have to learn a lot of nitty-gritty details on how the radio spectrum even works, if you want to make sense of this software yourself. Also, trunk-tracking with these requires the use of [[https://www.rtl-sdr.com/rtl-sdr-tutorial-following-trunked-radio-unitrunker/|two RTL-SDR's running simultaneously]], each with their own antennas. After that, you will find out that regular broadcast AM/FM signals and background noise will overpower your radio and "intrude" on other frequencies, necessitating the use of a bunch of extra in-line filters and low noise amplifiers if you even want to hear anything of value. Then there's the matter of cable management, as instead of a single device you now have a bunch of tiny dongles and filters and external antennas all daisy-chained to your computer or phone, which is not practical on the field at all, and especially not while driving. And don't forget spare batteries, as plugging your computer into an outlet or your car's cigarette lighter can introduce **even more** radio interference.
  
 For these reasons, many people will just give up and buy one of the digital scanners mentioned in the above section. But, if you persevere, and make it work, then the knowledge, skills & capabilities you will acquire as a result will make you a radio-god among Anons. For these reasons, many people will just give up and buy one of the digital scanners mentioned in the above section. But, if you persevere, and make it work, then the knowledge, skills & capabilities you will acquire as a result will make you a radio-god among Anons.
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 The trade-off with these apps is that, since the scanners streaming to these websites are tuned to specific frequencies by their owners, you cannot just tune to a random part of the dial. Whatever stations are on the list at the time, are the ones that you get. The trade-off with these apps is that, since the scanners streaming to these websites are tuned to specific frequencies by their owners, you cannot just tune to a random part of the dial. Whatever stations are on the list at the time, are the ones that you get.
  
-Furthermore, if you're reliant on a cell phone signal for mobile data, police can track your movements with a [[hazards:stingray]], or cut the towers entirely. Neither of these are things you want to deal with on the field, so you will definitely want to upgrade to one of the physical radio options above if you plan on doing radio recon on a regular basis.+Furthermore, if you're reliant on a cell phone signal for mobile data, police can track you with a [[hazards:stingray]], or cut the towers entirely. Neither of these are things you want to deal with on the field, so you will definitely want to upgrade to one of the physical radio options above if you plan on doing radio recon on a regular basis.
  
 ===== Scanner Counter-Intelligence ===== ===== Scanner Counter-Intelligence =====
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 ===== Encrypted Radio ===== ===== Encrypted Radio =====
  
-Some police departments really do not like the general public listening to their conversations, and so they **encrypt** their transmissions. In some cities they will only encrypt some channels, and leave others open. In other cities, they encrypt everything. In either case, when it comes to encrypted frequencies, you will only hear a bunch of noise if you try to tune in. Short of having a person inside the police department to steal one of their radios (which can be remotely disabled once someone notices it is missing) there is no way around this, and it may be illegal in your locality to even try and bypass this encryption.+Some police departments really do not like the general public listening to their conversations, and so they **encrypt** their transmissions. In some cities they will only encrypt some channels, and leave others open. In other cities, they encrypt everything. In either case, when it comes to encrypted frequencies, you will only hear a bunch of noise if you try to tune in. Short of having a person inside the police department to steal one of their radios //(which **WILL** be remotely disabled once someone notices it is missing, and then **YOU WILL** be hunted down)// there is no way around this. Even if you don't steal a radio, it might still be illegal in your locality to try and bypass this encryption through any other means.
  
 For an list of agencies known to use encrypted communications, check out [[rr>Encrypted_Agencies|this list at the RadioReference Wiki]]. For an list of agencies known to use encrypted communications, check out [[rr>Encrypted_Agencies|this list at the RadioReference Wiki]].
  
  
-{{tag>Gear Radio}}+{{tag>Gear Radio Recon}}
gear/scanner.1719364202.txt.gz · Last modified: 2024/08/06 05:50 (external edit)

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