F1ATB forum - Remote SDR

spectrum center frequency alignment

Mon, 02 Mar 2026 16:41:30 +0000

the frequency of the central beacon on the spectrum is not in the center and does not coincide
with that indicated in the strip below
if I align the two frequencies with manual correction the correction comes eliminated by enabling self-correction
how to center the spectrum?

main page connection

Sat, 06 Dec 2025 18:43:36 +0000

I installed version 5 of remotesdr on a raspberry p4 because
it allows me to use an RTL receiver;
when I try to connect to the main page ip:8000/remote_sdr.html
I receive a message saying that the connection is refused:
I haven't been able to understand why
The setup page connects.
Can you help me?

Remote SDR sur Bookworm

Tue, 16 Sep 2025 16:41:49 +0000

Bonjour,

J'essaie d'installer manuellement remsdr sur une base bookworm.
Avez vous prévu de faire une migration sur cette nouvelle distribution ?
L'installation des pré requis est beaucoup plus simple car tout est disponible en package.

L'idée est de faire tourner remotesdr sur le pluto lui-meme.

73
Evariste F5OEO

Remote SDR for EME

Sun, 29 Jun 2025 08:09:37 +0000

Hi to all,
I´m building a remote control 23cm EME station. The place of my 3m dish are 15km away from home QTH with no obstacles direct patch.
5Ghz Ubiquiti airOS5 give me the network connection and Raspberry Pi3 and Pi4 + Arduino hardware doing all the jobs in remote place.
I found perfect for my purposes, Andre F1ATB Remote SDR tool, that I configured to use with SDRplay RSP1a for RX and HackRFone for TX side...
I´m now setting up the Raspberry pi4 with Remote SDR, I wonder wath is the best way to run WSJT-x and Remote SDR together ?
As there aren´t "virtual audio cables" for Linux, have to use ALSA + PULSE to managing audio in outs??
Anybody have experienced on this matter? Any comments are welcome.
Thank you very much in advance.
Jorge
EA2LU
Loc IN92dt
Attached photo of the dish and the box where the full setup will be allowed.

EME 25-10-2024, 11-31-19.jpg (Taille : 477.63 Ko / Téléchargements : 4)

reception QO 100

Tue, 15 Apr 2025 15:00:05 +0000

Bonjour à tous,
Je viens de réactiver ma licence radio amateur passée en 1983 .....
Mon indicatif : F6 IHF
aujourd'hui j'aimerais me lancer dans la réception QO100.
Pendant des années, j'ai travaillé dans le monde de la réception TV satellite, je devrais pouvoir m'en sortir.
j'ai en ce moment une parabole de 80cm pointée sur Astra 28E, je suis dans le sud de la France (Lozere).
je dispose d'une clef USD compatible SDR " Nooelec RTL-SDR v5 SDR" , j'arrive à recevoir les satellites Noaa en VHF avec SDR sharp.
Pour QO 100 26°E , je me pose la question de savoir si la reception de BADR 8 26E est recevable avec une 80cm ici.
ça me permettrais de pouvoir pointer QO100 plus facilement. Je dispose d'un analyseur/pointeur satellite avec décodeur TV intégré.
ma Question principale pour le moment est de savoir si avec SDR sharp je suis capable de visualisé sur l'analyseur les transpondeurs TV (la porteuse).
pour le moment je ne reçois aucune porteuse de Astra 28 en bande base verticale sur SDR sharp (je tiens compte de l'oscillateur local du LNB et de l'alim en 13V.).
Merci.
Cristof.

Hackrf tx setting

Fri, 28 Feb 2025 20:02:31 +0000

good evening,

I would like to be able to modify the tx gain parameters of the hack rf, is there a configuration file to save my gain parameters. ?

Thanks Alessio IK5PWR

Change resolution at FM

Sat, 01 Feb 2025 20:06:04 +0000

Hello,
i want to change the step at FM-Mode from 2.5khz to 100Hz or more, where can i do that?
Thanks a lot in advance!
vy 73,
Markus, DG7RAQ

Raspberry Pi5

Tue, 14 Jan 2025 08:40:49 +0000

hi everyone,

I tried to start the distribution made for the RPi4 on my RPi5 but it doesn't work, am I doing something wrong, is it ok?

Another question, I tried to do a new installation on my RPi5 with OS 11 (bullseye) 64 bit, but I couldn't start the system
it compiles everything from the instructions on the site, but it stops at the compilation of gnuradio, I install it in apt format, but then when I start it with the command
"node Radio_Server.js" the system gives me an error related to the CPU.js and onoff.js modules

Sorry but I'm not an expert in IT.

My goal would be to use an Rpi5.

Thanks

Alessio IK5PWR

ma premiere résolution

Sun, 05 Jan 2025 17:51:38 +0000

Bonjour André
Je te (vous) suis depuis pas mal de temps grace aux vidéos sur le routeur solaire (je suis équipé full victron depuis plusieurs année)
Mais en ce début d année 2025 la première résolution est enfin de m occuper de qo100
j ai fait au début de sa mise en orbite un essai de reception que j avais montré au RC avec sdrsharp ,une clef basique un tbias et une parabole de 80cm
Mais depuis j ai dormi
je voudrais bien faire maintenant un peu de tx sur Q0100
Alors je me suis rappelé de remote sdr
j ai au QRA plusieurs clefs qui vont de la clef bleu , nooelec rsp1a jusqu au pluto
Ce que je voudrais savoir c est parmi la fouletitude d orange pi disponible , lequel prendre pour correspondre a l image
orange pi zero3 ou pi 4A ou pi 3LTS car le PI zero2W car na a pas d USB
si tu as des liens , je suis preneur pour ne pas faire de bétises
73 Richard F5LLJ

Rspduo

Sat, 14 Dec 2024 08:01:28 +0000

Bonjour F1ATB,

Est-il possible d'utiliser un rspduo avec Remote SDR ?
Si non, auriez-vous quelques indications à me donner afin de modifier le code source ?

Très belle journée !

GPIO state change during TX

Sat, 23 Nov 2024 15:41:18 +0000

Hi All,

I am building my 1st QO-100 station and I designed it in a way that the PA's power is going through a relay.
I am interested in where to look in the Remote SDR's code in order to inject dedicated RPI's GPIO voltage level change when TX is ongoing.
What I want to achieve is to cut-off PA's power when there is no transmission in Remote SDR.

Other option would be to add a toggle switch somewhere on GUI to change the state of a dedicated GPIO. With that I would arm TX path with power when I plan to transmit.

3rd option would be to use PWM output from RPI. With a bit of filtering on the relay side I would turn the relay on only when certain PWM signal would appear. That would prevent reacion on voltage steady states.

If anyone has any idea please drop here a line or two.

Thanks!
73

Use of Airspy?

Wed, 25 Sep 2024 16:57:52 +0000

Hello I am new in this field but experient on EME.
At our club station we are considering the use of a webbased sdr transceiver.
Basically your setup covers the frequencies we want to use, i.e. 3400, 5760, and IF 144Mhz for 10Ghz.
As we have another application for this dish where an AIRSPY rx dongle is planned, my question is following:
Would it be possible to replace one Hackrf for an Airspy dongle?

Br. Jan, PAoPLY

node.js won't start

Sat, 24 Aug 2024 14:45:48 +0000

Hello to you,

Thanks Andrè for your big job to develop the Remote SDR.

I have had some strange problems with your raspi V5 Image. So I decided to get the newest Raspian for my Raspberry4 and do a manual installation.

But now I have the Problem that Node.js wont be start atached I have the error message:
Did somebody now what could be the problem, where can I start to search for a solution?
Unfortunatly I'm not firm with npm and Node.js.

Many thanks in advance for your help.

---------------------------------------------------------------------------------------------
root@RasPi:/remsdr# node Radio_Server.js
node:fs:2368
return binding.writeFileUtf8(
^

Error: EINVAL: invalid argument, write
at Object.writeFileSync (node:fs:2368:20)
at exportGpio (/remsdr/node_modules/onoff/onoff.js:18:8)
at new Gpio (/remsdr/node_modules/onoff/onoff.js:172:36)
at Object. (/remsdr/remsdr_modules/CPU.js:26:15)
at Module._compile (node:internal/modules/cjs/loader:1358:14)
at Module._extensions..js (node:internal/modules/cjs/loader:1416:10)
at Module.load (node:internal/modules/cjs/loader:1208:32)
at Module._load (node:internal/modules/cjs/loader:1024:12)
at Module.require (node:internal/modules/cjs/loader:1233:19)
at require (node:internal/modules/helpers:179:18) {
errno: -22,
code: 'EINVAL',
syscall: 'write'
}

Node.js v20.16.0

____________________________________

Pas de BF ?

Fri, 16 Aug 2024 12:33:37 +0000

Bonjour à tous et meilleures 73.

Je me casse la tête depuis 2 jours sur ce problème : Pas moyen d'avoir la BF sur Chrome (version 127.0.6533.120 et Remote_Sdr en version 5.08)
Mais , sur la page WEB, pas moyen de bouger les potentiomètres de volume ??? Que ce soit sur la page normale ou sur la page qui apparaît après l'appui sur la flèche de la page normale.
Qu'est-ce que je rate ?
73 QRO/ Michel de F5AAJ.

Re-Bonjour.
Oups ! Trouvé : RESET paramètres, comme indiqué dans la page dépannage.
Merci André pour ce joli petit programme !
73 QRO. Michel de F5AAJ.

Remsdr . V05 , no TX

Sat, 06 Jul 2024 14:53:17 +0000

Dear Andre ,

Have a problem in my setup of no TX after installation of new vers. 0.5. When running setup stand alone (only raspberry Pi4 , keyboard, and mouse, the TX working normally, but when connect to lan the TX button working normally with red senoid, but no power in the output of Adalm Pluto. Many tests were carried out and suppose the hardware part are ok. Also tested with last version of Chrome and old version of Chromium. Additional test was done with disabled firewall. Kindly request if can give any additional information to try to solve the matter.

Best and Rgds

73 ! Fernando - Py2sdn