700 mhz band change

[Baker845]

I been seeing info on other forums about changes in the band plan for 700 mhz???. Will this effet new scanners to trunk 700 mhz systems, and with firm ware up grades when they comes out, will that fix any problems for new scanner to trunk 700 mhz systems?

thanks

 

[SCPD]

There is going to be a lot of things start to happen on 700 mhz. But not much of it will be voice.
From the different proposals in front of the FCC right now, I suspect that you will see 700 become the data portion of public safety, and 800 become the voice portion. I have a feeling those worried about their scanners recieving 700 won't be wanting to listen to anything don't there anyway. Unless you miss the sound of your old dial-up modem making a connection to your old dial-up internet server.

 

[n4voxgill]

even with the portion set aside for wideband, that can carry voice along with data, there are still more channels for voice only in 700 than public safety has in 800 MHz.

 

[studgeman]

Yes it will affect the ability of scanners to trunk track, it is basically the same problem you have with 800 rebanding. In 700 the frequency to channel number mapping is changing. Hopefully the scanner makers will be able to flash the new 700 table in. Yes you will have something to listen to. Systems planned for the narrowband channels in 700 are P25 systems.

 

[n4voxgill]

the 700 MHz band is expanding. It will start one MHz below where all the digital scanners begin. If the scanners can't be updated to the new expanded channels then you mayl miss some or all of a system. If it just a voice channel in that portion then you would just miss what is on that channel(s). If it is the control channel down there then no trunk tracking.

 

[rdale]

There's a Wiki with plenty of info on the changes and a list of scanners that will be fine afterwards...

 

[n4voxgill]

as long as it was updated in the last two weeks, as the FCC just issued the order adding frequencies.

 

[Baker845]

With firmware upgrade on new scanners such as bcd-396t when ever that comes out will that fix problem?

 

[SCPD]

If the scanners can't be updated to the new expanded channels then you mayl miss some or all of a system.

The standard 700 mhz band plan for P25 actually exceeds the public safety band allocation in terms of channel coverage. Channels will change but the relationship between channel numbers and frequencies won't.

 

[DJ88]

There's a Wiki with plenty of info on the changes and a list of scanners that will be fine afterwards...

Are you referring to 700 or 800 MHz rebanding? I did a search for 700 MHz rebanding and came up with nothing pertaining to it.

 

[SCPD]

A good example of what's going to be on 700

Are you referring to 700 or 800 MHz rebanding? I did a search for 700 MHz rebanding and came up with nothing pertaining to it.

Type in CyrenCall in your browser. I think the address is cyrencall.com, but I'm not positive. One wireless broadband nationwide system on 700 mhz for all public safety, that agencies, federal and municipal, can access for data.

A nationwide network for public safety, using voice, as well as data for in-vehicle fax machines(building prints in the hands of the firemen on the way to the scene), streaming video to and from vehicles, fingerprint readers in the cars, etc. Some munincipalities already have touchless digital video recorders that automatically download the dashcam video to a server when the car get's within a mile or so of the station. Based upon what I see different companies submitting to the FCC for consideration, I think this is where 700 mhz is going, and even though there will be voice on 700, I don't think it's going to be in a form of modulation that your scanner can recieve.

 

[DaveNF2G]

Don't take the proposals by Cyren Call or any other commercial entity as gospel. These are suggestions. The FCC will ultimately decide what form any such network, if it is approved, will take.

 

[n4voxgill]

Thye FCC has already issued the 700 mHz order. There are existing 700 systems that will be forced to change frequencies. It would do nothing but cause confusion if we refer to that as rebanding, so lets try re-alignment. Anyyhow, the FCC order requires the succesful bidder for the D block of 700 to pay for the realginment. The order requireres that the equipment be under contract the 8-30-07 to receive payment. Of course that was last week. The FCC has said they will grant waivers on the payment if needed.

 

[studgeman]

OK here is the deal, If i get around to it, I will add to the wiki. diagrams included.

the 700MHz band is being "re-aligned." The public safety spectrum is being reshuffled and moved one MHz lower.

The origional PS block consisted of a block of Narrowband Repeater outputs 764-767, A block of Wideband Channels 767-773 and then a block of repeater outputs 773-776. Commercial Allocation from 776-794. Narrowband inputs 794-797 Wideband cahnnels 797-803 narrowband inputs 803 to 806.

The new plan consists of the wideband segment moved directly adjacent to the commercial D block 763-768; 1Mhz guard band 769-769; All the narrowband channels 769-775; 1MHz Guard Band (B-Block); A&C Commercial allocations 776-788; D Block (PS partnership) 788-793; Old PS wideband channels 793-798; 1 MHz guard band 798-799; Pubic Safety Narrowband Inputs 799-805; B-Block guard band 805-806.

What does this mean for scanner listeners? all your channel mappings are changing. Hopefully the 396t et al. are flashable for the new channel map tables.

You can expect the narrowband channels to be typical trunked radio systems and conventional interop/itinerant channels. Yes they are P25.

The Old wideband spectrum is essentially being combined with the commercial D block. It is expected that one phyiscal system will be built utilizing both the public safety and Commercial spectrum. If the system was built today, it would most likely utilize either CDMA/EVDO Rev. A or WiMax. The specific technology is negotiable.