Hi, I’m trying to set the SatNOGS station. It consist of: RPi 3 + RTLSDR (old, not v3) and cross dipole antenna.
At a beginning I have head a blank or purple waterfall. In troubleshooting I have found that this can be due the RF Gain. I went to Advanced SatNogs client settings and set it to 7.7. The waterfall is now visible but it is not OK. Have also try 15.7 but it is the same. The strange thing is that the waterfall is 0.25 sec. Is this still the RF gain problem or something else?
I have checked metadata on observation #1084167 (the same sat and time) and there is RF Gain increased from default to 36.4.
I’m not a Linux guy. Any ideas are welcome. I ordered SDRRTL v3 but need to wait for it.
and after test if you received signal with Kalibrate-rtl and adpated antenna for GSM. With result you can setting SATNOGS_PPM_ERROR in Advanced configuration of satnogs-setup and Apply configuration.
I’ve tested several parameter better result for me is no lna and 49.6 gain with 69 ppm correction (Old blue key SDR device).
Tnx. You can have the same sdr that I have (mine is black but it is the same as the popular blue)
I have tested it with rtl_test but not calibrated. I will try this in the evening.
But also see that 15.7 gain can be insufficient.
Some small progress. After installing img on new sd card the rtl_test -p is working.
I was able to set the ppm correction.
Now the problem is still with observation duration. The observations are 0.25 sec.
I have tried to experiment with RF Gain but it not change waterfall. The logs for satnogs client is showing no errors.
Problem solved, station is running. Problem with duration of observations was in RTL-SDR.
The old one is damaged somehow. When I have connected new sdr v3 it started working OK.
Summary
There ware at least two problems:
SD card with write problems
not working SDR
There can be also an third problem with user rights but I’m not sure. Last time I have created a new installation on SD card I have configured all things as sudo su.