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P25 LSM (Linear Simulcast Modulation) Difficulties I've read that LSM uses CQPSK modulation; that it uses a pulse-shaping filter that is slightly different than the "standard"; that C4FM is used for the uplinks, LSM is used on the downlinks only; and that there is some controversy as to whether it should qualify as fully "APCO P25 compliant
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
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
Cell Tower Interference SDR Trunk - RadioReference. com Forums 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 cell tower was installed very close to my house (1000 feet) I’m now having problems with audio distortion ever since the new
SDS150: - New Uniden Scanner announcement at SEMA 2025 If I remember correctly, the 1st batch of SDS100's went quicker than this 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 performance are giving many a wait and see approach I am
Control Channel Modulation - RadioReference. com Forums After reading the postings in a state forum on control channel modulation regarding trunking sites astro25 9600 control channel modulation C4FM vs CQPSK I understand that simulcast sites are CQPSK(LSM) and ASR Astro Standalone Repeater fill in sites typically do not use simulcast? and are
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"
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