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MURS Bandwidth Question

JoshuaHufford

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I just bought a set of MURS handheld radios. In the settings I can select either 20 kHz or 12.5 kHz bandwidth.

What are the advantages/disadvantages of either setting?
 

mmckenna

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Well, here's what the rules say:
(a) The occupied bandwidth of emissions transmitted on the center frequencies 151.820 MHz, 151.880 MHz, and 151.940 MHz must not exceed 11.25 kHz.
(b) The occupied bandwidth of emissions transmitted on the center frequencies 154.570 MHz and 154.600 MHz must not exceed 20.0 kHz.

Your radio should keep you inside those limits, as in it should not let you select 20KHz for the 151MHz frequencies.

For the 154MHz frequencies, you can run either one. The wider bandwidth may give you a bit better audio and a bit more range.
But, you should be running what ever the other radios you are talking to are running. Running the wrong deviation will result in distorted or quiet audio.
 

JoshuaHufford

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The wider bandwidth may give you a bit better audio and a bit more range.
That is what I thought but I didn't know if there was any other reason.

So it seems like there are 5 frequencies that repeat 3 times for a total of 15 channels. For instance 151.820 is repeated MURS 1-1 Murs 2-1 and MURS 3-1.

What is the reason for repeating the same frequency in 3 channels?
 

mmckenna

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I think it's so you can program the same channel with different CTCSS/DCS tones.
Exactly.
There's a few GMRS radio manufactures that do the same thing. Midland proudly touts a "50 channel" radio, and people fall for it because they think they are getting something other radios don't have. It's the same 22 frequencies loaded in more than once.

MURS only has those 5 channels. No more.
 

mmckenna

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Looks like it is setup to where you can only change the bandwidth on channels 4 and 5.
Good. That's the way it's supposed to be. I've seen enough shenanigans from the Chinese radio manufacturers where they ignore the FCC rules that it wouldn't have surprised me if they did.
 
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