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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 simulcast system for a scanner to decode
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 . . . I was reading the responses you were getting over at APCO and they were good LSM looks like the way to go for what you are doing The engineering will be similar if it is UHF or VHF But this is the place where investing in a good professional consultant can be a good idea As R8000 said, this is a hobby radio site
SDRTrunk using RadioReference P25 Channel lists noob question 1 You only have to put in the 'c = control' frequency 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
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 tower was turned on
Commercial Radios That Do P25 Trunking Without Needing A System Key 2 Unication G4 G5 receiver: $$$ Works and sounds better on P25 LSM But software is free and no 'hacks' required 3 Relm KNG $$$$ Works and sounds great on P25 LSM Software is cheap, and no hacks required 4 Motorola $$$$$ Works and sounds great on P25 LSM Software can be a pain to get, and can only do RX-only with hacks
2024 FIRESCOPE Radio Communications Guide - RadioReference. com Forums I have even configured a single site LSM repeater on UHF to help with multipath due to the delay spread resistance This is a conventional UHF system in APX CPS R32: A P25 conventional frequency set in Harris RPM2 I can confirm both radios will not work on my LSM system if modulation is set to C4FM, even though it's supposed to be "compatible"
BCD325P2 BCD996P2: - P25 Threshold - RadioReference. com Forums It is also helpful (to some extent) on LSM (simulcast) systems, and can reduce breakup on many of those types of systems "AUTO Threshold" is not good to use because it will hunt for the modulation peaks and get very confused on weak signals and also on LSM systems That shortens range and causes unnecessary degradation
Simulcast Distortion - RadioReference. com Forums Now with Trunked LSM and TDMA the delay spread of the LSM messes up the older (BCD325P2, BCD996P2, TRX-1 2) scanners and TDMA is a little more "Digital" sounding, and does not help i use a BCD325P2 a BCD996P2 and use the attenuator and different antennas to get good P25 performance out of the old girls For great Trunking performance I use