SopySDR+Funcube Dongle Pro+MultimonNG+Pocsag

[David H]

Hi, 

I am using RTL-SDR with rtl_fm and pipe my SDR dongle to multimonNG to decode pocsag. It's working well on my pi4. 

Now I am trying to do the same with my old Funcube Dongle Pro. I have installed SopySDR with SoapyFCDPP plugin. I find the device. I have installed rx_tools. And now I am trying to pipe it with rx_fm to multimon-ng. 

I am running SoapySDRUtil --find. I do find my funcube dongle. 

Found device 0
  alsa_device = hw:1,0
  device = Funcube Dongle Pro (96k)
  driver = fcdpp
  hid_path = 0001:0004:02
  is_plus = false
  period = 0

Then i run rx_fm  -f 169.800M -s 22050 -g 45 -p 1 | multimon-ng -t raw -a POCSAG1200 -f alpha /dev/stdin -C SE

multimon-ng 1.1.8
  (C) 1996/1997 by Tom Sailer HB9JNX/AE4WA
  (C) 2012-2019 by Elias Oenal
Available demodulators: POCSAG512 POCSAG1200 POCSAG2400 FLEX EAS UFSK1200 CLIPFSK FMSFSK AFSK1200 AFSK2400 AFSK2400_2 AFSK2400_3 HAPN4800 FSK9600 DTMF ZVEI1 ZVEI2 ZVEI3 DZVEI PZVEI EEA EIA CCIR MORSE_CW DUMPCSV X10 SCOPE
Enabled demodulators: POCSAG1200
usb_claim_interface error -6
usb_claim_interface error -6
[INFO] makeFCDPP
Using device FCD:
Found 1 channel(s) :
Channel 0 :
[INFO] listAntennas
  Found 0 antenna(s):
  Found 3 gain(s): LNA Mixer IF
[INFO] listFrequencies
  Found 1 frequencies: RF
[INFO] listSampleRates
  Found 1 sample rates: 96000
[INFO] listBandwidths
  Found 0 bandwidths:
[INFO] setup stream
[INFO] Setting LNA gain: 30.000000
[INFO] Setting Mixer gain: 12.000000
[INFO] Setting IF gain: 5.000000
Tuner gain set to 45.00 dB.
Tuner error set to 1 ppm.
[INFO] setBandwidth
Bandwidth set to automatic resulted in 0 Hz.
[INFO] listFrequencies
[INFO] getFrequency
Tuned to 170053575 Hz.
Oversampling input by: 46x.
Oversampling output by: 1x.
Buffer size: 8.08ms
Sampling at 1014300 S/s.
Output at 22050 Hz.
[INFO] activate stream

But i don't se any decoded messages. I think the my pipe is wrong. Any tip?

ignore:

usb_claim_interface error -6

usb_claim_interface error -6.

Its my two rtlsdr sticks in use with rtl_fm

Thanks in advance

David