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  • P25 C4FM vs CQPSK LSM - Listening to tell the difference
    If you're looking at getting a digital scanner, it can be difficult to tell what system support you need, especially making the decision between an SDS with its simulcast support or an older model without it The RRDB is a great tool, but sometimes simulcast vs standalone is difficult to
  • Exploring Continuous Four Frequency Modulation (C4FM) and Linear . . .
    Currently, we are in the process of transitioning to the P25 standard Our focus has turned toward understanding the implications of Continuous Four Frequency Modulation (C4FM) and Linear Simulcast Modulation (LSM) within VHF conventional simulcast systems
  • P25 LSM (Linear Simulcast Modulation) Difficulties
    [cross-posted from op25-dev] Locally we have a Motorola system that runs in the 800 MHz band and is believed to be running with LSM I have been having extreme difficulty in achieving correct symbol recovery from any of the channels in this system, even though the signal strength is very strong
  • LSM CQPSK Simulcast vs. Other Types - RadioReference. com Forums
    Does anyone know how to determine if a simulcast P25 system is LSM CQPSK or another type? There is a video showing the new BCD436HP scanner performing pretty well receiving the Ft Worth simulcast system, but it was pointed out that the Ft Worth system isn't the most difficult type of
  • C4FM vs CQPSK - Scan Behavior - RadioReference. com Forums
    The trace on the right is definitely CQPSK (or LSM) and that trace is similar to what I would be looking for on the Anritsu The main difference being that my displayed trace (s) would have two "center" open "windows"
  • RTL-SDR LSM trunking via OP25: audio sample - RadioReference. com Forums
    The recording (linked below) was taken from a local P25 LSM system using OP25 with a $20 RTL SDR stick No other hardware (besides the PC itself) was used
  • BCD325P2 BCD996P2: - Stumped on system | RadioReference. com Forums
    It is using LSM Please attach your programming file so we can take a look at it System type is P25 Standard Band plan should load automatically I have a BCD325P2 and BCD996P2 Both are prone to simulcast distortion Someone in PA can give a more definitive answer Try turning on the attenuator to see if it helps I didn't make any changes
  • P25 Linear Simulcast Modulation ASTRO - RadioReference. com Forums
    If the system is simulcasted, then the linear repeaters employ CQPSK modulation, which Motorola calls "LSM" (Linear Simulcast Modulation) Only the fixed network equipment, i e the GTR 8000 repeaters, transmit in CQPSK LSM modulation
  • 2024 FIRESCOPE Radio Communications Guide - RadioReference. com Forums
    I don't think I've seen it posted this year, but here's the 2024 FIRESCOPE Radio Communications Guide Some changes include OES 1A, 1B, 2A, 2B being renamed to OES V1-V4, and the individual USFS service nets appear to be consolidated shared between different forests Some local channels added
  • SDRTrunk using RadioReference P25 Channel lists noob question
    Use the P25 Phase 1 decoder Since this is a simulcast site, use the 'LSM' (vs 'C4FM') option 2 Use only 1 channel configuration You can probably use just the single frequency input to start If the primary control frequency repeater goes down for some reason, the site will automatically start using one of the 'a = alternate' control





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