Narrowband
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DPD1
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I recall a few people reporting the new ones being used on rare occasion in a few places. I forget where exactly.
Dave
www.DPDProductions.com
Makers of the "TrainTenna" Rail Radio Band Antenna
Dave
www.DPDProductions.com
Makers of the "TrainTenna" Rail Radio Band Antenna
DODGEIT
Member
The railroads have until January of 2013 to replace any radios that are not narrowbanded. It doesn't mean that they have to use the new narrowband frequencies just then but they have to be ready to use them. Most radios sold to the railroads in the last few years already meet this new standard. Narrowbanding is the narrowing of the gap or spread in frequencies between channels. The link below provides a graph that explains this somewhat. http://wireless.fcc.gov/services/plmrs/images/vhfband.jpg
With railroads going to more data and train control systems they will need extra frequencies to do this.
With railroads going to more data and train control systems they will need extra frequencies to do this.
I got the opportunity to look at a programming file for BNSF's new ht's and they're programming narrowband.
My new HT is narrowband capaible.
We have some locomotive radios that have all the new channels. I remember typing in 1-7-3-1-7-3 and the radio accepted it.
Tim K.
Tim K.
IrvingtonVFD43
Member
In order to talk to Sioux City Yardmaster, we must dial in 175-175 into the Moto upon passing Homer Ne. for yarding instructions. Only narrowband I know of over the BNSF, but it has been reported BNSF Sioux City is testing P25 also.
I can see it now, some of these old heads replacing their 8 channel moto HT's...
Like teaching grandma how to use the internet.
Just to avoid confusion, "narrow band" simply means less than standard frequency deviation so a signal occupies less bandwidth. "Narrow banding" seems to have clouded the issue so the crux of it is by narrowing the signal they're able to create new channels (having 4 digits after the decimal point) in between the standard assignments thus doubling the number of channels available in any given band. For what it's worth the process started decades ago and we used to call them "splinter channels".
BigC801
Member
O man i even hate that word "Nexterna" they suck bad!!!!!!!!!!
csxfanimrkva
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Sources close to me in the RR have CSX using/testing the narrow band around certain areas.
Don't those nexterna's have an adjustable squlech? What is bad about them? Maybe they are using a lower quality antenna? Those firecracker antenna's arn't the best in world either. I had my car next to a locomotive once, I could hear a train getting a warrant, I was picking up both sides of the convo, while the locomotive was only hearing the dispatcher.
What is there to test? It is proven that is works, they have been using it for a few years now in other industries.
Here is an interesting site that talks about the future AAR Channel plan after 2013.
http://www.dpdproductions.com/page_rrfreqs_newplan.html
Makes for some interesting reading.
73s
Ron
http://www.dpdproductions.com/page_rrfreqs_newplan.html
Makes for some interesting reading.
73s
Ron
Astro25
Member
I suppose there isn't much use in replying to the thread... the OP's question has been answered, and he's been banned.
Allan_Love_Jr
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There is alot of talk going around in Railscan Yahoo Group that the CSXT is testing out there P25 Digital system.
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