I have a BCD325P2 and BCD996P2. Please attach your programming file so we can take a look at it. The system is in the range of 769-774 MHZ. The main difference being that my displayed trace (s) would have two "center" open "windows" Dec 16, 2008 · I've read that LSM uses CQPSK modulation; that it uses a pulse-shaping filter that is slightly different than the "standard"; that C4FM is used for the uplinks, LSM is used on the downlinks only; and that there is some controversy as to whether it should qualify as fully "APCO P25 compliant Nov 22, 2013 · 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. Only the fixed network equipment, i. I’m now having problems with audio distortion ever since the new Sep 16, 2022 · After reading the postings in a state forum on control channel modulation regarding trunking sites astro25 9600 control channel modulation C4FM vs CQPSK. standalone is difficult to Apr 4, 2024 · Currently, we are in the process of transitioning to the P25 standard. Recently a new cell tower was installed very close to my house (1000 feet). Band plan should load automatically. Dec 3, 2023 · 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. I understand that simulcast sites are CQPSK(LSM) and ASR Astro Standalone Repeater fill in sites typically do not use simulcast? and are Oct 18, 2013 · If the system is simulcasted, then the linear repeaters employ CQPSK modulation, which Motorola calls "LSM" (Linear Simulcast Modulation). the GTR 8000 repeaters, transmit in CQPSK/LSM modulation. Our focus has turned toward understanding the implications of Continuous Four Frequency Modulation (C4FM) and Linear Simulcast Modulation (LSM) within VHF conventional simulcast systems. Someone in PA can give a more definitive answer. If the primary control frequency repeater goes down for some reason, the site will automatically start using one of the 'a = alternate' control Nov 8, 2024 · It is using LSM. Worth system isn't the most difficult type of Jan 2, 2025 · I have been monitoring a P25 Phase II LSM 700MHZ system for a few years now with a Airspy R2 with no issues. Apr 7, 2024 · 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. System type is P25 Standard. Worth simulcast system, but it was pointed out that the Ft. Since this is a simulcast site, use the 'LSM' (vs 'C4FM') option. The RRDB is a great tool, but sometimes simulcast vs. Both are prone to simulcast distortion. Apr 7, 2024 · 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. Use only 1 channel configuration. I didn't make any changes. Feb 2, 2020 · Use the P25 Phase 1 decoder. You can probably use just the single frequency input to start. Try turning on the attenuator to see if it helps. . e. 2.

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