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- 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
- 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
- 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"
- 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
- 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
- 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
- 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
- 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
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