diff --git a/swagger/sdrangel/examples/Readme.md b/swagger/sdrangel/examples/Readme.md
index e50d1dd92..d367e37e5 100644
--- a/swagger/sdrangel/examples/Readme.md
+++ b/swagger/sdrangel/examples/Readme.md
@@ -64,6 +64,12 @@ It uses the following APIs:
     - URI: `/sdrangel/deviceset/{deviceSetIndex}/device/run`
     - HTTP method: `POST`
   
+<h2>nfm_scanner.py</h2>
+  
+Simple NFM scanner with multiple equally spaced NFM channels. Stops whenever any of the channels squelch opens.
+
+Requires numpy
+  
 <h2>nfm_test.py</h2>
 
 Example of creating NFM channels (demodulator and modulator) and changing the settings
@@ -125,6 +131,53 @@ It uses the following APIs:
     - URI: `/sdrangel/deviceset/{deviceSetIndex}/device/settings`
     - HTTP method: `PATCH`
 
+<h2>rx_test.py</h2>
+
+Sets specified Rx in existing source device set or create a new source device set with this Rx. Adds an NFM demodulator channel.
+
+It uses the following APIs:
+
+  - Create a new device set:
+    - Operation ID: `devicesetPost`
+    - URI: `/sdrangel/deviceset`  
+    - HTTP method: `POST`
+  - Get information on a device set:
+    - Operation ID: `devicesetGet`
+    - URI: `/sdrangel/deviceset/{deviceSetIndex}`
+    - HTTP method: `GET`
+  - To select a device in a device set:
+    - Operation ID: `devicesetDevicePut`
+    - URI: `/sdrangel/deviceset/{deviceSetIndex}/device`
+    - HTTP method: `PUT`
+  - To get the settings of a device:
+    - OperationID: `devicesetDeviceSettingsGet`
+    - URI: `/sdrangel/deviceset/{deviceSetIndex}/device/settings`
+    - HTTP method: `GET`
+  - To change the settings of a device:
+    - OperationID: `devicesetDeviceSettingsPatch`
+    - URI: `/sdrangel/deviceset/{deviceSetIndex}/device/settings`
+    - HTTP method: `PATCH`
+  - To create a new channel:
+    - Operation ID: `devicesetChannelPost`
+    - URI: `/sdrangel/deviceset/{deviceSetIndex}/channel`
+    - HTTP method: `POST`
+  - To get the settings of a channel:
+    - OperationID: `devicesetChannelSettingsGet`
+    - URI: `/sdrangel/deviceset/{deviceSetIndex}/channel/{channelIndex}/settings`
+    - HTTP method: `GET`
+  - To change the settings of a channel:
+    - OperationID: `devicesetChannelSettingsPatch`
+    - URI: `/sdrangel/deviceset/{deviceSetIndex}/channel/{channelIndex}/settings`
+    - HTTP method: `PATCH`
+  - Start a device streaming
+    - OperationID: `devicesetDeviceRunPost`
+    - URI: `/sdrangel/deviceset/{deviceSetIndex}/device/run`
+    - HTTP method: `POST`
+   
+<h2>rx_tx_test.py</h2>
+
+Combines `rx_test` and `tx_test` to create a pair of source and sink device sets. The APIs used are the same as in `rx_test` or `tx_test`.   
+
 <h2>start_stop.py</h2>
 
 Starts or stops a device in the specified device set
@@ -155,4 +208,45 @@ It uses this API:
     - URI: `/sdrangel`
     - HTTP method: `DELETE`
 
-  
\ No newline at end of file
+<h2>tx_test.py</h2>
+
+Sets specified Tx in existing sink device set or create a new sink device set with this Tx. Adds an NFM modulator channel.
+
+It uses the following APIs:
+
+  - Create a new device set:
+    - Operation ID: `devicesetPost`
+    - URI: `/sdrangel/deviceset`  
+    - HTTP method: `POST`
+  - Get information on a device set:
+    - Operation ID: `devicesetGet`
+    - URI: `/sdrangel/deviceset/{deviceSetIndex}`
+    - HTTP method: `GET`
+  - To select a device in a device set:
+    - Operation ID: `devicesetDevicePut`
+    - URI: `/sdrangel/deviceset/{deviceSetIndex}/device`
+    - HTTP method: `PUT`
+  - To get the settings of a device:
+    - OperationID: `devicesetDeviceSettingsGet`
+    - URI: `/sdrangel/deviceset/{deviceSetIndex}/device/settings`
+    - HTTP method: `GET`
+  - To change the settings of a device:
+    - OperationID: `devicesetDeviceSettingsPatch`
+    - URI: `/sdrangel/deviceset/{deviceSetIndex}/device/settings`
+    - HTTP method: `PATCH`
+  - To create a new channel:
+    - Operation ID: `devicesetChannelPost`
+    - URI: `/sdrangel/deviceset/{deviceSetIndex}/channel`
+    - HTTP method: `POST`
+  - To get the settings of a channel:
+    - OperationID: `devicesetChannelSettingsGet`
+    - URI: `/sdrangel/deviceset/{deviceSetIndex}/channel/{channelIndex}/settings`
+    - HTTP method: `GET`
+  - To change the settings of a channel:
+    - OperationID: `devicesetChannelSettingsPatch`
+    - URI: `/sdrangel/deviceset/{deviceSetIndex}/channel/{channelIndex}/settings`
+    - HTTP method: `PATCH`
+  - Start a device streaming
+    - OperationID: `devicesetDeviceRunPost`
+    - URI: `/sdrangel/deviceset/{deviceSetIndex}/device/run`
+    - HTTP method: `POST`
diff --git a/swagger/sdrangel/examples/nfm_scanner.py b/swagger/sdrangel/examples/nfm_scanner.py
new file mode 100644
index 000000000..fe90c0a9b
--- /dev/null
+++ b/swagger/sdrangel/examples/nfm_scanner.py
@@ -0,0 +1,143 @@
+#!/usr/bin/env python
+
+import requests, json, traceback, sys
+from optparse import OptionParser
+import time
+import numpy as np
+
+base_url = "http://127.0.0.1:8091/sdrangel"
+deviceset_url = ""
+
+requests_methods = {
+    "GET": requests.get,
+    "PATCH": requests.patch,
+    "POST": requests.post,
+    "PUT": requests.put,
+    "DELETE": requests.delete
+}
+
+class ScanControl:
+    def __init__(self, num_channels, channel_step, start_freq, stop_freq, log2_decim):        
+        self.channel_shifts = []
+        if num_channels < 2:
+            self.channel_shifts = [0]
+            limit = 0
+        else:
+            limit = ((num_channels-1)*channel_step) / 2
+            self.channel_shifts = list(np.linspace(-limit, limit, num_channels))
+        self.device_start_freq = start_freq + limit 
+        self.device_stop_freq = stop_freq - limit
+        self.device_step_freq = 2*limit + channel_step
+        self.device_sample_rate = (2*limit + channel_step)*(1<<log2_decim)
+
+# ======================================================================
+def getInputOptions():
+
+    parser = OptionParser(usage="usage: %%prog [-t]\n")
+    parser.add_option("-a", "--address", dest="address", help="address and port", metavar="ADDRESS", type="string") 
+    parser.add_option("-d", "--device-index", dest="device_index", help="device set index", metavar="INDEX", type="int", default=0) 
+    parser.add_option("-D", "--device-hwid", dest="device_hwid", help="device hardware id", metavar="HWID", type="string", default="RTLSDR") 
+    parser.add_option("-l", "--log2-decim", dest="log2_decim", help="log2 of the desired software decimation factor", metavar="LOG2", type="int", default=4) 
+    parser.add_option("-n", "--num-channels", dest="num_channels", help="number of parallel channels", metavar="NUMBER", type="int", default=8) 
+    parser.add_option("-s", "--freq-step", dest="freq_step", help="frequency step (Hz)", metavar="FREQUENCY", type="int", default=12500) 
+    parser.add_option("-S", "--freq-start", dest="freq_start", help="frequency start (Hz)", metavar="FREQUENCY", type="int", default=446006250) 
+    parser.add_option("-T", "--freq-stop", dest="freq_stop", help="frequency stop (Hz)", metavar="FREQUENCY", type="int", default=446193750) 
+    parser.add_option("-b", "--af-bw", dest="af_bw", help="audio babdwidth (kHz)", metavar="FREQUENCY_KHZ", type="int" ,default=3) 
+    parser.add_option("-r", "--rf-bw", dest="rf_bw", help="RF babdwidth (Hz). Sets to nearest available", metavar="FREQUENCY", type="int", default=10000) 
+    parser.add_option("-c", "--create", dest="create", help="create a new device set", metavar="BOOLEAN", action="store_true", default=False)
+    parser.add_option("-m", "--mock", dest="mock", help="just print calculated values and exit", metavar="BOOLEAN", action="store_true", default=False)
+
+    (options, args) = parser.parse_args()
+    
+    if (options.address == None):
+        options.address = "127.0.0.1:8091"
+    
+    return options
+
+# ======================================================================
+def printResponse(response):
+    content_type = response.headers.get("Content-Type", None)
+    if content_type is not None:
+        if "application/json" in content_type:
+            print(json.dumps(response.json(), indent=4, sort_keys=True))
+        elif "text/plain" in content_type:
+            print(response.text)
+
+# ======================================================================
+def callAPI(url, method, params, json, text):
+    request_method = requests_methods.get(method, None)
+    if request_method is not None:
+        r = request_method(url=base_url+url, params=params, json=json)
+        if r.status_code / 100 == 2:
+            print(text + " succeeded")
+            printResponse(r)
+            return r.json() # all 200 yield application/json response
+        else:
+            print(text + " failed")
+            printResponse(r)
+            return None
+
+# ======================================================================
+def main():
+    try:
+        options = getInputOptions()
+        scan_control = ScanControl(options.num_channels, options.freq_step, options.freq_start, options.freq_stop, options.log2_decim)
+        
+        print("Channel shifts: %s" % scan_control.channel_shifts)
+        print("Sample rate: %d" % scan_control.device_sample_rate)
+        print("Start: %d" % scan_control.device_start_freq)
+        print("Stop: %d" % scan_control.device_stop_freq)
+        print("Step: %d" % scan_control.device_step_freq)
+        
+        if scan_control.device_stop_freq < scan_control.device_start_freq:
+            print("Frequency error")
+            exit(1)
+        
+        if options.mock:
+            freqs = []
+            fc = scan_control.device_start_freq
+            while fc <= scan_control.device_stop_freq:
+                freqs += [x+fc for x in scan_control.channel_shifts]
+                fc += scan_control.device_step_freq            
+            print("Scanned frequencies: %s" % freqs)
+            exit(0)
+        
+        global base_url
+        base_url = "http://%s/sdrangel" % options.address
+        
+        # Set Rx
+        
+        if options.create:
+            r = callAPI("/deviceset", "POST", {"tx": 0}, None, "Add Rx device set")
+            if r is None:
+                exit(-1)
+            
+        global deviceset_url
+        deviceset_url = "/deviceset/%d" % options.device_index
+
+        r = callAPI(deviceset_url + "/device", "PUT", None, {"hwType": "%s" % options.device_hwid, "tx": 0}, "setup device on Rx device set")
+        if r is None:
+            exit(-1)
+        
+        
+        
+        settings = callAPI("/deviceset/0/channel", "POST", None, {"channelType": "NFMDemod", "tx": 0}, "Create NFM demod")
+        if settings is None:
+            exit(-1)
+
+        settings["NFMDemodSettings"]["inputFrequencyOffset"] = 12500
+        settings["NFMDemodSettings"]["afBandwidth"] = 5000
+        
+        r = callAPI("/deviceset/0/channel/0/settings", "PATCH", None, settings, "Change NFM demod")
+        if r is None:
+            exit(-1)
+            
+        
+    except Exception, msg:
+        tb = traceback.format_exc()
+        print >> sys.stderr, tb
+
+
+if __name__ == "__main__":
+    main()
+