RPi 3 with R820T2 results in noise

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boatnerd

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Sep 2, 2011
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Trying to set up my first RPi radio to feed into Broadcastify and have some questions. I set this up based on the documentation found here: Raspberry Pi RTL-SDR Broadcastify - The RadioReference Wiki

I’m running an RPi 3 with version 4.9.35-v7+ #1014. The radio is a NooElec NESDR Mini 2 USB Stick (RTL2832 + R820T2.

1. I have connected to the feed but all I get is noise: Link https://www.broadcastify.com/listen/feed/11010/web
Is this a gain issue or other problem?

2. When I run the script (/usr/local/bin/rtl_fm -d 0 -M fm -f 162.55M -p 69 -l 65 -g 50 -t 2 -E pad -s 12k ) It reads the frequency as:
Tuned to 162802000 Hz.
Is this correct?

Trying to run NOAA Wx for a sound check, I’ve tried local FM radio and get the same results, noise and strange frequency display.

Full script I am running is below.

pi@PIScanner:~ $ /usr/local/bin/rtl_fm -d 0 -M fm -f 162.55M -p 69 -l 65 -g 50 -t 2 -E pad -s 12k | /usr/bin/lame -r -s 12 --resample 22.05 -m m -b 16 --cbr --lowpass 4 - - | /usr/bin/ezstream -c /etc/ezstream_bcfy.xml &
[1] 1177
pi@PIScanner:~ $ Found 1 device(s):
0: Realtek, RTL2838UHIDIR, SN: 00000001

Using device 0: Generic RTL2832U OEM
ezstream: Connected to http://audio#.broadcastify.com:80/mountpoint
ezstream: Streaming from standard input
Found Rafael Micro R820T tuner
Tuner gain set to 49.60 dB.
Tuner error set to 69 ppm.
Tuned to 162802000 Hz.
Oversampling input by: 84x.
Oversampling output by: 1x.
Buffer size: 8.13ms
Exact sample rate is: 1008000.009613 Hz
Sampling at 1008000 S/s.
Output at 12000 Hz.Sampling at 1008000 S/s.
Output at 12000 Hz.
 

boatnerd

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Sep 2, 2011
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Spent some time on this today and it need to have the ppm offset adjusted.

Using these settings
/usr/local/bin/rtl_fm -d 0 -M fm -f 156.4M -f 156.5M -f 156.55M -f 156.6M -f 156.8M -f 157.05M -f 157.1M -p 40 -l 60 -g 45 -t 2 -E pad -s 12k |
/usr/bin/lame -r -s 12 --resample 22.05 -m m -b 16 --cbr --lowpass 4 - - |
/usr/bin/ezstream -c /etc/ezstream_bcfy.xml &
 
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