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  1. Exploring Continuous Four Frequency Modulation (C4FM) and …

    Apr 4, 2024 · 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 …

  2. SDRTrunk - MEMPHIS PD SDR TRUNK | RadioReference.com Forums

    Dec 16, 2025 · Are you trying to listen to the Memphis tower (LSM) and the Shelby Simulcast tower (LSM), or just one of them. If just one, which one? Memphis tower will require 3 dongles …

  3. P25 C4FM vs CQPSK/LSM - Listening to tell the difference

    Apr 7, 2024 · 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 …

  4. Cell Tower Interference / SDR Trunk - RadioReference.com Forums

    Jan 2, 2025 · I have been monitoring a P25 Phase II LSM 700MHZ system for a few years now with a Airspy R2 with no issues. The system is in the range of 769-774 MHZ. Recently a new …

  5. SDS150: - New Uniden Scanner announcement at SEMA 2025

    Oct 22, 2025 · Yeah, when the SDS100 came out we were anxious to solve the LSM problem. Most purchases of the SDS150 are probably upgrades, so the price and uncertainty of …

  6. C4FM vs CQPSK - Scan Behavior - RadioReference.com Forums

    Dec 3, 2023 · 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) …

  7. SDS150: - New Uniden Scanner announcement at SEMA 2025

    Oct 22, 2025 · When there, the HP2 can receive the local LSM on 700/800 MHz pretty well off the mobile antenna. The SDS100 is deaf using just the OEM rubber duck antenna. First time that …

  8. BCD325P2/BCD996P2: - Stumped on system | RadioReference.com …

    Nov 8, 2024 · 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 …

  9. Control Channel Modulation - RadioReference.com Forums

    Sep 16, 2022 · After reading the postings in a state forum on control channel modulation regarding trunking sites astro25 9600 control channel modulation C4FM vs CQPSK. I …

  10. VIPER Statewide Radio System Discussion - RadioReference.com …

    Jan 2, 2019 · It will be used mainly for LSM local to me. My county's system, and a local regional system. I want something to replace my SDS100 for LSM. I am very disappointed in the user …