- Mar 14, 2014
- In the Western US Mountains :)
Let me add a couple of comments to expand on what you have said. First and probably the least understood is the ability to program radios over the air. Normally called OTAR for "Over The Air Reprogramming". In theory this is a fine package to be had in your trunking system. Works great for one or two radios. Problem is that there isn't enough free data time on the control channel for a whole lot of this type of programming of a radio on an active trunking system. It could take as long as 30 minutes to program a radio if there is a large number of channels (talkgroups) in the radio. While the radio is being programmed over the air, it is dead to the user. You might as well go read a paper or have a meal. Think about trying to program a whole fleet of radios this way. Remember that the data channel is only 9600 BPS on a P25 system. Just how much data can you flow over that? Plus you have to maintain normal system operation and traffic while the radio is being programmed."Phase II is the P25 standard for narrow band communications." Um, so P25 P1 is wide band only?
"Unfortunately, P25 Phase I radios cannot be used on a P25 Phase II system, which means agencies that want to enjoy the benefits of Phase II must buy new radios." (Unless I'm mistaken) Technically true, but very miss-leading. They can be used, just all radios on the talkgroup will use P1. Almost sounds like it was written by Motorola.
"Designed for interoperability, the APX Dual mobile Radio operates on the 700 MHz and 800 MHz bands as well as VHF frequencies. This provides a single platform for police and fire radio interoperability. " Uhhhh, first, its any of two bands, and second, are they assuming that and police is on 7/800 and all fire on VHF? A dual band radio does not mean fire and LE can talk. What about (as many areas are) Fire and LE on the same band? What about TRSs? Never mind the fact that a dual band radio is useless if the operator is not trained, and does not have the right mindset.
I won't rant on the E word, but they talk about interop in the first part, then barely mention the issues that have to be addressed.
I am glad they make it clear that the smartphones apps were for office staff types only. They had me scared with visions of my local cops running around with Nextels.
"FirstNet systems will operate on Band 14 of the 700 MHz spectrum, which was previously used by VHF television signals." 700 is UHF, not VHF.
"That's not to say there aren't some benefits to broadband access on police radios. It's just that the benefits are not readily evident to the average officer." Ability to get rid of separate MDT modems? Have basic info pushed to the officers handheld, say, a mugshot? What about the camera mics Motorola is working on, where when the gun comes out of the holster, it activates that camera, and streams the video to the dispatcher?
"Broadband capability on police radios is very useful for radio programmers. Broadband is a larger pipeline, which means the radios can be programmed more efficiently. When you have to reprogram 4,000 radios, you can shoot out the reprogramming en masse similar to how the incremental computer operating system updates can be downloaded over broadband." POP25, Broadband not needed.
Am I been too harsh? I know it's a police site, not a radio site.
Let me add a couple of comments to expand on what you have said. First and probably the least understood is the ability to program radios over the air. Normally called OTAR for "Over The Air Reprogramming".
found this article in the police magazine, and found it has a lot of good information !?!?
Radios: Your Lifeline is Evolving - Article - POLICE Magazine
What do you think??
Yes. And to communicate, every agency in the location will have to be P25...if so much as one agency decides on a P25 system, while everybody else is Conventional Analog. State Operations / Emergency Services / Disaster coordiantion takes state and federal grants and builds a P25 system.....Unless agencys in that state go P25 alos......then no one......by two way analog radio...can talk to the State.One of the key goals of P25 was to make it easier for officers and other public safety personnel to communicate with each other. This goal was to be achieved through a uniform standard for digital public safety radios.
If I am not mistaken.....narrow banding was mandatory, as set forth by the FCC. So would that not make Phase 2 mandatory also? Here we go again......More money in the pockets of radio manufacturers. I am not sure.....But I think I smell lobbiest here ( Comms people lobbying the FCC for Narrowbanding ?? )Unfortunately, P25 Phase I radios cannot be used on a P25 Phase II system, which means agencies that want to enjoy the benefits of Phase II must buy new radios.
About a $6000 to $6500 dollar portable radio. Which is nice, and I know it is loaded with features. But unless you are an agency in Orange County, California - New York City - Austin, Texas...and you have a real nice budget to work with......the Unity is expensive. I can see where Harris radios and portables are needed....and I can see where they are not.The Unity XG-100P is a state-of-the-art multiband portable from Harris. It offers end-to-end encrypted digital voice communications and is P25 Phase II ready.
Some new portable police radios are now enabled for Bluetooth mics and there are a variety of products available to add Bluetooth to radios that don't have Bluetooth built in. [/QUOTE ]
:roll: Blue tooth. That is real security right there.
Ya think?Still, there is no universal acceptance of Bluetooth for mission critical communications.
Kenwood TK-5410D Phase 2 Portable Radio K3Kenwood's latest Phase II portable is the TK-5410D. It offers enhanced microprocessing for coverage of the entire 700 MHz and 800 MHz voice bands and MIL-STD 810 toughness. Some of the features include: 100 zones with 1,024 channels, a backlit dot matrix LCD, 16-character alphanumeric aliases, a three-digit sub-display, and several encryption keys.
$2,300.00 Thats a more reasonable price.
FF - Medic !!!
When I was in the Military.....overseas ; we used to send a signal, an ERF....to key up the SINGARS radios for the same "scan sequence" among other things. Is "OTAP" / "OTAR" possible, without another radio incidently / maliciously / accidentlly sucking up the programming information?OTAR is Over The Air Re-key used with a KMF to rekey encrypted radios with out having to touch ever radio
OTAP is Over The Air Programming
"ERF" stands for ECCM Remote Fill. Upon opening a frequency hopping net, the Net Control Station must electronically transmit some data to the net radios.