BOBRR
Member
Hello,
For the NOAA weather broadcasts on, e.g., 162.5 MHz:
What is the correct mode ?
fm, or...?
Thanks,
R.
For the NOAA weather broadcasts on, e.g., 162.5 MHz:
What is the correct mode ?
fm, or...?
Thanks,
R.
Mode For NOAA Weather Broadcasts ?
- Thread starter BOBRR
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FM
FM
It might also be FM.
wtp
Member
- The FCC private land mobile radio narrowbanding rule does not affect the NOAA weather channels.
Narrowbanding - The RadioReference Wiki
from,
- The FCC private land mobile radio narrowbanding rule does not affect the NOAA weather channels.
Narrowbanding - The RadioReference Wiki
wiki.radioreference.com
Oh, so does that mean it is FM?
MStep
Member
It is "narrow-band" FM. In other words, if your radio also supports broadcast band FM, that would be the wrong mode. The weather frequencies use the same mode as you would use for non-digital police and fire stuff.
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Wait, only broadcast band uses FM, and commercial two way radios only use Narrow FM? Is this what you are saying @MStep ?
wtp
Member
it is the old FM and not narrow.
many years ago there was wideband FM used on TV audio and FM broadcast and the other was all FM
then they added narrow FM to kind of get more frequencies in use because you could have them closer together.
so now there is WFM, FM NFM (or FMN)
many years ago there was wideband FM used on TV audio and FM broadcast and the other was all FM
then they added narrow FM to kind of get more frequencies in use because you could have them closer together.
so now there is WFM, FM NFM (or FMN)
MStep
Member
Pretty much. If commercial or public service radios are not using a digital mode like DMR or NXDN, they are likely using narrow-band fm. Some of the more "professional" receivers have what is essentially a WBFM (wide-band FM) mode for listening to the FM broadcast band, and also have NBFM (narrow-band FM) for stuff like business radios and police and fire.
The AOR DV1 for example, allows you to select the appropriate bandwidth for your desired signal. What type of receiver(s) are you using?
From Google:
Narrowband FM is used for voice communications in commercial and amateur radio settings. In broadcast services, where audio fidelity is important, wideband FM is generally used. In two-way radio, narrowband FM (NBFM) is used to conserve bandwidth for land mobile, marine mobile and other radio services
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techman210
Member
Google fails again!😀
mmckenna
I ♥ Ø
It is FM.
NOAA weather radio uses 25KHz wide channels, 5KHz deviation, 16K0F3E modulation. Most consumer scanners used for public safety monitoring will refer to this as FM, or Wide FM.
Broadcast uses -really- W-I-D-E stuff, but not something you need to worry about with a consumer scanner.
Most LMR stuff above 150.1MHz and the UHF band, went 'narrow' band FM back in January of 2013. That's 12.5KHz channel width, 2.5KHz deviation, 11K0F3E modulation.
Really, it's FM.
NOAA weather radio uses 25KHz wide channels, 5KHz deviation, 16K0F3E modulation. Most consumer scanners used for public safety monitoring will refer to this as FM, or Wide FM.
Broadcast uses -really- W-I-D-E stuff, but not something you need to worry about with a consumer scanner.
Most LMR stuff above 150.1MHz and the UHF band, went 'narrow' band FM back in January of 2013. That's 12.5KHz channel width, 2.5KHz deviation, 11K0F3E modulation.
Really, it's FM.
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techman210
Member
And VHF Marine uses 16K0F3E bandwidth/emission. It’s exempt from the narrow banding mandate as is Weather radio transmitters, everything below 50 MHz, some MURS channels, 470-512 MHz, and GMRS and of course Ham radio.
Some of those Google results pull up web pages with lots of disinformation on them.
Some of those Google results pull up web pages with lots of disinformation on them.
IC-R20
LoBand Nation
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Overcomplicating it. The mandate was just for a limited range of services in 150-174 and 421-470. Wish there was more 25 kHz digital systems. I used to use an OpenSky 9600 repeater, 4 Slots on a single channel. It'd be neat to modify one for 33cm HAME keep an echolink and allstar for public dialing on one slot and the daily old man prostate rag chews on another out of the way slot along with the nets.
CrabbyMilton
Member
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Just for fun, I set the scanner to pick up NOAA in the AM mode. Sounded ok that way too. Perhaps the following scenario is no longer worth it thanks to the ability to look on your mobile device for weather. However, with traditional FM broadcast band isn't as popular given one can find music elsewhere, why not use some of those unused FM frequencies (due to stations that are defunct) rebroadcast NOAA Weather radio?
I know there are many factors here but I'm just being abstract and/or thinking from an earlier time.
I know there are many factors here but I'm just being abstract and/or thinking from an earlier time.
MStep
Member
Many folks use their specialized WX receivers to get programmed weather alerts. It's the quickest, most effective way of getting warning of an impending disaster. Perhaps not so much in major cities, but more so "out in the sticks", a weather-alerting radio can be an invaluable tool in saving lives. There are hundreds of thousands (if not millions) of these alerting-type radio across the United States.
CrabbyMilton
Member
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I agree with that. I'm not knocking those at all and I still have one from the mid 1980's that I keep on alert at all times. Mine obviously doesn't have the SAME technology and that never seems to work on the scanners I have had anyways but I digress. So I could be awakened to a sever thunderstorm watch in a county nowhere near me. Of course now things are different since I can look on my phone to see if anything is coming my way and if not...whatever.
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