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Analog narrow band coverage

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ASAD

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Hi all. I've been confused with conflicting information on range with WFM and NFM respectively. Assuming you are on UHF, would you get a longer range with wide or narrow band?

Thanks.
 

jim202

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Hi all. I've been confused with conflicting information on range with WFM and NFM respectively. Assuming you are on UHF, would you get a longer range with wide or narrow band?

Thanks.

Simple answer is your range will be reduced with narrow band operation.

Jim
 

mm

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Theoretically with a static bench test just if it was as simple as assuming a correlated sensitivity improvement just by narrowing the bandwidth then yes but when you start operating in an actual real world environment with fading and multipath considered then you will experience around a actual 3 db loss with 12.5 k analog channel as compared to 25 khz analog.

If you were to compare this 25khz analog channel to a 12.5 khz p25 signal you would experience a 5.9 db improvement over the 25 k analog which would be the baseline.

see the following link for a explanation on this.

LEIKHIM AND ASSOCIATES LLC - VHF-UHF Narrowbanding
 

12dbsinad

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Mar 15, 2010
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Theoretically with a static bench test just if it was as simple as assuming a correlated sensitivity improvement just by narrowing the bandwidth then yes but when you start operating in an actual real world environment with fading and multipath considered then you will experience around a actual 3 db loss with 12.5 k analog channel as compared to 25 khz analog.

If you were to compare this 25khz analog channel to a 12.5 khz p25 signal you would experience a 5.9 db improvement over the 25 k analog which would be the baseline.

see the following link for a explanation on this.

LEIKHIM AND ASSOCIATES LLC - VHF-UHF Narrowbanding
For all the analog systems i've been part of converting to narrow analog, never have I seen a 3 db degradation. If there is it usually means there is something wrong. Next time a salesman says that, ask them what a DB even is, most just follow a sales plan. 30-40 percent range loss is the normal advise given by salesman, right up there with having to purchase narrowband antennas and coax. All of which i'd find another vendor.
 
D

DaveNF2G

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Narrow band should give longer range. With a narrower passband, less noise can enter the path.

The question is academic in the USA as narrowband (the new definition) is now required.
 
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