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- 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
- 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 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
- 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
- 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)
- 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
- The bcd325p2 will not handle simulcast. - RadioReference. com Forums
I purchased the 325 after my city came from phase 1 to phase 2 LSM It would not handle the system I returned it for the 436hp, and despite all the new features I programmed it manually, it has a system mode called x2-tdma that the 325 doesn't have and this is the reason it will handle linear
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