# Checking noise levels?

**URL:** <https://discussions.flightaware.com/t/checking-noise-levels/93504>\
**Category:** ADS-B Flight Tracking\
**Created:** [July 3, 2024, 4:50pm UTC](https://discussions.flightaware.com/t/checking-noise-levels/93504 "2024-07-03T16:50:38Z")\
**Posts on this page:** 13\
**Page:** 1

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**Author:** ![Dirky123](https://sea1.discourse-cdn.com/flex019/user_avatar/discussions.flightaware.com/dirky123/32/122504_2.png) [@Dirky123](https://discussions.flightaware.com/u/Dirky123)\
**Post date:** [July 3, 2024, 4:50pm UTC](https://discussions.flightaware.com/t/checking-noise-levels/93504/1 "2024-07-03T16:50:38Z")

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Hi, I recently setup piaware on my linux host. It’s working but I want to see how much noise and other stuff I am picking up. I am a radio ham and operate on other bands 3-30Mhz, 145Mhz and 433Mhz (approx). Ideally I want to monitor the dump/sdr at the same time as I tx on other frequencies to see how much interference is being picked up.

My aerial is on a triplexer and is shared with a radio on 144Mhz.

So ideally something I can run that will display noise and good signals at the same time.  
Thanks  
Mike

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**Author:** ![abcd567](https://sea1.discourse-cdn.com/flex019/user_avatar/discussions.flightaware.com/abcd567/32/113769_2.png) [@abcd567](https://discussions.flightaware.com/u/abcd567)\
**Post date:** [July 3, 2024, 8:35pm UTC](https://discussions.flightaware.com/t/checking-noise-levels/93504/2 "2024-07-03T20:35:38Z")

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# [Spektrum - How-to Speedily Scan RF Noise in band 24MHz ~ 1800MHz](https://discussions.flightaware.com/t/spektrum-how-to-speedily-scan-rf-noise-in-band-24mhz-1800mhz/71231)

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**Author:** ![wiedehopf](https://sea1.discourse-cdn.com/flex019/user_avatar/discussions.flightaware.com/wiedehopf/32/114045_2.png) [@wiedehopf](https://discussions.flightaware.com/u/wiedehopf)\
**Post date:** [July 3, 2024, 9:06pm UTC](https://discussions.flightaware.com/t/checking-noise-levels/93504/3 "2024-07-03T21:06:31Z")

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> [@Dirky123](#):
>
> Ideally I want to monitor the dump/sdr at the same time as I tx on other frequencies to see how much interference is being picked up.

Just transmit for a minute and check graphs1090?

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**Author:** ![Dirky123](https://sea1.discourse-cdn.com/flex019/user_avatar/discussions.flightaware.com/dirky123/32/122504_2.png) [@Dirky123](https://discussions.flightaware.com/u/Dirky123)\
**Post date:** [July 3, 2024, 9:31pm UTC](https://discussions.flightaware.com/t/checking-noise-levels/93504/4 "2024-07-03T21:31:14Z")

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Thank you, I didn’t even know that existed but looks like just what I need.  
73  
Mike

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**Author:** ![abcd567](https://sea1.discourse-cdn.com/flex019/user_avatar/discussions.flightaware.com/abcd567/32/113769_2.png) [@abcd567](https://discussions.flightaware.com/u/abcd567)\
**Post date:** [July 4, 2024, 1:52am UTC](https://discussions.flightaware.com/t/checking-noise-levels/93504/6 "2024-07-04T01:52:53Z")

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## How to remotely access Dongle Plugged into RPi from Windows PC over TCP

## (1) [https://discussions.flightaware.com/t/spektrum/87174/2](https://discussions.flightaware.com/t/spektrum/87174/2)

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## (2) [https://discussions.flightaware.com/t/howto-run-ads-b-receiver-ais-receiver-on-same-rpi/85040/134](https://discussions.flightaware.com/t/howto-run-ads-b-receiver-ais-receiver-on-same-rpi/85040/134)

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**Author:** ![BobbyMhor](https://sea1.discourse-cdn.com/flex019/user_avatar/discussions.flightaware.com/bobbymhor/32/113314_2.png) [@BobbyMhor](https://discussions.flightaware.com/u/BobbyMhor)\
**Post date:** [July 5, 2024, 4:56pm UTC](https://discussions.flightaware.com/t/checking-noise-levels/93504/7 "2024-07-05T16:56:02Z")

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I’m happily using 40w on FT4 and FT8 and have the Flightaware (light blue) filter in line, check your Skyaware page whilst you are TX’ing and see if any planes ‘drop’ off.  
I could see the odd distant one drop off.  
I also use a basic filter I got from AliExpress which works too.  
Not scientific but hey, it worked for me.  
The advice given above is more reliable than what I did…  
73

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<div class="post-metadata">

**Author:** ![hbokh](https://sea1.discourse-cdn.com/flex019/user_avatar/discussions.flightaware.com/hbokh/32/116680_2.png) [@hbokh](https://discussions.flightaware.com/u/hbokh)\
**Post date:** [July 6, 2024, 11:26am UTC](https://discussions.flightaware.com/t/checking-noise-levels/93504/8 "2024-07-06T11:26:24Z")

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For some quick results, run this one-liner on your rpi:

```auto
grep -sh /run/{dump1090,dump1090-fa,readsb}/stats.json -e '' | jq '.last1min.local | ((.accepted | add), .strong_signals, .signal, .noise)' | xargs -n4 echo | awk '{printf "\nStrong message rate: %.3f\nSignal: %.1f\nNoise: %.1f\n", $(2) * 100 / $(1), $(3), $(4)}'

```

It will output something like this:

```auto
Strong message rate: 1.499
Signal: -10.2
Noise: -25.3

```

Make sure you have packages `jq` & `findutils` installed.

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<div class="post-metadata">

**Author:** ![abcd567](https://sea1.discourse-cdn.com/flex019/user_avatar/discussions.flightaware.com/abcd567/32/113769_2.png) [@abcd567](https://discussions.flightaware.com/u/abcd567)\
**Post date:** [July 6, 2024, 1:18pm UTC](https://discussions.flightaware.com/t/checking-noise-levels/93504/9 "2024-07-06T13:18:40Z")

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### _Click on Screenshot to See Larger Size_

 ![Screenshot_20240706_091527_Termux](https://us1.discourse-cdn.com/flex019/uploads/flightaware/original/3X/7/2/728a6d5777e0dbe51cd6573acc9e4c200b619e56.jpeg)

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<div class="post-metadata">

**Author:** ![wiedehopf](https://sea1.discourse-cdn.com/flex019/user_avatar/discussions.flightaware.com/wiedehopf/32/114045_2.png) [@wiedehopf](https://discussions.flightaware.com/u/wiedehopf)\
**Post date:** [July 6, 2024, 2:02pm UTC](https://discussions.flightaware.com/t/checking-noise-levels/93504/10 "2024-07-06T14:02:09Z")

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> [@hbokh](#):
>
> quick results

You’d look at last1min instead of total though?

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<div class="post-metadata">

**Author:** ![hbokh](https://sea1.discourse-cdn.com/flex019/user_avatar/discussions.flightaware.com/hbokh/32/116680_2.png) [@hbokh](https://discussions.flightaware.com/u/hbokh)\
**Post date:** [July 6, 2024, 4:24pm UTC](https://discussions.flightaware.com/t/checking-noise-levels/93504/11 "2024-07-06T16:24:42Z")

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> [@wiedehopf](#):
>
> You’d look at last1min instead of total though?

You’re right, way better. Fixed it in the original post.

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<div class="post-metadata">

**Author:** ![abcd567](https://sea1.discourse-cdn.com/flex019/user_avatar/discussions.flightaware.com/abcd567/32/113769_2.png) [@abcd567](https://discussions.flightaware.com/u/abcd567)\
**Post date:** [July 6, 2024, 7:32pm UTC](https://discussions.flightaware.com/t/checking-noise-levels/93504/12 "2024-07-06T19:32:56Z")

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### Using updated one-liner command, twice with a gap of 30 sec between them.

### _Click on Screenshot to See Larger Size_

 ![Screenshot_20240706_152917_Termux](https://us1.discourse-cdn.com/flex019/uploads/flightaware/original/3X/e/1/e123f650037f9cbd4d2f1b96a7ad551796bf78e9.jpeg)

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<div class="post-metadata">

**Author:** ![Dirky123](https://sea1.discourse-cdn.com/flex019/user_avatar/discussions.flightaware.com/dirky123/32/122504_2.png) [@Dirky123](https://discussions.flightaware.com/u/Dirky123)\
**Post date:** [August 8, 2024, 3:22pm UTC](https://discussions.flightaware.com/t/checking-noise-levels/93504/13 "2024-08-08T15:22:59Z")

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> [@hbokh](#):
>
> ```auto
> grep -sh /run/{dump1090,dump1090-fa,readsb}/stats.json -e '' | jq '.last1min.local | ((.accepted | add), .strong_signals, .signal, .noise)' | xargs -n4 echo | awk '{printf "\nStrong message rate: %.3f\nSignal: %.1f\nNoise: %.1f\n", $(2) * 100 / $(1), $(3), $(4)}'
> 
> ```

What sort of figures should I be looking for? Which is preferable?  
I seem to be getting like:-

```auto
Strong message rate: 9.934
Signal: -8.2
Noise: -23.4

```

Then 10 mins later

```auto
Strong message rate: 0.828
Signal: -9.8
Noise: -26.3

```

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<div class="post-metadata">

**Author:** ![system](https://sea1.discourse-cdn.com/flex019/user_avatar/discussions.flightaware.com/system/32/38558_2.png) [@system](https://discussions.flightaware.com/u/system)\
**Post date:** [August 8, 2025, 3:23pm UTC](https://discussions.flightaware.com/t/checking-noise-levels/93504/14 "2025-08-08T15:23:14Z")

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Closed on August 8, 2025, 3:23pm UTC

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