Signal Harbor

Time 2020-12-16 16:04:18

Web Name: Signal Harbor

WebSite: http://www.signalharbor.com

ID:136089

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Project 25 Technology Interest Group (PTIG)maintains lists of known P25 systems. Note that these listsare in Portable Document Format (PDF).Click here for theInteroperable Communications Technical Assistance Program. The page has a link to downloadthe latest National Interoperability Field Operations Guide (NIFOG).FEMA Fire Service GuideClick on the image to download a PDF of Voice Radio Communications Guide for the Fire Servicedated June 2016. Trunked RadioI've written two introductory articles on how trunked radio works.You can read themherehere. Monitoring TETRAAn excellent tutorial on using a small, inexpensive software defined radioand Osmo-TETRA software to monitor Terrestrial Trunked Radio (TETRA)systems can be found here.Computer-savvy hobbyists may wish to experiment with using computer software to monitor digital radio signals. A popularpackage currently under development is Digital Speech Decoder (DSD).Download DSD and mpelib from this page.A good tutorial is available here.DSD requires an additional software package called Cygwin DLL that can be foundhere. Download and install the 32-bit version.Copy the cygwin1.dll file into the DSD directory.A basic introduction for Windows users is available here. Digital Speech Decoding PlusAn enhanced and somewhat more capable version of DSD appeared in December 2013, designed to operate under Windows.Download DSD+DSD+ requires the use of an audio software package that can encode MP3 audio files.Go hereto download an installation program. Run it and move the lame_enc.dll fileto the DSD+ directory. DMR DecodeA free and open source decoder for Digital Mobile Radio (DMR) is availablehere.Source code can be found here. APCO Project 25 Security Researchers based at the University of Pennsylvania have published an academicpaper describing some security weaknesses in P25. You can read the paper(in PDF format)here (local copyhere). A research group in Australia have analyzed the implementation of variousencryption-related functions in Project 25. Their research paper ishere(local copy here). APCO P-25 ScannersMonitoring APCO Project 25 systems requires a digital-capable scanner.Uniden is selling the SDS100 handheld and SDS200 base/mobilescanners. Both are capable of monitoring P25 Phase 1 and Phase 2 systems andare the first consumer-grade scanners based on software-defined radio (SDR)technology. The Whistler Group is selling the TRX-1 handheld andTRX-2 base/mobile scanners. These models are capable of monitoringP25 Phase I and Phase II as well as DMR, MotoTRBO and NXDN transmissions. Uniden is selling the BCD436HP handheld and BCD536HP base/mobilescanners. These units are capable of monitoring P-25 Phase I and Phase IIsystems and support Zip Code-based scanning, making programming quite easy. GRE is selling the PRO-18 scanner,which requires no user programming. Instead, the user manipulatesa simple, iPod-like front panel interface.Radio Shack is selling the PRO-18 scanner,a slightly less capable version of the GRE PSR-800. Uniden is selling the HomePatrol-1 scanner,which requires no user programming. Scanning is based on the entered zip code of the user. Uniden is selling the BC396XT scanner,which appears to be similar to the BC396T with the addition ofseveral features, including a bandscope, control channel data output,GPS location-based scanning and the ability to tracksystems that use ESK. Radio Shack is selling the PRO-106 and PRO-197 scanners,which are nearly identical to the GRE PSR-500 and PSR-600 models. GRE is selling the PSR-500 and PSR-600 scanners,capable of tracking APCO Project 25 systems (as well as other analogtrunked systems). Uniden is selling the BCD996T, a base or mobilescanner capable of tracking nearly all APCO P-25 systems, as wellas the common analog trunked systems. It has a unique capability ofaccepting external GPS position information and selectingappropriate frequencies to scan.More here. Uniden is selling the BCD396T, a compact handheldscanner capable of tracking nearly all APCO P-25 systems, as wellas analog trunked systems.More here.Radio Shack is selling the PRO-96, a GRE-built scannercapable of monitoring 3600-baud and 9600-baud trunked APCO P-25systems.More here.Uniden is selling upgraded digital scanners, theBC296D handheld and the BC796D base/mobile scanners.is capable of monitoring APCO P-25 systems, including thosewith 9600 baud control channels.More here.BC250D handheld and the BC785D base/mobile scanners, eachof which are capable of monitoring (some) APCO P-25 systems throughthe use of a plug-in BCi25D decoder card.More here. APCO P-25 DecodersAOR is selling the ARD25, an APCO P-25 decoder that uses the 10.7 MHz IFoutput of a separate receiver.More here.The National Oceanic and Atmospheric Administration (NOAA), under theauspices of the National Weather Service (NWS), operates more than 900transmitters broadcasting weather-related information on one of sevenVHF frequencies: 162.400 MHz 162.425 MHz 162.450 MHz 162.475 MHz 162.500 MHz 162.525 MHz 162.550 MHz Checkhere forcurrent status on any problems or outages.DecibelsRhone Schwartz has an excellent document, dB or not dB?, describing the fundamentals ofthe Decibel unit of measurement that is availablehere.Signal Propagation Propagation environment information from a variety of sources can be foundhere. NOAA maintains the Space Environment Center. Information about the Sun-Earth environment atSpaceWeather.com. Ham Radio magazine published a brief article on calculatingline-of-sight distance. You can see a scan of that article by clickinghere.Radio Teletype (RTTY) Real RTTY signals may once again be on the air, originating fromCalifornia (read about the stationhere).From an announcement Dated October 31, 2006:KSM, the coast station of the Maritime Radio Historical Society (MRHS),has been granted two RTTY frequencies by the FCC.The MRHS will use these channels for broadcasting weather, press and other information to the maritime community using RTTY (Baudot) and SITOR FEC modes.It will take a while for the MRHS Transmitter Department to bring transmitters on line for these frequencies. But now that we have FCC approval we can begin work on this new project. An announcement will be made when we are ready to begin transmission on these frequencies.You can read more about the Maritime Radio Historical Societyhere. As of 2003, "inadvertent" interception of cellular telephone calls is not illegal,at least according to the State Supreme Court.Read the reasoninghere. Information regarding the permit that used to be required for scanning froma vehicle in Michigan is availablehere. If you're interested in where the towers are located in Michigan's statewideAPCO 25 system, clickhere.McElroy Chart of Codes and Signals as picturedhere? Back in 1970 the magazine Popular Electronics publishedthis article about detectingchanges in local gravity using a CW receiver. Information about building a quadrifilar helicoidal antennacan be foundhere. Does anyone know when Motorola built a portable AM/FMradio with a model number of X70E? Some photos of the radiocan be seenhere. Rich Carlson, N9JIG, reviews three scanning magazines(Popular Communications, Monitoring Times, andScanning USA) on his websitehere.Interoperability The National Telecommunicationsand Information Administration has a set of recommendations for Federalgovernment radio frequency interoperability.The recommendationscan be found here.Spectrum Charts The National Telecommunicationsand Information Administration, Office of Spectrum Management,offers a nifty spectrum chart in PDF formathere, or youcan order a poster versionhere. You can download an Electromagnetic Radiation Spectrum Posterhere,or order a full-size print.

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