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- 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
- 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
- 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
- 2024 FIRESCOPE Radio Communications Guide - RadioReference. com Forums
I have even configured a single site LSM repeater on UHF to help with multipath due to the delay spread resistance This is a conventional UHF system in APX CPS R32: A P25 conventional frequency set in Harris RPM2 I can confirm both radios will not work on my LSM system if modulation is set to C4FM, even though it's supposed to be "compatible"
- Commercial Radios That Do P25 Trunking Without Needing A System Key
2 Unication G4 G5 receiver: $$$ Works and sounds better on P25 LSM But software is free and no 'hacks' required 3 Relm KNG $$$$ Works and sounds great on P25 LSM Software is cheap, and no hacks required 4 Motorola $$$$$ Works and sounds great on P25 LSM Software can be a pain to get, and can only do RX-only with hacks
- What is simulcast? | RadioReference. com Forums
LSM (W)CQPSK can tolerate a much wider amount of delay with out losing the ability to decode(by real system radios) the data stream Simulcast radio systems very precisely control the phase of the RF signal to ensure that the RF emitted from each of the simulcast transmitters will arrive with before the maximum delay spread value, through out
- Conventional Simulcast - RadioReference. com Forums
I've noticed a lot of instances where a conventional P25 channel is LSM simulcast, but no indication is made of it in the DB or in some instances, the additional simulcast information has been removed after another person reviewed it, even though the information is still correct Trunked systems
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