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Analog narrow band coverage
- Thread starter ASAD
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- narrow band fm
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jim202
Member
kayn1n32008
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Wide band
prcguy
Member
Narrow band should have around a 3dB advantage if the the radio IF filters are exactly half the BW of the original WB filters and deviation is adjusted properly for narrow band.
prcguy
prcguy
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
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
Member
- Joined
- Mar 15, 2010
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- 1,953
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
Guest
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.
The question is academic in the USA as narrowband (the new definition) is now required.
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