Merge pull request #19 from anarkiwi/doc2

Update README.md

README.md

@@ -15,7 +15,7 @@ and to install [docker with GPU support](https://docs.nvidia.com/datacenter/clou
 
 NOTE: If you do not need inference, omit ```-f torchserve-cuda.yml``` in the commands below, and set ```TORCHSERVE``` to a blank string.
 
-## Standalone scenario
+## Single host operation
 
 ```
           +------------+
@@ -34,6 +34,14 @@ In this scenario, the complete GamutRF system is run on one machine, typically a
 
 Once the system is up and running, sample recording and frequency ranges can be controlled from the Waterfall UI.
 
+### Stare mode
+
+Scanning can be disabled such that GamutRF looks at only one frequency continuously. To configure this mode, set ```FREQ_START``` (or use the Waterfall UI) to the lowest frequency to be observed, and ```FREQ_END``` to 0. GamutRF will monitor from ```FREQ_START``` to ```FREQ_START``` plus GamutRF's sample rate (by default 20.48Msps).
+
+### Recording samples
+
+Recording samples is also managed from the Waterfall UI. Enter the number of samples to record (for example, ```20048000``` will record one second's worth of samples at the default sample rate. A recording accompanied by a [SigMF](https://github.com/sigmf/SigMF) file under ```VOL_PREFIX```.
+
 ## Troubleshooting
 
 ### SoapySDR errors allocating buffers
@@ -42,16 +50,16 @@ Run ```echo 0 > /sys/module/usbcore/parameters/usbfs_memory_mb``` as root before
 
 ### Containers won't start using Ettus SDRs
 
-#### ```[ERROR] [USB] USB open failed: insufficient permissions```
+##### ```[ERROR] [USB] USB open failed: insufficient permissions```
 
 Ettus SDRs download firmware and switch USB identities when first powered up. Restart the affected container to work around this (if run with docker compose, restart will happen automatically).
 
-#### ```[ERROR] [UHD] An unexpected exception was caught in a task loop.The task loop will now exit, things may not work.boost: mutex lock failed in pthread_mutex_lock: Invalid argument```
+##### ```[ERROR] [UHD] An unexpected exception was caught in a task loop.The task loop will now exit, things may not work.boost: mutex lock failed in pthread_mutex_lock: Invalid argument```
 
 UHD driver arguments ```num_recv_frames``` or ```recv_frame_size``` may be too high. The defaults are defined as ETTUS_ARGS in [utils.py](https://github.com/IQTLabs/gamutRF/blob/main/gamutrf/utils.py)
 . Try reducing one or both via ```--sdrargs```. For example, ```--sdrargs num_recv_frames=64,recv_frame_size=8200,type=b200```.
 
-#### ```[ERROR] [UHD] EnvironmentError: IOError: usb rx6 transfer status: LIBUSB_TRANSFER_OVERFLOW```
+##### ```[ERROR] [UHD] EnvironmentError: IOError: usb rx6 transfer status: LIBUSB_TRANSFER_OVERFLOW```
 
 Stop containers, and reset the Ettus as follows: