Can't detect 5G network

[platyman]

Issue Description

Everything seems to be starting up, but I'm seeing a series of strange messages in the logs + I can't detect my network on the UE

Setup Details

I work with an ansdr E316 from microphase with an external GPS. Here is my configuration file (from GnodeB):

cu_cp:
  amf:
    addr: 127.0.0.5
    port: 38412
    bind_addr: 127.0.0.1
    supported_tracking_areas:
      - tac: 7
        plmn_list:
          - plmn: "20690"
            tai_slice_support_list:
              - sst: 1

ru_sdr:
  device_driver: uhd
  device_args: type=ant,num_recv_frames=64,num_send_frames=64,master_clock_rate=30.72e6
  srate: 30.72
  otw_format: sc12
  tx_gain: 60
  rx_gain: 30
  clock: default
  sync: default

cell_cfg:
  dl_arfcn: 667000
  band: 77
  channel_bandwidth_MHz: 10
  nof_antennas_dl: 2
  nof_antennas_ul: 2
  common_scs: 30
  plmn: "20690"
  tac: 7
  pci: 1
  prach:
    prach_config_index: 0

log:
  filename: /tmp/gnb.log
  all_level: debug

pcap:
  mac_enable: false
  mac_filename: /tmp/gnb_mac.pcap
  ngap_enable: false
  ngap_filename: /tmp/gnb_ngap.pcap

Expected Behavior

I should see my network in my UE

Actual Behaviour

When trying to use my gps (by setting clock and sync to gpsdo), I've got the error:

Could not lock reference clock source.
srsRAN ERROR: Unable to create radio session.

I've got in my terminal some [DEBUG] [AD936X] baseband bandwidth too large for current sample rate. Setting bandwidth to: 5e+07 but it's impossible to manually set the bandwidth to 50Mhz (srate to weak) which is a strange behavior. I can't increase my srate neither because it seems like it needs to be equal to the clockrate and my clockrate is limited to 30.72 Mhz (I tried to overcome this problem by using the GPS but as stated before it isn't working). My ideal configuration would be to use a frequency of 4005 Mhz with a 20 Mhz bandwidth and I don't really care (for now) about the srate.

Additional Information

Here is the "complete" trace of execution of gnb

ubuntu@ubuntu:~/srsRAN_Project$ sudo ./build/apps/gnb/gnb -c configs/gnb_E316.yml

--== srsRAN gNB (commit 9d5dd74) ==--

The PRACH detector will not meet the performance requirements with the configuration {Format 0, ZCZ 0, SCS 1.25kHz, Rx ports 1}.
Lower PHY in quad executor mode.
Available radio types: uhd.
[INFO] [UHD] linux; GNU C++ version 11.4.0; Boost_107400; UHD_4.1.0.0-0-b90c92a8
[INFO] [LOGGING] Fastpath logging disabled at runtime.
Making USRP object with args 'type=ant,num_recv_frames=64,num_send_frames=64,master_clock_rate=30.72e6'
[INFO] [ANT] Detected Device: ANTSDR
[INFO] [ANT] Detecting internal GPSDO....
[INFO] [GPS] Found a generic NMEA GPS device
[INFO] [ANT] Initialize CODEC control...
[INFO] [ANT] Initialize Radio control...
[DEBUG] [AD936X] baseband bandwidth too large for current sample rate. Setting bandwidth to: 5e+07
[DEBUG] [AD936X] baseband bandwidth too large for current sample rate. Setting bandwidth to: 5e+07
[DEBUG] [AD936X] baseband bandwidth too large for current sample rate. Setting bandwidth to: 5e+07
[DEBUG] [AD936X] baseband bandwidth too large for current sample rate. Setting bandwidth to: 5e+07
[DEBUG] [AD936X] baseband bandwidth too large for current sample rate. Setting bandwidth to: 5e+07
[DEBUG] [AD936X] baseband bandwidth too large for current sample rate. Setting bandwidth to: 5e+07
[DEBUG] [AD936X] baseband bandwidth too large for current sample rate. Setting bandwidth to: 5e+07
[DEBUG] [AD936X] baseband bandwidth too large for current sample rate. Setting bandwidth to: 5e+07
[INFO] [ANT] Performing register loopback test...
[INFO] [ANT] Register loopback test passed
[INFO] [ANT] Performing register loopback test...
[INFO] [ANT] Register loopback test passed
[DEBUG] [AD936X] Performing CODEC loopback test...
[DEBUG] [AD936X] CODEC loopback test passed.
[DEBUG] [AD936X] Performing CODEC loopback test...
[DEBUG] [AD936X] CODEC loopback test passed.
[INFO] [ANT] Asking for clock rate 30.720000 MHz...
[INFO] [ANT] Actually got clock rate 30.720000 MHz.
[DEBUG] [CORES] Performing timer loopback test...
[DEBUG] [CORES] Timer loopback test passed.
[DEBUG] [CORES] Performing timer loopback test...
[DEBUG] [CORES] Timer loopback test passed.
[INFO] [MULTI_USRP] 1) catch time transition at pps edge
[INFO] [MULTI_USRP] 2) set times next pps (synchronously)
[DEBUG] [CONVERT] get_converter: For converter ID: conversion ID
Input format: fc32
Num inputs: 1
Output format: sc12_item32_le
Num outputs: 1
Using prio: 0
[DEBUG] [CONVERT] get_converter: For converter ID: conversion ID
Input format: fc32
Num inputs: 1
Output format: sc12_item32_le
Num outputs: 1
Using prio: 0
[DEBUG] [CONVERT] get_converter: For converter ID: conversion ID
Input format: sc12_item32_le
Num inputs: 1
Output format: fc32
Num outputs: 1
Using prio: 0
[DEBUG] [CONVERT] get_converter: For converter ID: conversion ID
Input format: sc12_item32_le
Num inputs: 1
Output format: fc32
Num outputs: 1
Using prio: 0
Cell pci=1, bw=10 MHz, 2T2R, dl_arfcn=667000 (n77), dl_freq=4005.0 MHz, dl_ssb_arfcn=667008, ul_freq=4005.0 MHz

N2: Connection to AMF on 127.0.0.5:38412 completed
^CCould not stop application after 5 seconds. Forcing exit.
Killed