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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
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
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
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
C4FM vs CQPSK - Scan Behavior - RadioReference. com Forums Steve, The suggestion you received to set everything to CQPSK is sound advice and will always work regardless of the actual modulation in use However, the "Eye" (Datascope) patterns you posted are both that of CQPSK Linear Simulcast Modulation (LSM) Left: C4FM (FSK4) RIght: CQPSK (LSM)
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
2024 FIRESCOPE Radio Communications Guide - RadioReference. com Forums CQPSK (LSM) can be used for conventional as well and it helps solve some of the delay spread issues in simulcasting C4FM Motorola APX radios and Harris XL radios need to be accurately defined or they won't receive properly
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 If the primary control frequency repeater goes down for some reason, the site will automatically start using one of the 'a = alternate' control