So I've heard many things about "apco-25" being ready this year.....oh now it's ready next year !!!!!!
does anyone realy know if one can me made with out violating the patent ??? if there is one ????
Mike
Apco-25 scanner ??????
Moderator: Queue Moderator
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Elroy Jetson
- Posts: 1158
- Joined: Mon Sep 03, 2001 4:00 pm
I'm quite sure that Uniden will eventually make an Apco-25 trunking scanner, since they make two way products that have that technology.
If you want to speed things along, though, you could contact DVSI, inc. and ask them about licensing the chipset technology, provided that you have some highly able engineers who are willing to work on the problem, and enough money to get the job done. It wouldn't be cheap.
The problem is that this is technically a VERY sophisticated and complex system. It's FAR beyond the scope of any radio and RF hobbyist unless they design chips and/or complex digital communications systems for a living in their day job.
The days of the homebrewed scanner are just about over. The most you can hope for is to mod an existing one to make it work a little better. These days, the mods are probably better done in software than hardware, anyway.
Oh well, it was fun while it lasted.
Elroy
If you want to speed things along, though, you could contact DVSI, inc. and ask them about licensing the chipset technology, provided that you have some highly able engineers who are willing to work on the problem, and enough money to get the job done. It wouldn't be cheap.
The problem is that this is technically a VERY sophisticated and complex system. It's FAR beyond the scope of any radio and RF hobbyist unless they design chips and/or complex digital communications systems for a living in their day job.
The days of the homebrewed scanner are just about over. The most you can hope for is to mod an existing one to make it work a little better. These days, the mods are probably better done in software than hardware, anyway.
Oh well, it was fun while it lasted.
Elroy
Ok hopefully i don't get myself in strife or you guys but what about the case that was on the earlier styled forums about actually using Apco25 capable equipment for the same task?
For eg the motorola's have that sort've an hmm how can i say open mode in digital encryption setup in the RSS.
I gather due to the previous comments and realising the complexity of the whole design
chances are this isn't possible either?
Otherwise everyone and his dog would've tried it by now?
For eg the motorola's have that sort've an hmm how can i say open mode in digital encryption setup in the RSS.
I gather due to the previous comments and realising the complexity of the whole design
chances are this isn't possible either?
Otherwise everyone and his dog would've tried it by now?
Cheers and beers from the land of Oz!
Dave, earlier in the year I wrote to Uniden and asked them when the scanner would be ready. The official Uniden reply was: Uniden is only "exploring" the "idea" of building an APCO 25 scanner and ever since the MRT article they have gotten several questions and issues and currently don't have a build date or a release date for any such scanner.
I heard M is working on a High End (which means over priced) proffessional receiver with Apco 25 capatability. Before all this stuff happened in Ny an FDNY fireman I talk to told me they were told they would be able to get a digital reciever for each station in a year or so. I don't know if this is true or not, but it would make sense to build a Plectron type reciever for fire-ems stations and the press. FDNY dispatches were still analog before all the problems, is this because they didn't have a digital receiver in each station?
Howard
I heard M is working on a High End (which means over priced) proffessional receiver with Apco 25 capatability. Before all this stuff happened in Ny an FDNY fireman I talk to told me they were told they would be able to get a digital reciever for each station in a year or so. I don't know if this is true or not, but it would make sense to build a Plectron type reciever for fire-ems stations and the press. FDNY dispatches were still analog before all the problems, is this because they didn't have a digital receiver in each station?
Howard
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Elroy Jetson
- Posts: 1158
- Joined: Mon Sep 03, 2001 4:00 pm
I assume you're looking at test equipment that has Project 25 support? Well, Motorola's newest and fanciest service monitors also have P25 support, of course. Yes, that'd be an expensive way to do it, but it'd certainly be one heck of a nice device to have. But who wants to blow forty grand on a scanner?
In reference to an earlier post, you don't have to hint at the Digital Carrier Squelch option in the RSS, available on CAI radios. It's common knowledge and no secret at all. Heck, it's listed in the RSS manual!
Elroy
In reference to an earlier post, you don't have to hint at the Digital Carrier Squelch option in the RSS, available on CAI radios. It's common knowledge and no secret at all. Heck, it's listed in the RSS manual!
Elroy
No.
Miniport Receiver EB200 is a miniaturized portable professional receiver for the HF-VHF-UHF range. The EB200 is characterized by high input sensitivity and frequency setting accuracy throughout the frequency range from 10 kHz to 3 GHz.
Its small dimensions – ½19" in size corresponds to two height units – and low weight as well as a sturdy, pickup-proof die-cast aluminium housing with well-protected integrated operating elements make the EB200 ideal for use in places which cannot be reached with a vehicle. Its low power consumption permits battery operation typically of four hours. The EB200 battery pack is easily accessible and can be exchanged quickly. In case of power supply interruption, all the data are stored. Operation can thus be resumed immediately after the power supply is restored.
EB200 fulfils the following tasks:
Monitoring of given frequencies, eg storage of 1 to 1000 frequencies, squelch setting, constant monitoring of one frequency or cyclical scanning of several frequencies
Searching in a frequency range with freely selectable start and stop frequency and step widths of 1 kHz to 9.999 MHz
Location of close-range to medium-range targets with the aid of Hand-held Directional Antenna HE200
Detection of undesired emissions including pulsed emissions
Detection of unlicensed transmitters communicating illegally or interfering with licensed transmission
Protection against tapping by detecting miniature spy transmitters (bugs)
Monitoring of one's own radio exercises in a service band
Monitoring of selected transmissions
Remote-controlled operation via modem and PC
Decodes IMBE etc..
Nick
Miniport Receiver EB200 is a miniaturized portable professional receiver for the HF-VHF-UHF range. The EB200 is characterized by high input sensitivity and frequency setting accuracy throughout the frequency range from 10 kHz to 3 GHz.
Its small dimensions – ½19" in size corresponds to two height units – and low weight as well as a sturdy, pickup-proof die-cast aluminium housing with well-protected integrated operating elements make the EB200 ideal for use in places which cannot be reached with a vehicle. Its low power consumption permits battery operation typically of four hours. The EB200 battery pack is easily accessible and can be exchanged quickly. In case of power supply interruption, all the data are stored. Operation can thus be resumed immediately after the power supply is restored.
EB200 fulfils the following tasks:
Monitoring of given frequencies, eg storage of 1 to 1000 frequencies, squelch setting, constant monitoring of one frequency or cyclical scanning of several frequencies
Searching in a frequency range with freely selectable start and stop frequency and step widths of 1 kHz to 9.999 MHz
Location of close-range to medium-range targets with the aid of Hand-held Directional Antenna HE200
Detection of undesired emissions including pulsed emissions
Detection of unlicensed transmitters communicating illegally or interfering with licensed transmission
Protection against tapping by detecting miniature spy transmitters (bugs)
Monitoring of one's own radio exercises in a service band
Monitoring of selected transmissions
Remote-controlled operation via modem and PC
Decodes IMBE etc..
Nick
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Elroy Jetson
- Posts: 1158
- Joined: Mon Sep 03, 2001 4:00 pm
Follow up.
Another high end receiver (start saving)!
Detection, Decoding/Demodulation of Improved and/or Advanced Multi Band Decoding
(IMBE and AMBE) is available with the Rohde & Schwarz Automatic Modular
Monitoring of Signals (AMMOS) System.
AMMOS is based on VXI Receivers (HF; V/UHF) and digital signal processing (DSP)
boards produced by R&S.
AMMOS
EM010 HF VXI Receiver
EM050 V/UHF VXI Receiver
GX400DP VXI DSP Board
For Radiomonitoring of IMBE, the EM050 and GX400DP would be required. The
GX400DP is fitted with 18 Sharc DSP cards and provides computing power in excess
of 2GFlOps!
Another high end receiver (start saving)!
Detection, Decoding/Demodulation of Improved and/or Advanced Multi Band Decoding
(IMBE and AMBE) is available with the Rohde & Schwarz Automatic Modular
Monitoring of Signals (AMMOS) System.
AMMOS is based on VXI Receivers (HF; V/UHF) and digital signal processing (DSP)
boards produced by R&S.
AMMOS
EM010 HF VXI Receiver
EM050 V/UHF VXI Receiver
GX400DP VXI DSP Board
For Radiomonitoring of IMBE, the EM050 and GX400DP would be required. The
GX400DP is fitted with 18 Sharc DSP cards and provides computing power in excess
of 2GFlOps!
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Elroy Jetson
- Posts: 1158
- Joined: Mon Sep 03, 2001 4:00 pm
If you're serious about homebrewing an IMBE scanner, I might have something useful.
I've got a pile of GEOTEK mobile radios (an extinct company) that have what I'm pretty sure is an IMBE vocoder in them. I ran the patent numbers and one of them makes reference to an improved version of the MBE vocoder....! The radios are 900 MHz digital FHMA (Frequency Hopping Multiple Access) trunking mobiles with GPS-based AVL option boards in them as well. (I'm 90 percent sure the AVL option is GPS based, anyway...)
The control head is VERY cool and I've got something like thirty complete systems. I'm trying to see if I can get some info on programming hardware and the software to program them. Nextel bought the company's carcass so technically they have the rights. But since the system type is history, getting the software with permission may not be hard if I can find the right guy to talk to at Nextel.
These units may be for sale, shortly. Anyone who's interested, let me know.
Be warned, this would NOT be a trivial project. Advanced, for sure.
Elroy
I've got a pile of GEOTEK mobile radios (an extinct company) that have what I'm pretty sure is an IMBE vocoder in them. I ran the patent numbers and one of them makes reference to an improved version of the MBE vocoder....! The radios are 900 MHz digital FHMA (Frequency Hopping Multiple Access) trunking mobiles with GPS-based AVL option boards in them as well. (I'm 90 percent sure the AVL option is GPS based, anyway...)
The control head is VERY cool and I've got something like thirty complete systems. I'm trying to see if I can get some info on programming hardware and the software to program them. Nextel bought the company's carcass so technically they have the rights. But since the system type is history, getting the software with permission may not be hard if I can find the right guy to talk to at Nextel.
These units may be for sale, shortly. Anyone who's interested, let me know.
Be warned, this would NOT be a trivial project. Advanced, for sure.
Elroy