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P25 Radio Systems - dvsinc.com
http://www.dvsinc.com/papers/p25_training_guide.pdf
In P25 digital mode, the P25 transmitter will convert all analog audio to packets of digital information by using an IMBE™ vocoder, then de-vocode the digital information back to analog audio in the receiver.
P25 audio decode level adjustment - The RadioReference …
https://wiki.radioreference.com/index.php/P25_audio_decode_level_adjustment
P25 Waiting Time - (In the Conventional systems and Motorola System/Site menus) On channels that contain a mix of analog and digital voice (i.e., where the Audio Mode is set to All), it is possible to have false decode problems caused by digital noise at the beginning of transmissions. To prevent this, a user-configurable P25 wait time (default 400ms; 0 to 1000 …
LMR AND THE P25 SUITE OF STANDARDS - Project 25
http://project25.org/images/stories/ptig/docs/Technical_Documents/LMR_P25Standards_ProductBulletin.pdf
P25 Phase 1 uses the proven FDMA technology that is well understood and extremely reliable P25 Phase 2 uses reliable QPSK modulation for the downlink and a compatible CPM technology for the uplink, allowing efficient reuse of Phase 1 user-device RF “front ends.” P25 is an open standard that allows manufacturers to easily license patented
RTL-SDR Tutorial: Decoding Digital Voice (P25, DMR, …
https://www.rtl-sdr.com/rtl-sdr-radio-scanner-tutorial-decoding-digital-voice-p25-with-dsd/
Also ensure virtual audio cable or VB-cable is set as the default recording audio device in windows sound properties as DSD will use the default sound device. If you are unfamiliar with what a digital voice signal may look like, two waterfall examples are shown below, with audio examples recorded in NFM mode. P25
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