Not getting the PPM values

[kalustian]

I was trying to run some commands in mi Pi2 to get the PPM information. I tried to follow instructions on the stratux web UI settings ( under Help ) page and after doing the 3rd command I got below results - what I did wrong ?

NOTE - I am running stratux-v0.8r2-db130aab76.img

pi@raspberrypi ~ $ sudo su - root@raspberrypi:~# pkill screen root@raspberrypi:~# kal -g 48 -s GSM850 Found 1 device(s): 0: Generic RTL2832U OEM

Using device 0: Generic RTL2832U OEM

Kernel driver is active, or device is claimed by second instance of librtlsdr. In the first case, please either detach or blacklist the kernel module (dvb_usb_rtl28xxu), or enable automatic detaching at compile time.

usb_claim_interface error -6 Failed to open rtlsdr device #0.

Thanks-

[skypuppy]

is stratux running while you try this?

On 03/21/2016 10:30 PM, kalustian wrote:

I was trying to run some commands in mi Pi2 to get the PPM information. I tried to follow instructions on the stratux page and after doing the 3rd command I got below results - what I did wrong ?

NOTE - I am running stratux-v0.8r2-db130aab76.img

pi@raspberrypi ~ $ sudo su - root@raspberrypi:~# pkill screen root@raspberrypi:~# kal -g 48 -s GSM850 Found 1 device(s): 0: Generic RTL2832U OEM

Using device 0: Generic RTL2832U OEM

Kernel driver is active, or device is claimed by second instance of librtlsdr. In the first case, please either detach or blacklist the kernel module (dvb_usb_rtl28xxu), or enable automatic detaching at compile time.

usb_claim_interface error -6 Failed to open rtlsdr device #0.

Thanks-

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[kalustian]

yes, stratux running and connected via ethernet cable so I can SSH

[Ergonomicmike]

service stratux stop ??? (Just hacking.)

[kalustian]

after used the following command: sudo service stratux stop the scanning command works, but it does not returned any channel#

here is the results after 3-4 min:

pi@raspberrypi ~ $ sudo su - root@raspberrypi:~# sudo service stratux stop [ ok ] Stopping Stratux ADS-B Receiver: stratux. root@raspberrypi:~# kal -g 48 -s GSM850 Found 1 device(s): 0: Generic RTL2832U OEM

Using device 0: Generic RTL2832U OEM Found Rafael Micro R820T tuner Exact sample rate is: 270833.002142 Hz [R82XX] PLL not locked! Setting gain: 48.0 dB kal: Scanning for GSM-850 base stations. GSM-850: root@raspberrypi:~#

Looks likes it did not return any channel#

[kalustian]

Note...I used kal -g 48 -s GSM900 instead and it returns the following channel:

chan: 119 (958.8MHz + 13.753kHz) power: 92899.08

QUESTION - should I used GSM900 instead GSM850 for the PPM correction ??

Thanks-

[Axtel4]

You can use GSM900 for GSM850.

Depending on the frequency range of your SDR, you can also try: EGSM, DCS or PCS

[skypuppy]

especially if you have a cordless phone nearby. :)

On 03/22/2016 06:45 PM, kalustian wrote:

Note...I used kal -g 48 -s GSM900 instead and it returns the following channel:

chan: 119 (958.8MHz + 13.753kHz) power: 92899.08

QUESTION - should I used GSM900 instead GSM850 for the PPM correction ??

Thanks-

— You are receiving this because you commented. Reply to this email directly or view it on GitHub https://github.com/cyoung/stratux/issues/343#issuecomment-200081769

[kalustian]

OK, I will try EGSM, DCS or PCS and test drive - thanks lot

[jthawkes]

Is the ppm info worth worrying about? A few PPM at 1090Mhz with 2Mhz bandwidth is probably not going to make any difference. Spend the money on an 820T2 model.

[cyoung]

chan: 119 (958.8MHz + 13.753kHz) power: 92899.08

Looks like you picked up a channel that you can kal off of. Now do kal -g 48 -c 119.