LimeSDR USB parameter help

[Barry Duggan]

I have been trying to help a newbie get a broadcast FM receiver working 
with a LimeSDR USB.
The OS is ubuntu 18.04; gnuradio version is 3.8.0.0
The user has loaded 
https://github.com/myriadrf/gr-limesdr/blob/master/examples/FM_receiver.grc
but it is built for GR 3.7

* should it work for GR 3.8?
Right now the Frequency sink just shows random noise.

* are there any other working examples for GR 3.8 available?

Here is output from the console:

LimeSuite Source (RX) info
##################
LimeSuite version: 19.04.1-ga5b3a10f
gr-limesdr version: 3.0.0.0
##################
Device list:
Nr.:0 device:LimeSDR-USB, media=USB 3.0, module=FX3, addr=1d50:6108, 
serial=0009081C05C13425
##################
INFO: device_handler::enable_channels(): SISO CH0 set for device number 
0.
INFO: device_handler::set_samp_rate(): set sampling rate: 2 MS/s.
INFO: device_handler::set_rf_freq(): RF frequency set [RX]: 88.1 MHz.
INFO: device_handler::set_analog_filter(): RX LPF configured
INFO: device_handler::set_digital_filter(): digital filter CH0 [RX]: 1.8 
MHz.
INFO: device_handler::set_gain(): set gain [RX] CH0: 30 dB.
INFO: device_handler::set_antenna(): CH0 antenna set [RX]: LNAL.
INFO: device_handler::calibrate(): Rx calibration finished

On the "Properties: LimeSDR Source (RX)" screen:

Channel A Properties:
  NCO frequency
  Calibration bandwidth
  LNA path
  Analog filter bandwidth
  Digital filter bandwidth
  Gain (dB)

* What should these parameters be set to?

* is the output signal centered at the RF frequency, or is there an 
offset?

on the board there are RX1_L, RX_H, RX_W, RX2_L, RX2_H, RX2_W connectors
INFO: device_handler::set_antenna(): CH0 antenna set [RX]: LNAL.
* which connector corresponds to LNAL? Is it RX1_L?

Any help will be much appreciated!
--
Barry Duggan KV4FV