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安裝中文字典英文字典辭典工具!
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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 simulcast system for a scanner to decode
- 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
- 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 . . .
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
- Loose (Open) Squelch Improves LSM (Simulcast) Reception
In recent studies, we've determined that the squelch setting can dramatically affect P25 decode quality, especially on Simulcast (LSM) sites For more background on Simulcast issues, see the wiki article with the caveat that it is not fully correct on the root cause of the problem Here is a
- C4FM vs CQPSK - Scan Behavior | RadioReference. com Forums
when analyzing P25 Phase I in basic C4FM 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" where the dwell time is more open
- 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
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