Bbc Radio Sounds App Download !LINK!

All sounds are in MP3 format. Click on the title of each to play them. These sounds are public domain, and may be used by anyone. If you plan to use these for commercial purposes, please have the courtesy to give me credit as the source.

Motorola MDC-1200 - This is the most common form of unit ID found in public safety. This is either broadcast at the start or the end of a unit's transmission (or both, if you so choose to have it programmed that way). The user's radio can also be programmed to emit a tone on key-up (to remind the user to wait before speaking, as the unit's mic is not activated until the ID is sent). (Thanks Great-Dane & Vinnie!)

Bbc Radio Sounds App Download

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MDC-1200 Preamble - This added feature of the MDC signaling system is designed to allow a properly programmed radio to mute the ID signal part of the transmission. The raw burst of data tells the radio to mute the speaker audio for a pre-determined length of time (usually 400 or 500 ms). If the radio is programmed correctly, the end-user (or dispatcher) would not hear this sound at all, only the person's voice.

MDC-1200 Echo - This sound is most commonly heard in a police cruiser or ambulance cab. What you are hearing is the very end of the 'wait tone' echoing off the inside of the vehicle and being picked up by the mic. Also, there are several Motorola radios that emit an "ok" beep, just like a key press, when the PTT is used. Certain models of the Maxtrac's and 'Pro' series radios were famous for this.

MDC DOS - Data Operated Squelch is a feature on Motorola radios & repeaters that acts to block most of the sound of the MDC burst (when used at the end of a transmission), or all of the burst (when used at the start of a transmission). Functionality is heavily based on the settings of the radio matching across all radios in a particular fleet. NYPD is a known user of MDC DOS on their repeaters. (Thanks Victor!)

Alternate MDC-1200 - This is an alternate sounding form of MDC-1200 that was only used in the Saber & System Saber series of portable radios.This is what it sounds like when blocked by DOS. (Thanks Foxo & Matt!)

Motorola MDC Pre-tone - This is the sound Motorola radios can be set to emit to the user while the MDC burst is going out over the air. This is to warn the user to hold-off on speaking before the burst has completed. (Thanks Nathan!)

Kenwood FleetSync - FleetSync is a digital messaging & identification protocol developed by Kenwood that is used in their line of radios. It it quite similar to Motorola's MDC, but has many more capabilities. Thissecond sample is an example of what it would sound like if the feature would be used to send a unit-to-unit message, GPS location burst, etc... (Thanks to Rich, N2DLX)

Hytera HDC1200 - This is Hytera's version of Motorola's MDC1200. The HDC1200 system in Hytera radios is fully capable of decoding & displaying the data from Motorola radios, even though the two systems sound different over the air.

ZVEI Selective Calling - SelCall is an alternative to conventional PL/DPL systems that is still widely used in numerous places in Europe. The functionality is basically the same - if the user's radio is not programmed with the proper tone sequence, the radio will not un-mute the speaker. This is SelCall code used by theItalian Carabinieri & this one is by the Italian police. (Thanks Alberto!)

Motorola SECURENET - This is another Motorola analog encryption format that goes back as far as the MTS/MCS line of radios. It uses CSVD encoding & therecovered audio is 'tape recorder' quality at best. Most all users of SECURENET were using with DES-XL. (Thanks Brandon!)

Encryption on FDMA - This is what encryption sounds like on a radio capable of receiving FDMA P25 audio. This was recorded from a Motorola Type-II trunking system, but the sound will be similar on a Phase-I P25 system.

Encryption on TDMA - This is what encryption sounds like on a radio capable of receiving TDMA P25 audio. This was recorded from the new Berks County, PA 700MHz Phase-II trunking system. The audio appears to have more of a 'sweeping' sound, and is less 'guttural' than when used on FDMA.

Motorola ASTRO IMBE - This is Motorola's current ASTRO voice format offering. This type of emission is known as C4FM, and the technology in use is the IMBE (Improved Multi-Band Excitation) vocoder from Digital Voice Systems Inc. This is a much better sample of decoded audio from the Bucks County, PA 500 MHz trunk system. There are almost half a dozen manufacturers that produce radios that are capable of 'Conventional P25 Operation' now, so this signal format is no longer exclusive to Motorola. (Thanks Nick!)

ICOM D-STAR - This is the new digital audio format in use by the D-STAR amateur radio system. This is what you would hear if you came across a D-STAR repeater with a regular analog amateur radio. This is anAMBE vocoder that uses theGMSK modulation style (similar to the world-wide GSM cell phone standard).

DMR - DMR stands for Digital Mobile Radio, and it is an open standard created by the ETSI for professional mobile radio users worldwide. Motorola brought this technology to market in the US as MotoTRBO, but there numerous radio manufacturers producing equipment now. It is based on a 2:1 TDMA format that uses the AMBE+2 vocoder & a 4-level FSK waveform. There is now a substantial presence in amateur radio of this format. This is what the signal sounds like when used inTDMA mode through a repeater, andFDMA mode when used simplex (talk-around) mode. (Thanks to the N6DVA group, Jerry, & Nick for the audio!)

Motorola DTR - This is a digital format used by Motorola DTR-series personal/jobsite portable radios. It utilizes frequency-hopping spread-spectrum signal technology (VSELP audio at 11 hops per second) on the 900MHz band. It is near impossible to get a copy of the raw audio without a service monitor due to the FHSS signal. The Nextel off-network 'DirectTalk' technology is based off of this same design, but the two formats are not compatible.(Thanks Greg & Ray!)

Yaesu C4FM - This is the version of digital modulation Yaesu chose for their new 'System Fusion' amateur radios. This is an FDMA signal format using the AMBE+ codec & is not compatible with C4FM P25 radios.Here is a sample of the decoded audio. (Thanks Greg & Bob!)

Motorola SmartZone OmniLink Control Channel - In the last few months of 2006, the NJSP completed an upgrade to the statewide trunked radio system. They upgraded the 3 separate SmartZone system in to one seamless OmniLink setup. Users from any part of the state can now leave their radios turned to their primary home talkgroup, and the system will follow them, even if they cross system boundaries. The upgrade seems to have added some interesting characteristics to the sound of the data stream.

APCO Project-25 Control Channel - Project-25 trunking is a completely digital, vendor-independent specification that was initially developed by Motorola, and now has product offerings & support from Harris, Kenwood, EF Johnson, & others. The original Phase-I systems are deployed as C4FM or CQPSK-LSM (Compatible Quadrature Phase Shift Keying - Linear Simulcast Modulation) if sent at a 12.5 KHz spread. If the system is set at the new 6.25 KHz spacing, it is just known as CQPSK. This is a 9600 baud data stream, and is what a Motorola-built Phase-I (C4FM) system sounds like.

P25 Test Patterns - These are a pair of data streams submitted by the same user as the sounds above. Neither was able to be decoded as a control or voice transmission. Any help in identifying what these are is greatly appreciated! -700MHz test transmission - 800MHz test transmission.

EDACS 'Jingle' - This sound was implemented by GE as a way for engineers & techs to be able to confirm the 'Channel Drop Message' had been properly sent by the radios in the system when monitoring on a standard analog receiver. Actual EDACS radios receive the CDM digitally & don't rely on the sound that's heard over the air. (Thanks Greg & Mark!)

Harris OpenSky - This is the latest technology system to come out of Harris. This system is basically a wide-area 'computer network'. Every radio has an IP address, and the mobiles can fully support voice & data simultaneously (i.e. - an officer's MDT). This system utilizes the AMBE vocoder (similar to the ICOM D-STAR system), and transmits over a 4:1 TDMA broadcast format. The fundamental design of this system is completely different compared to a Motorola or EDACS system - They use their control channel to tell units on the system to switch to different voice frequencies for reception of radio traffic. OpenSky sends the voice component back over the same stream that carries the control data. This sample came from the Pennsylvania state-wide system. There is currently no form of receiver that can decode this system. Thanks to an anonymous user, we now have an audio clipof what the format sounds like to the end-user (via a Harris M7200 mobile radio)!

Harris OpenSky Scene of Incident Mode - Harris SOI is an off-network 2-slot single site OpenSky repeater that is not connected to the main OpenSky network. Typically it's a trunk mounted system consisting of a mobile radio unit, control head, vehicular tactical repeater (V-TAC) and an RF combiner. It can be used at major events to alleviate traffic on the main system or anytime its use is desired. Here is what it sounds like decoded by a end-user's radio. (Thanks R Gromek!)

Kenwood NEXEDGE Narrowband Control Channel - This is the control channel used by Kenwood's version of NXDN in the 4800 baud (6.25k) trunking format. This trunking mode is incompatible with the Icom IDAS NXDN radios (they have their own version of trunking called MULTITRUNK). (Thanks Nick!)

TETRA - This is a highly successful trunking radio network design used outside the USA in many European, Asian, & South American countries. It is a 4:1 TDMA system that is primarily deployed at 380MHz and above. A well-written description of the system can be foundhere, and an audio sample is now available of what it sounds like to the end-user (DMO mode - non-repeated). The NJ Transit corporation has replaced their old analog Motorola Type-IIi trunking system with a PowerTrunk TETRA system, and data streamsounds noticeably different then the European version. Here is asample of the 390MHz PowerTrunk system that was deployed in 2021 for Ciudad Jurez in Mexico. (Thanks Roland, Greg & Augy!) ff782bc1db