LimeSDR, GSM with omso

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That actually looks like a low gain version of what I first got: OpenBTS 1st test
The solution then was to use the switches: osmo-trx -f -e
Then preferred was: osmo-trx -f -s4 -b4

For the new version, -f is, ah I think, this C0 Filler Table in the vty (telnet 0 4237)

OsmoTRX> show trx
TRX Config:
 Local IP: 127.0.0.1
 Remote IP: 127.0.0.1
 TRX Base Port: 5700
 Device args: (null)
 Tx Samples-per-Symbol: 4                     <--   -s4
 Rx Samples-per-Symbol: 4                    <--   -s4
 Test Mode: TSC: 0 (Disabled)
 Test Mode: RACH Delay: 0 (Disabled)
 C0 Filler Table: Disabled                        <-- should be Enabled for OpenBTS
 Clock Reference: internal
 Multi-Carrier: Disabled
 Tuning offset: 0.000000
 RSSI to dBm offset: 0.000000
 Swap channels: Disabled
 EDGE support: Disabled                        <--  -e
 Real Time Priority: 0 (Disabled)
 Channels: 1
  Channel 0:
   Rx Path: LNAW
   Tx Path: BAND1
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