Transmit data with PlutoSDR but no signal

Question

Transmit data with PlutoSDR but no signal

John132-LI opened this issue a year ago · comments

I follow the instructions to build the project on Ubuntu 20.04. Then create "gpssim.bin" and try to transmit to Pluto SDR via "plutoplayer".
Command lines are shown as:
./gps-sdr-sim -e brdc0360.23n -l 1.378898,103.807031,100 -d 300 -s 4000000
./plutoplayer -t gpssim.bin -a -80.0 -b 5.0

Everything seems fine and the console shows "Transmit starts"
but when I use "GPS test" to check the sinal , no satellite is found(Andorid,only on Plane mode)
I don't know if the device is transmitting or not. Anyway to trace it?
How could I find out If something goes wrong ?
Any help would be sincerely appreciated :)

vxling · Answer 1 · Wed Apr 19 2023 08:02:30 GMT+0800 (China Standard Time)

I checked with UBlox, it received signals but the data invalid.

vxling · Answer 2 · Wed Apr 19 2023 08:05:06 GMT+0800 (China Standard Time)

Have you replaced the TXCO on Pluto?

OSQZSS · Answer 3 · Wed Apr 19 2023 08:56:27 GMT+0800 (China Standard Time)

@John132-LI The original XO on the PlutoSDR board has a very large frequency offset. You need to supply more stable external clock input or replace it to a TCXO.
https://s-taka.org/en/plutosdr-tcxo-upgrade/

John132-LI · Answer 4 · Wed Apr 19 2023 10:08:06 GMT+0800 (China Standard Time)

Thanks for your help. 👍
It turns out that the TX1 channel goes wrong.
I get rid of it and finnally receive signal.
But when I try another test, this error occurs:

* Transmit starts... ERROR: READ LINE: -32 Error pushing buf -32 Done. ERROR: READ LINE: -32 ERROR: READ LINE: -32
What's happening?

DanishAliChanna · Answer 5 · Mon Nov 20 2023 16:24:58 GMT+0800 (China Standard Time)

hello John132-LI

how you solved your problem? i am facing same issue as yours? it appears transmit starts but then no output has shown.

John132-LI · Answer 6 · Mon Nov 20 2023 17:17:15 GMT+0800 (China Standard Time)

hello John132-LI

how you solved your problem? i am facing same issue as yours? it appears transmit starts but then no output has shown.

@DanishAliChanna Hi,thanks for you reply.
My problem is that there was a wrecked capacitor on the motherboard. It took me a few days to find that.
So I replaced it with a new one then everything went fine!
Unfortunately it's been more than half a year and I've forgotten the details.
But I assure that using "Player.c" is the easiest way to create the ouput signal.
May all go well with you！

DanishAliChanna · Answer 7 · Tue Nov 21 2023 00:02:24 GMT+0800 (China Standard Time)

Hello dear, Thank you for your reply. actually i want to ask you, have you modified TCXO in plutoSDR for transmitting gps signals? i have read the thread that the owner was saying to update this. I am stuck with this problem. can you please help me out to get rid of this issue. since last month i am struggling with this. can you send me the default setup of your project? or can you give me your whatsapp or any other kind of contact so i can discuss with you on this topic. to be very honest i am not going to take your long time i just want your 5 minutes to discuss the default setup of this project. thank you once again for your kind response, i am waiting to hear from you. regards

…

On Mon, Nov 20, 2023 at 5:17 PM John132-LI ***@***.***> wrote: hello John132-LI how you solved your problem? i am facing same issue as yours? it appears transmit starts but then no output has shown. @DanishAliChanna <https://github.com/DanishAliChanna> Hi,thanks for you reply. My problem is that there was a wrecked capacitor on the motherboard. It took me a few days to find that. So I replaced it with a new one then everything went fine! Unfortunately it's been more than half a year and I've forgotten the details. But I assure that using "Player.c" is the easiest way to create the ouput signal. May all go well with you！ — Reply to this email directly, view it on GitHub <#369 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/BEAAH4P4VKSRQRBEX3OVONDYFMN2PAVCNFSM6AAAAAAWZ6BVMWVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMYTQMJYGUYTSMRWGY> . You are receiving this because you were mentioned.Message ID: ***@***.***>

Rupak910 · Answer 8 · Tue Jan 16 2024 01:29:59 GMT+0800 (China Standard Time)

I follow the instructions to build the project on Ubuntu 20.04. Then create "gpssim.bin" and try to transmit to Pluto SDR via "plutoplayer". Command lines are shown as: ./gps-sdr-sim -e brdc0360.23n -l 1.378898,103.807031,100 -d 300 -s 4000000 ./plutoplayer -t gpssim.bin -a -80.0 -b 5.0

Everything seems fine and the console shows "Transmit starts" but when I use "GPS test" to check the sinal , no satellite is found(Andorid,only on Plane mode) I don't know if the device is transmitting or not. Anyway to trace it? How could I find out If something goes wrong ? Any help would be sincerely appreciated :)

hello john132-LI

i am also using pluto sdr.
But i cant transmit the signal. It is saying plutoplayer is not recognised. As you have already used it, can you help me out with what i should do here.