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Is ≤2dB a good noise figure for an amp or should I get one that has less noise?

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F-Squared
Posts: 70
Joined: Mon May 27, 2019 12:16 pm

Is ≤2dB a good noise figure for an amp or should I get one that has less noise?

Post by F-Squared » Wed Aug 14, 2019 7:46 pm

The antenna it came with also has a noise figure of ≤3dB. Not sure if that includes the amp's noise or not Is that good or should I get an antenna that has less noise?

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Last edited by F-Squared on Wed Aug 14, 2019 7:46 pm, edited 2 times in total.



km1125
Posts: 62
Joined: Thu Mar 14, 2019 3:09 pm

Re: Is ≤2dB a good noise figure for an amp or should I get one that has less noise?

Post by km1125 » Thu Aug 15, 2019 12:41 pm

There shouldn't be a "noise figure" on the antenna unless it's got active components in it.



k8jd
Posts: 363
Joined: Fri Jun 28, 2013 3:35 pm
Location: Commerce, MI

Re: Is ≤2dB a good noise figure for an amp or should I get one that has less noise?

Post by k8jd » Thu Aug 15, 2019 8:08 pm

Is the 3 DB an ANTENNA GAIN figure ??
Depends what freq range you are on and what is the signal that you are listening for ??



F-Squared
Posts: 70
Joined: Mon May 27, 2019 12:16 pm

Re: Is ≤2dB a good noise figure for an amp or should I get one that has less noise?

Post by F-Squared » Thu Aug 15, 2019 9:39 pm

k8jd wrote:Is the 3 DB an ANTENNA GAIN figure ??
Depends what freq range you are on and what is the signal that you are listening for ??
Nope, it's the noise figure of it.

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F-Squared
Posts: 70
Joined: Mon May 27, 2019 12:16 pm

Re: Is ≤2dB a good noise figure for an amp or should I get one that has less noise?

Post by F-Squared » Thu Aug 15, 2019 9:39 pm

km1125 wrote:There shouldn't be a "noise figure" on the antenna unless it's got active components in it.
Maybe because of the LTE and FM filters?

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km1125
Posts: 62
Joined: Thu Mar 14, 2019 3:09 pm

Re: Is ≤2dB a good noise figure for an amp or should I get one that has less noise?

Post by km1125 » Fri Aug 16, 2019 9:39 am

There shouldn't be a "noise figure" on a passive device. By definition it's the noise that's introduced and added by the device to the incoming signal.

If it includes some type of active components, like a preamp to overcome the loss in a filter (like an LTE or FM filter) then it would make sense.



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