New station for Amsterdam island!


I have a friend who is going 6 months/1years on the island of amsterdam (india ocean).

I would like to give him an omnidirectional station link to satnogs.

For now here is the config envisaged:

QFH antenna 430mhz DIY.
LNA4All (standard)
LNA4All (standard, optional)
Raspberry pi3b +

  • rj45 / official alim5v

Everything except the antenna will be in a waterproof case.

On this island apart from a satellite connection there is nothing (no FM, no mobile network and no wifi).

So I would like to know that it is the average flow required for a satnogs station ?

If the project is concluded I intend to continue my connection with the French Polar Institute to take this station to the Concordia base (Dome C).

What do you think ?
Advice on the material chosen? (be careful it leaves on October 28th so not a lot of time).

Why not VHF? Because we can only bring a lot of stuff and a VHF antenna takes a lot more space than a UHF.


I think your setup looks fine.
The only thing I would add is a spare - prebuilt - SD card for the Pi.

This post here has a lot of information on how much data is used by a typical station


+1 on the above (@thebaldgeek I’ve changed a little the link to point to the one that pierros analyse the bandwidth)

If the bandwidth above seems to be too much, we can probably decrease it by either schedule less observations or maybe cutting the audio and leave only waterfall and data which need less bandwidth (at least until we move to the waterfall-data instead of waterfall-image that we currently send).


Super that’s exactly what I was looking for

on my new list a add 2 micro sdcard and 1 usb key with etcher and prebuild image.
Is it possible to feed the 2 LNA4ALL with the 5v GPIO raspberry?
Or does it need a dedicated 5v power supply?

Go to the LNA4ALL website;
Scroll down and look at the mods for the different power supply options.
I did the external 5v option (place the zero ohm jumper) and then took a USB lead and cut the end off.
One end plugs into one of the Pi USB ports, the other is soldered on the LNA4ALL.
It works just fine.

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do you think it would be possible to deactivate the download of the sound actualy ?

my contact said it has 100ko/s for upload rate.

ok nice ! it’s a good LNA !

As far as I know there isn’t any option right now for diactivated, so there two options, either implement this option or install it as it is and perfor locally at the installation the necessary changes.

I’m not sure if we will make it to have this option ready in the October, so probably we would need to go on with the second option.

Just to be sure, is the problem the internet speed (bandwidth rate) or the total volume of data (specific GB limit). In the first case, 100kb/s should be ok for the audio too, in the second case indeed we will need to limit the uploaded data.

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My two cents for this project:

  • Firstly: Super exciting opportunity and thank you for contributing!
  • For such a location (with limited serviceability) I would go for more rugged setup with proven components.
  • We are preparing an updated version of the reference no-rotator ground station (with intention of that being a kit). Check the BOM here and some pictures of how this looks. I would advise going for such a solution.
  • For such an extreme location we (LSF) might be able to help with procuring some parts and setup (and special software requirements). Please reachout to pierros@ libre dot space or reply here to figure out how we help more.



Thanks for support.
Unfortunately no budget will not allow to leave on such an advanced config.
The budget is currently in the 400euros.

I think to change the 2 LNA4ALL by the amp ZX60-12LN +.

The antenna will be outside but the electronics will be inside to test a realistic configuration for the south pole (-60/-80°C)

I do not plan to use on the raspberry pi 4 because it requires active cooling which is not allowed to the pole because of the production of static electricity from the ventilator and very low humidity.
In addition to the rtl-sdr, the rpi3b + is powerful enough.

In our configuration no need for filter because we will install the station in an area far from civilization

It is the antenna of this station that I intend to use :

Hello. After further investigation I know we will have the right to only 220kbits/s (27.5ko/s) sends.

So I think I have to deactivate the sending of the sound to stay in resonable use of bandwidth (we are not all alone on it).

Hey I’m going to create a temporary (hackish) version for not uploading audio, until we make a release of client that allows that from the settings menu. I’ll let describe here in detail what you will need to do.

Let us know if there is any remaining issue with the station.

Thank you!


Hi @dragonlost,

So here are the steps to run the client with the changed version that doesn’t upload audio but only waterfall and data:

  1. Install and setup the client as described in
  2. And configure the Basic configuration according to by running sudo satnogs-setup
  3. Go back and hit Apply in satnogs-setup and then exit. After that make sure that you see the station online/testing mode in SatNOGS Network (it shouldn’t take more than 5min)
  4. Run again sudo satnogs-setup and go to Advanced configuration
  5. Go to SATNOGS_CLIENT_URL option and add this url:
  6. Go back and hit Update
  7. After finishing update, go to Advanced configuration again and set:
  8. Go back and hit Apply
  9. Exit satnogs-setup
  10. Now you should run the version that doesn’t upload the audio file

As the bandwidth is low and shared, as you described, I suggest also you shape the upload and download speeds. I suggest you use a script called wondershaper. Here are the steps you need to set it up:

  1. Run sudo apt install wondershaper
  2. Find the network interface you want to shape by running ip addr, for example on my pi are eth0 for cable network and wlan0 for wifi one.
  3. Shape the traffic by running sudo wondershaper [interface] [download speed in Kbps] [upload speed in Kbps], for example on my pi that uses the cable network, for shaping download to 10KB/s and upload to 5KB/s I ran sudo wondershaper eth0 80 40
  4. The above will try to keep the average speed to these limits, this means that sometimes it can pass the limit for few seconds.

Let us know if you have any question or you need anything else for the station setup.