Added filter. Gained flights on FR24, dropped on flightaware

How did the Airnav SAW filter perform for you?

I have not used it for actual reception, but have tested it. Please see this post:

But that’s the interesting bit :stuck_out_tongue_winking_eye:

The scans won’t adequately show the attenuation of the pass band :frowning:

OK, replaced FA Light Blue 1090 Filter by RB24 1090 Filter.
All other things (hardware / software / --gain 48) remain same.

FA 66cm 1090 Atenna in window >> 30 cm RG316 pigtail >> 1090 Filter >> FA ProStick Plus >> 1 m USB extender cable >> OrangePiPC

FA Filter: Up to 17:40 EDT
RB24 Filter: From 17:40 to 18:20 EDT
FA Filter: From 18:20 EDT to End of graph

Can’t argue that it’s more insertion loss.

But the way some people said it was resulting in way less aircraft … seems exaggerated.

Anyhow that’s how it is with filters … if you don’t REALLY need them, they often are not an improvement.

My case is exactly opposite.
I see almost negligible aircraft when I remove filter and connect antenna directly to the ProStick Plus:

Every time I removed and inserted the Filter, I made sure that all connectors are fully tightened, so the drastic drop is not due to loose connection. Actually I have several Cell/Mobile phone companies antennas on my building as well as adjuscent buildings, which causes overload of the LNA of ProStick Plus, and its SAW chip being located after the LNA, cannot protect the LNA from overload.

I hope in next version of Pro Stick Plus which is due to be released shortly, they will either relocate the SAW filter between LNA and input SMA connector, or may be add one more SAW between SMA connector and LNA. Let us wait and see.

  1. Up to 21:20 EDT > Antenna connected to Pro Stick PLUS through FA Light Blue Filter

  2. From 21:20 to 21:50 EDT > Antenna connected to Pro Stick PLUS directly (Filter removed).

  3. From 21:50 to 22:00 EDT > Antenna connected to Pro Stick PLUS through FA Light Blue Filter

  4. From 22:00 to 22:25 EDT > Antenna connected to Pro Stick PLUS directly (Filter removed).

  5. From 22:25 EDT to end of graph > Antenna connected to Pro Stick PLUS through FA Light Blue Filter






Agree 100%

I was using the dark blue FA filter for a while with the same or different gain settings.
Results i observed

  • Slightly decreased range (in the graphs1090 visible)
  • Slightly decreased message rate, even with highest gain
  • Time of appearance of departure aircraft from FRA later
  • Overall performance (FA stats) without significant difference

That’s why i removed the filter again.
So it’s really recommended to test it and not trust in the frequency scans only

5-10 Minutes of testing is not giving you a real picture how it performs. From my experience in the last weeks it needs at least a comparable day (e.g. weekday to weekday) to identify the potential changes.

Lol did you look at the graphs?
His interference is so bad he basically looses all traffic if the ProStickPlus doesn’t have an extra filter in front of it.

It was more a general statement, i agree on his stats, but wanted to avoid that others are following the same approach in general.

Recieved my two blue ProStick+ today, and swapped them instead of my green Flightsticks (Radarbox) - The -3 dB messages went a little up (nothing else changed), maybe a more powerful amp, i don’t know… (But amps do amplify noise to)… No improvement in message count/s, planes on the map, or range… If someone are courious; i got two Pi’s, two antennas, and two LNA’s, I can run them side-by-side, only difference being the antennas.

One annoying “feature” though, the housings are way to large, you can’t even fit the powercable in a Pi4 (in Argon ONE case), and you can’t use any other of the USB-ports because of this big guy… Gonna sell those again.


Note: Don’t take this as a review - But i’m disappointed with this product, when another competitor can make them (a lot) smaller, similar price and same (or better) performance. Really, not impressed.

Get one of these instead, if you wanna use other USB-ports on your Pi;

This could also be related to a bit more traffic today than the days before.

If you are living in an optimal environment, you will not see a difference, both stick are then able to deliver similar values.
We made your experience on a different location too.

That’s why many people are using a pigtail/USB extension cable.
The devices are getting warm, some hot. Maybe a smaller case would cause problems.

I doubt - The other receiver was running at normal… (I did not swap both at once)…
And when i swapped the dongles, the only improvement was nothing. Other than the FA stick blocks all other USB ports - Bad design…

You’re not the first to complain about the width of the Pro Stick and Pro Stick Plus. We’re working on a series of updated designs for both. The first round will feature slightly better performance and should be available later this year. The second round of improvements will address form factor. We hope to have those available for sale in Q2 of 2021.

I’m sorry you’re disappointed. USB extension cords are a good option if you need access to the other ports.

That is exactly what almost everyone does. I have two ProSticks plugged into one RPi (orange for 978 & blue for 1090) , one directly, other through short USB cable.

I am also using RB24 RadarStick (green) on another Pi. Due to small form factor/case size, it runns pretty warm. Some users have found followowing solution for this:

1 Like

Friend of mine is using the stick outdoor in a case where the Raspi is in, but a fan is blowing fresh air into it all the time

He also mentioned that it’s getting damn hot from time to time without extra cooling.

I’m happy to see how V2 ends up :slight_smile:

Yeah, a short USB-Extender would solve the problem for now.

To be fair, it looks like i got a little more range… The rangeplot on my VRS seems to have increased a little. But maybe it’s just the higher gain. The messages > -3dB has bumped up a little vs. the green stick.

I’ve seen such range deviations from time to time, it could be also depending on the weather.
My graphs1090 are showing a max average of max. 150NM on bad days and >160NM on good weather days.

Maybe it’s by chance, but it is reproducable

It was in my mind the weather could play a role… But the other reciever is still getting the same range as always.
Reciever one, running blue stick, is usually peaking at around 207-209 nm (with the green stick). It’s on 222 nm today.
Reciever two is still running the green stick, it has been peaking on 231-235 nm on different days. It’s on 231 nm today. I have to find an USB-extender to get the other blue stick running.

I had larger deviations while having low amount of traffic. Could be that a single aircraft is plotting it by simply doing the same flight a little more far away as usual.

Any deviation of 10NM i am counting as “ground noise”.

What also can happen is something like this:

This peak gave me a 256NM range on Radarbox which is clearly not valid and created by bad/wrong data of a single aircraft.