Ground Station FSK files are not decoding

[GMW1988]

I have a question with the Ground Station. F Command is for FSK with decoding Ground Station. When I push F it takes me to another page but does not show the incoming signal. Is there something else I need to do to get into the FSK mode on the Ground Station? [IMG_3748.jpg (view on web)](url)

To test things I cleared the files both BPSK and FSK on the Ground Station. It took more than 3 times to get BPSK packets to be decoded; however, BPSK health I was able to get decoded.

However, I tried multiple times with FSK and I can't get the Ground Station to decode it. I put the Cubesatsim into FSK mode with 2 flashes and on my radio I can hear a long continuous rumbling sound and so I understand this is the FSK file be transmitted from the Cubesatsim. I am wondering if this is soldering issue. Is there some voltmeter checks that would be helpful to pinpoint any soldering issue? Should I check some key resistors and diodes with a voltmeter? I not exactly sure which setting or exactly how to check components with the voltmeter. Would DC 20 V be a good setting to check Cubesatsim. I not thinking this is a software issue. I even made sure that the antennas are pointing up in correct direction for the best signal. I had to tape them to a box. Here some photos of my solder work and BPSK and FSK files from the Ground Station.

[alanbjohnston]

Hi Gregory,

Your BPSK decoding in FoxTelem looks good. That means you have the CubeSatSim in Mode 3 (three blinks) for BPSK and you are have set FoxTelem Telem Format to BPSK 1200bps (Fox1E)

To decode FSK, you need to have the CubeSatSim in Mode 2 (two blinks) for FSK and you will hear a rumbling sound - it sounds like you have this. In the OpenWebRX WebSDR, it will look like this:

In FoxTelem, you need to set Telem Format to FSK 200bps (Fox1). You might have to click on Stop in order to change it, then click Start again. Then, FoxTelem should look like this:

I marked in green the Telem Format setting, the FSK signal in the FFT (you might have to click on it to get it to lock on), and the eye diagram.

Now you should see the Frame and Payload counts increasing every 4 seconds.

Alan

[GMW1988]

Ok I have not been setting Fox Telem in correct frequency and so this must be the issue I experienced.  I will be able to check later today but it good see my error.Thank you this is helpful information.Gregory Sent from my iPhoneOn Jul 8, 2025, at 10:07 AM, Alan Johnston ***@***.***> wrote: Hi Gregory, Your BPSK decoding in FoxTelem looks good. That means you have the CubeSatSim in Mode 3 for BPSK and you are have set FoxTelem Telem Format to BPSK 1200bps (Fox1E) To decode FSK, you need to have the CubeSatSim in Mode 2 (two blinks) for FSK and you will hear a rumbling sound - it sounds like you have this. In the OpenWebRX WebSDR, it will look like this: WebSDR.FSK.png (view on web) In FoxTelem, you need to set Telem Format to FSK 1200bps (Fox1). You might have to click on Stop in order to change it, then click Start again. Then, FoxTelem should look like this: FSK.png (view on web) I marked in green the Telem Format setting, the FSK signal in the FFT (you might have to click on it to get it to lock on), and the eye diagram. Now you should see the Frame and Payload counts increasing every 4 seconds. Alan —Reply to this email directly, view it on GitHub, or unsubscribe.You are receiving this because you authored the thread.Message ID: ***@***.***>

[GMW1988]

Hi Alan,
Thanks for your help. This was the answer!! I got it to work with FSK decoding. I was just a little confused with the Ground Station settings.
It so good to have it working!!

Gregory