AM FM NFM WFM WFM Broadcast

[Tryton]

Hi all, I am still learning the whole freq thing.. What I need help with is basically what freq's use what Modulation? is there a chart anywhere that I can check?

example 220mhz - 270mhz am? or fm or...Well you get the picture..

Thanks for any input

Tryton

 

[gmclam]

I'm not sure about a chart, but here are a few basics.
- NTSC broadcast TV audio uses "wide" FM.
- Broadcast FM (88-108MHz) uses wide FM.
- The aircraft band (108MHz-136.975MHz) uses AM.
- Military aircraft band (225MHz-379.975MHz) uses AM.

Most everything else (but not all by any means) is FM. Now whether it is "narrow" FM or not depends on who's definition of narrow FM you're using. Some people would consider what we've used all these years for public safety to be narrow, because it is narrow compared to broadcast. But we have this new thing called narrow-banding coming which is splitting some channels/frequencies again. So the width of the channel depends on the band it is in (UHF, VHF high, etc), perhaps how long ago it was licensed, and the exact frequency (in some cases you know it is a narrow FM channel because of the number of places past the decimal point the frequency is carried out to).

 

[Tryton]

Thats exactly the info I was looking for! Thanks!!!

 

[JeremyB]

Here is how the ham bands are setup
http://www.arrl.org/FandES/field/regulations/bandplan.html

 

[eraweeb]

I'm not sure about a chart, but here are a few basics.
- NTSC broadcast TV audio uses "wide" FM.
- Broadcast FM (88-108MHz) uses wide FM.
- The aircraft band (108MHz-136.975MHz) uses AM.
- Military aircraft band (225MHz-379.975MHz) uses AM.

Most everything else (but not all by any means) is FM. Now whether it is "narrow" FM or not depends on who's definition of narrow FM you're using. Some people would consider what we've used all these years for public safety to be narrow, because it is narrow compared to broadcast. But we have this new thing called narrow-banding coming which is splitting some channels/frequencies again. So the width of the channel depends on the band it is in (UHF, VHF high, etc), perhaps how long ago it was licensed, and the exact frequency (in some cases you know it is a narrow FM channel because of the number of places past the decimal point the frequency is carried out to).

The Military Band also has some FM channels mixed in with it. Most good scanners will automatically switch the mode back and forth as you scan.

 

[Hoofy]

Here's a link to a chart that will show where the band splits are.. vhf,uhf, hf etc.

http://www.jneuhaus.com/fccindex/spectrum.html