Bias Tee not permanent

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highway61ie
Posts: 1
Joined: Wed Jun 23, 2021 1:33 am

Bias Tee not permanent

Post by highway61ie » Wed Jun 23, 2021 1:53 am

Folks,
I'm using and original RTL-SDR v3 dongle , Raspberry pi3 with FR24 image .Multiple feeds .All works great . I bought an original RTL-SDR BLOG 1090 MHZ ADS-B LNA. Every feeder stops :-( After much investigation and help from the incredible members of various different forums I come to the realization that the Bias Tee is off be default .That's OK . I stop all the feeders and dump 1090 mutabily and run the recommended method to enable . I get this result but Bias Tee won't come on unless I do it manually . i,e , turn off all feeders and dump 1090 etc and then run ...rtl_eeprom -b y .
Below is a snip from the output ...USB_claim_interface error -6 because I hadn't stopped the FR24 feed .I had stopped all the rest at this stage . Sorry if this is a bit long winded but just wanted to let you guys know what I tried :-)
:oops:

[email protected]:~ $ rtl_eeprom -b y
Found 1 device(s):
0: Generic RTL2832U OEM

Using device 0: Generic RTL2832U OEM
usb_claim_interface error -6
Failed to open rtlsdr device #0.
[email protected]:~ $ lsusb
Bus 001 Device 011: ID 0bda:2838 Realtek Semiconductor Corp. RTL2838 DVB-T
Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp. SMSC9512/9514 Fast Ethernet Adapter
Bus 001 Device 002: ID 0424:9514 Standard Microsystems Corp. SMC9514 Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
[email protected]:~ $ sudo service fr24feed stop
[email protected]:~ $ rtl_eeprom -b y
Found 1 device(s):
0: Generic RTL2832U OEM

Using device 0: Generic RTL2832U OEM
Found Rafael Micro R820T tuner

Current configuration:
__________________________________________
Vendor ID: 0x0bda
Product ID: 0x2838
Manufacturer: Realtek
Product: RTL2838UHIDIR
Serial number: 00000001
Serial number enabled: yes
Bias-T Always ON: yes
Direct Sampling Always ON: no
__________________________________________

New configuration:
__________________________________________
Vendor ID: 0x0bda
Product ID: 0x2838
Manufacturer: Realtek
Product: RTL2838UHIDIR
Serial number: 00000001
Serial number enabled: yes
Bias-T Always ON: yes
Direct Sampling Always ON: no
__________________________________________
Write new configuration to device [y/n]? y

Configuration successfully written.
Please replug the device for changes to take effect.
[email protected]:~ $ echo 'blacklist dvb_usb_rtl28xxu' | sudo tee – append /etc/modprobe.d/blacklist-dvb_usb_rtl28xxu.conf
blacklist dvb_usb_rtl28xxu
[email protected]:~ $ rtl_eeprom -b y
Found 1 device(s):
0: Generic RTL2832U OEM

Using device 0: Generic RTL2832U OEM
Found Rafael Micro R820T tuner

Current configuration:
__________________________________________
Vendor ID: 0x0bda
Product ID: 0x2838
Manufacturer: Realtek
Product: RTL2838UHIDIR
Serial number: 00000001
Serial number enabled: yes
Bias-T Always ON: yes
Direct Sampling Always ON: no
__________________________________________

New configuration:
__________________________________________
Vendor ID: 0x0bda
Product ID: 0x2838
Manufacturer: Realtek
Product: RTL2838UHIDIR
Serial number: 00000001
Serial number enabled: yes
Bias-T Always ON: yes
Direct Sampling Always ON: no
__________________________________________
Write new configuration to device [y/n]? y

Configuration successfully written.
Please replug the device for changes to take effect.
[email protected]:~ $ ./rtl_biast -b 1
-bash: ./rtl_biast: Is a directory
[email protected]:~ $ cd rtl-sdr-blog
[email protected]:~/rtl-sdr-blog $ cd build
[email protected]:~/rtl-sdr-blog/build $ cd src
[email protected]:~/rtl-sdr-blog/build/src $ ./rtl_biast -b 1
Found 1 device(s):
0: Realtek, RTL2838UHIDIR, SN: 00000001

Using device 0: Generic RTL2832U OEM
Found Rafael Micro R820T tuner
[email protected]:~/rtl-sdr-blog/build/src $ sudo service fr24feed start
[email protected]:~/rtl-sdr-blog/build/src $ sudo systemctl start rbfeeder
[email protected]:~/rtl-sdr-blog/build/src $ sudo systemctl start dump1090-mutability
[email protected]:~/rtl-sdr-blog/build/src $ sudo systemctl start adsbexchange-feed
[email protected]:~/rtl-sdr-blog/build/src $ sudo systemctl start pfclient
[email protected]:~/rtl-sdr-blog/build/src $ sudo systemctl start rbfeeder
[email protected]:~/rtl-sdr-blog/build/src $

rtlsdrblog
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Posts: 2942
Joined: Mon Nov 19, 2012 11:54 pm

Re: Bias Tee not permanent

Post by rtlsdrblog » Thu Jul 08, 2021 11:02 am

Have you tried this guide for enabling the bias tee on their FlightRadar24 software?

https://forum.flightradar24.com/forum/r ... post129854

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