diff --git a/config_webrx.py b/config_webrx.py
index fdeb979..2134508 100644
--- a/config_webrx.py
+++ b/config_webrx.py
@@ -340,6 +340,27 @@ aprs_igate_beacon = False
 # path to the aprs symbols repository (get it here: https://github.com/hessu/aprs-symbols)
 aprs_symbols_path = "/usr/share/aprs-symbols/png"
 
+# Uncomment the following to customize gateway beacon details reported to the aprs network
+#   Plese see Dire Wolf's documentation on PBEACON configuration for complete details:
+#   https://github.com/wb2osz/direwolf/raw/master/doc/User-Guide.pdf 
+
+# Symbol in its two-character form as specified by the APRS spec at http://www.aprs.org/symbols/symbols-new.txt
+#   Default: Receive only IGate (do not send msgs back to RF)  
+# aprs_igate_symbol = "R&"
+
+# Custom comment about igate 
+#   Default: OpenWebRX APRS gateway
+# aprs_igate_comment = "OpenWebRX APRS gateway"
+
+# Antenna Height and Gain details
+#   Unspecified by default
+# Antenna height above average terrain (HAAT) in meters 
+# aprs_igate_height = "5"
+# Antenna gain in dBi
+# aprs_igate_gain = "0"
+# Antenna direction (N, NE, E, SE, S, SW, W, NW).  Omnidirectional by default
+# aprs_igate_dir = "NE"
+
 # === PSK Reporter setting ===
 # enable this if you want to upload all ft8, ft4 etc spots to pskreporter.info
 # this also uses the receiver_gps setting from above, so make sure it contains a correct locator
diff --git a/htdocs/css/openwebrx.css b/htdocs/css/openwebrx.css
index 2997348..05cfcbf 100644
--- a/htdocs/css/openwebrx.css
+++ b/htdocs/css/openwebrx.css
@@ -551,13 +551,25 @@ img.openwebrx-mirror-img
     -khtml-user-select: none;
     -moz-user-select: none;
     -ms-user-select: none;
+    overflow: hidden;
 }
 
-.openwebrx-progressbar-bar
-{
+.openwebrx-progressbar-bar {
+	background-color: #00aba6;
 	border-radius: 5px;
 	height: 100%;
 	width: 100%;
+	position: absolute;
+	left: -100%;
+	transition-property: left,background-color;
+	transition-duration: 1s;
+	transition-timing-function: ease-in-out;
+	transform: translateZ(0);
+	will-change: left;
+}
+
+.openwebrx-progressbar--over .openwebrx-progressbar-bar {
+    background-color: #ff6262;
 }
 
 .openwebrx-progressbar-text
@@ -566,6 +578,7 @@ img.openwebrx-mirror-img
 	left:0px;
 	top:4px;
 	width: inherit;
+	z-index: 1;
 }
 
 #openwebrx-panel-status
diff --git a/htdocs/lib/DemodulatorPanel.js b/htdocs/lib/DemodulatorPanel.js
index 22a86f3..2cdca68 100644
--- a/htdocs/lib/DemodulatorPanel.js
+++ b/htdocs/lib/DemodulatorPanel.js
@@ -4,6 +4,7 @@ function DemodulatorPanel(el) {
     self.demodulator = null;
     self.mode = null;
     self.squelchMargin = 10;
+    self.initialParams = {};
 
     var displayEl = el.find('.webrx-actual-freq')
     this.tuneableFrequencyDisplay = displayEl.tuneableFrequencyDisplay();
@@ -180,7 +181,7 @@ DemodulatorPanel.prototype.collectParams = function() {
         squelch_level: -150,
         mod: 'nfm'
     }
-    return $.extend(new Object(), defaults, this.initialParams || {}, this.transformHashParams(this.parseHash()));
+    return $.extend(new Object(), defaults, this.initialParams, this.transformHashParams(this.parseHash()));
 };
 
 DemodulatorPanel.prototype.startDemodulator = function() {
@@ -206,7 +207,7 @@ DemodulatorPanel.prototype._apply = function(params) {
 };
 
 DemodulatorPanel.prototype.setInitialParams = function(params) {
-    this.initialParams = params;
+    $.extend(this.initialParams, params);
 };
 
 DemodulatorPanel.prototype.onHashChange = function() {
diff --git a/htdocs/lib/ProgressBar.js b/htdocs/lib/ProgressBar.js
index 691d2ff..71b1754 100644
--- a/htdocs/lib/ProgressBar.js
+++ b/htdocs/lib/ProgressBar.js
@@ -3,7 +3,6 @@ ProgressBar = function(el) {
     this.$innerText = $('<span class="openwebrx-progressbar-text">' + this.getDefaultText() + '</span>');
     this.$innerBar = $('<div class="openwebrx-progressbar-bar"></div>');
     this.$el.empty().append(this.$innerText, this.$innerBar);
-    this.$innerBar.css('width', '0%');
 };
 
 ProgressBar.prototype.getDefaultText = function() {
@@ -19,7 +18,7 @@ ProgressBar.prototype.set = function(val, text, over) {
 ProgressBar.prototype.setValue = function(val) {
     if (val < 0) val = 0;
     if (val > 1) val = 1;
-    this.$innerBar.stop().animate({width: val * 100 + '%'}, 700);
+    this.$innerBar.css({left: (val - 1) * 100 + '%'});
 };
 
 ProgressBar.prototype.setText = function(text) {
@@ -27,7 +26,7 @@ ProgressBar.prototype.setText = function(text) {
 };
 
 ProgressBar.prototype.setOver = function(over) {
-    this.$innerBar.css('backgroundColor', (over) ? "#ff6262" : "#00aba6");
+    this.$el[over ? 'addClass' : 'removeClass']('openwebrx-progressbar--over');
 };
 
 AudioBufferProgressBar = function(el) {
diff --git a/htdocs/openwebrx.js b/htdocs/openwebrx.js
index 4ca7b49..594f0b5 100644
--- a/htdocs/openwebrx.js
+++ b/htdocs/openwebrx.js
@@ -314,14 +314,16 @@ function scale_px_from_freq(f, range) {
 }
 
 function get_visible_freq_range() {
-    var out = {};
+    if (!bandwidth) return false;
     var fcalc = function (x) {
         var canvasWidth = waterfallWidth() * zoom_levels[zoom_level];
         return Math.round(((-zoom_offset_px + x) / canvasWidth) * bandwidth) + (center_freq - bandwidth / 2);
     };
-    out.start = fcalc(0);
-    out.center = fcalc(waterfallWidth() / 2);
-    out.end = fcalc(waterfallWidth());
+    var out = {
+        start: fcalc(0),
+        center: fcalc(waterfallWidth() / 2),
+        end: fcalc(waterfallWidth()),
+    }
     out.bw = out.end - out.start;
     out.hps = out.bw / waterfallWidth();
     return out;
@@ -426,6 +428,7 @@ var range;
 function mkscale() {
     //clear the lower part of the canvas (where frequency scale resides; the upper part is used by filter envelopes):
     range = get_visible_freq_range();
+    if (!range) return;
     mkenvelopes(range); //when scale changes we will always have to redraw filter envelopes, too
     scale_ctx.clearRect(0, 22, scale_ctx.canvas.width, scale_ctx.canvas.height - 22);
     scale_ctx.strokeStyle = "#fff";
@@ -442,9 +445,7 @@ function mkscale() {
     };
     var last_large;
     var x;
-    for (; ;) {
-        x = scale_px_from_freq(marker_hz, range);
-        if (x > window.innerWidth) break;
+    while ((x = scale_px_from_freq(marker_hz, range)) <= window.innerWidth) {
         scale_ctx.beginPath();
         scale_ctx.moveTo(x, 22);
         if (marker_hz % spacing.params.large_marker_per_hz === 0) {  //large marker
@@ -700,41 +701,60 @@ function on_ws_recv(evt) {
                 switch (json.type) {
                     case "config":
                         var config = json['value'];
-                        waterfall_colors = buildWaterfallColors(config['waterfall_colors']);
-                        waterfall_min_level_default = config['waterfall_min_level'];
-                        waterfall_max_level_default = config['waterfall_max_level'];
-                        waterfall_auto_level_margin = config['waterfall_auto_level_margin'];
+                        if ('waterfall_colors' in config)
+                            waterfall_colors = buildWaterfallColors(config['waterfall_colors']);
+                        if ('waterfall_min_level' in config)
+                            waterfall_min_level_default = config['waterfall_min_level'];
+                        if ('waterfall_max_level' in config)
+                            waterfall_max_level_default = config['waterfall_max_level'];
+                        if ('waterfall_auto_level_margin' in config)
+                            waterfall_auto_level_margin = config['waterfall_auto_level_margin'];
                         waterfallColorsDefault();
 
-                        var initial_demodulator_params = {
-                            mod: config['start_mod'],
-                            offset_frequency: config['start_offset_freq'],
-                            squelch_level: Number.isInteger(config['initial_squelch_level']) ? config['initial_squelch_level'] : -150
-                        };
+                        var initial_demodulator_params = {};
+                        if ('start_mod' in config)
+                            initial_demodulator_params['mod'] = config['start_mod'];
+                        if ('start_offset_freq' in config)
+                            initial_demodulator_params['offset_frequency'] = config['start_offset_freq'];
+                        if ('initial_squelch_level' in config)
+                            initial_demodulator_params['squelch_level'] = Number.isInteger(config['initial_squelch_level']) ? config['initial_squelch_level'] : -150;
 
-                        bandwidth = config['samp_rate'];
-                        center_freq = config['center_freq'];
-                        fft_size = config['fft_size'];
-                        var audio_compression = config['audio_compression'];
-                        audioEngine.setCompression(audio_compression);
-                        divlog("Audio stream is " + ((audio_compression === "adpcm") ? "compressed" : "uncompressed") + ".");
-                        fft_compression = config['fft_compression'];
-                        divlog("FFT stream is " + ((fft_compression === "adpcm") ? "compressed" : "uncompressed") + ".");
-                        $('#openwebrx-bar-clients').progressbar().setMaxClients(config['max_clients']);
+                        if ('samp_rate' in config)
+                            bandwidth = config['samp_rate'];
+                        if ('center_freq' in config)
+                            center_freq = config['center_freq'];
+                        if ('fft_size' in config)
+                            fft_size = config['fft_size'];
+                        if ('audio_compression' in config) {
+                            var audio_compression = config['audio_compression'];
+                            audioEngine.setCompression(audio_compression);
+                            divlog("Audio stream is " + ((audio_compression === "adpcm") ? "compressed" : "uncompressed") + ".");
+                        }
+                        if ('fft_compression' in config) {
+                            fft_compression = config['fft_compression'];
+                            divlog("FFT stream is " + ((fft_compression === "adpcm") ? "compressed" : "uncompressed") + ".");
+                        }
+                        if ('max_clients' in config)
+                            $('#openwebrx-bar-clients').progressbar().setMaxClients(config['max_clients']);
 
                         waterfall_init();
+
                         var demodulatorPanel = $('#openwebrx-panel-receiver').demodulatorPanel();
                         demodulatorPanel.setCenterFrequency(center_freq);
                         demodulatorPanel.setInitialParams(initial_demodulator_params);
-                        demodulatorPanel.setSquelchMargin(config['squelch_auto_margin']);
+                        if ('squelch_auto_margin' in config)
+                            demodulatorPanel.setSquelchMargin(config['squelch_auto_margin']);
                         bookmarks.loadLocalBookmarks();
 
+                        if ('sdr_id' in config && 'profile_id' in config) {
+                            currentprofile = config['sdr_id'] + '|' + config['profile_id'];
+                            $('#openwebrx-sdr-profiles-listbox').val(currentprofile);
+                        }
+
                         waterfall_clear();
 
-                        currentprofile = config['sdr_id'] + '|' + config['profile_id'];
-                        $('#openwebrx-sdr-profiles-listbox').val(currentprofile);
-
-                        $('#openwebrx-panel-receiver').demodulatorPanel().setFrequencyPrecision(config['frequency_display_precision']);
+                        if ('frequency_display_precision' in config)
+                            $('#openwebrx-panel-receiver').demodulatorPanel().setFrequencyPrecision(config['frequency_display_precision']);
 
                         break;
                     case "secondary_config":
diff --git a/owrx/bands.py b/owrx/bands.py
index fbb7ae6..89bf293 100644
--- a/owrx/bands.py
+++ b/owrx/bands.py
@@ -1,3 +1,4 @@
+from owrx.modes import Modes
 import json
 
 import logging
@@ -12,7 +13,15 @@ class Band(object):
         self.upper_bound = dict["upper_bound"]
         self.frequencies = []
         if "frequencies" in dict:
+            availableModes = [mode.modulation for mode in Modes.getAvailableModes()]
             for (mode, freqs) in dict["frequencies"].items():
+                if mode not in availableModes:
+                    logger.info(
+                        "Modulation \"{mode}\" is not available, bandplan bookmark will not be displayed".format(
+                            mode=mode
+                        )
+                    )
+                    continue
                 if not isinstance(freqs, list):
                     freqs = [freqs]
                 for f in freqs:
@@ -22,8 +31,8 @@ class Band(object):
                                 mode=mode, frequency=f, band=self.name
                             )
                         )
-                    else:
-                        self.frequencies.append({"mode": mode, "frequency": f})
+                        continue
+                    self.frequencies.append({"mode": mode, "frequency": f})
 
     def inBand(self, freq):
         return self.lower_bound <= freq <= self.upper_bound
diff --git a/owrx/connection.py b/owrx/connection.py
index e0893fc..73e1f6d 100644
--- a/owrx/connection.py
+++ b/owrx/connection.py
@@ -12,6 +12,7 @@ from owrx.bookmarks import Bookmarks
 from owrx.map import Map
 from owrx.property import PropertyStack
 from owrx.modes import Modes, DigitalMode
+from owrx.config import Config
 from queue import Queue, Full, Empty
 from js8py import Js8Frame
 from abc import ABC, ABCMeta, abstractmethod
@@ -108,22 +109,26 @@ class OpenWebRxClient(Client, metaclass=ABCMeta):
 
 
 class OpenWebRxReceiverClient(OpenWebRxClient, SdrSourceEventClient):
-    config_keys = [
-        "waterfall_colors",
+    sdr_config_keys = [
+        "waterfall_min_level",
         "waterfall_min_level",
         "waterfall_max_level",
-        "waterfall_auto_level_margin",
         "samp_rate",
-        "fft_size",
-        "audio_compression",
-        "fft_compression",
-        "max_clients",
         "start_mod",
         "start_freq",
         "center_freq",
         "initial_squelch_level",
         "profile_id",
         "squelch_auto_margin",
+    ]
+
+    global_config_keys = [
+        "waterfall_colors",
+        "waterfall_auto_level_margin",
+        "fft_size",
+        "audio_compression",
+        "fft_compression",
+        "max_clients",
         "frequency_display_precision",
     ]
 
@@ -132,7 +137,7 @@ class OpenWebRxReceiverClient(OpenWebRxClient, SdrSourceEventClient):
 
         self.dsp = None
         self.sdr = None
-        self.configSub = None
+        self.sdrConfigSubs = []
         self.connectionProperties = {}
 
         try:
@@ -142,6 +147,10 @@ class OpenWebRxReceiverClient(OpenWebRxClient, SdrSourceEventClient):
             self.close()
             raise
 
+        globalConfig = Config.get().filter(*OpenWebRxReceiverClient.global_config_keys)
+        self.globalConfigSub = globalConfig.wire(self.write_config)
+        self.write_config(globalConfig.__dict__())
+
         self.setSdr()
 
         features = FeatureDetector().feature_availability()
@@ -154,6 +163,10 @@ class OpenWebRxReceiverClient(OpenWebRxClient, SdrSourceEventClient):
 
         CpuUsageThread.getSharedInstance().add_client(self)
 
+    def __del__(self):
+        if hasattr(self, "globalConfigSub"):
+            self.globalConfigSub.cancel()
+
     def onStateChange(self, state):
         if state == SdrSource.STATE_RUNNING:
             self.handleSdrAvailable()
@@ -231,9 +244,8 @@ class OpenWebRxReceiverClient(OpenWebRxClient, SdrSourceEventClient):
 
         self.stopDsp()
 
-        if self.configSub is not None:
-            self.configSub.cancel()
-            self.configSub = None
+        while self.sdrConfigSubs:
+            self.sdrConfigSubs.pop().cancel()
 
         if self.sdr is not None:
             self.sdr.removeClient(self)
@@ -248,31 +260,38 @@ class OpenWebRxReceiverClient(OpenWebRxClient, SdrSourceEventClient):
         self.sdr.addClient(self)
 
     def handleSdrAvailable(self):
-        # send initial config
         self.getDsp().setProperties(self.connectionProperties)
 
         stack = PropertyStack()
         stack.addLayer(0, self.sdr.getProps())
         stack.addLayer(1, Config.get())
-        configProps = stack.filter(*OpenWebRxReceiverClient.config_keys)
+        configProps = stack.filter(*OpenWebRxReceiverClient.sdr_config_keys)
 
-        def sendConfig(key, value):
-            config = configProps.__dict__()
-            # TODO mathematical properties? hmmmm
-            config["start_offset_freq"] = configProps["start_freq"] - configProps["center_freq"]
-            # TODO this is a hack to support multiple sdrs
-            config["sdr_id"] = self.sdr.getId()
+        def sendConfig(changes=None):
+            if changes is None:
+                config = configProps.__dict__()
+            else:
+                config = changes
+            if changes is None or "start_freq" in changes or "center_freq" in changes:
+                config["start_offset_freq"] = configProps["start_freq"] - configProps["center_freq"]
+            if changes is None or "profile_id" in changes:
+                config["sdr_id"] = self.sdr.getId()
             self.write_config(config)
 
+        def sendBookmarks(changes=None):
             cf = configProps["center_freq"]
             srh = configProps["samp_rate"] / 2
             frequencyRange = (cf - srh, cf + srh)
-            self.write_dial_frequendies(Bandplan.getSharedInstance().collectDialFrequencies(frequencyRange))
+            self.write_dial_frequencies(Bandplan.getSharedInstance().collectDialFrequencies(frequencyRange))
             bookmarks = [b.__dict__() for b in Bookmarks.getSharedInstance().getBookmarks(frequencyRange)]
             self.write_bookmarks(bookmarks)
 
-        self.configSub = configProps.wire(sendConfig)
-        sendConfig(None, None)
+        self.sdrConfigSubs.append(configProps.wire(sendConfig))
+        self.sdrConfigSubs.append(stack.filter("center_freq", "samp_rate").wire(sendBookmarks))
+
+        # send initial config
+        sendConfig()
+        sendBookmarks()
         self.__sendProfiles()
 
         self.sdr.addSpectrumClient(self)
@@ -289,9 +308,8 @@ class OpenWebRxReceiverClient(OpenWebRxClient, SdrSourceEventClient):
         self.stopDsp()
         CpuUsageThread.getSharedInstance().remove_client(self)
         ClientRegistry.getSharedInstance().removeClient(self)
-        if self.configSub is not None:
-            self.configSub.cancel()
-            self.configSub = None
+        while self.sdrConfigSubs:
+            self.sdrConfigSubs.pop().cancel()
         super().close()
 
     def stopDsp(self):
@@ -368,7 +386,7 @@ class OpenWebRxReceiverClient(OpenWebRxClient, SdrSourceEventClient):
     def write_wsjt_message(self, message):
         self.send({"type": "wsjt_message", "value": message})
 
-    def write_dial_frequendies(self, frequencies):
+    def write_dial_frequencies(self, frequencies):
         self.send({"type": "dial_frequencies", "value": frequencies})
 
     def write_bookmarks(self, bookmarks):
diff --git a/owrx/cpu.py b/owrx/cpu.py
index 28c9066..6b2b82c 100644
--- a/owrx/cpu.py
+++ b/owrx/cpu.py
@@ -7,11 +7,13 @@ logger = logging.getLogger(__name__)
 
 class CpuUsageThread(threading.Thread):
     sharedInstance = None
+    creationLock = threading.Lock()
 
     @staticmethod
     def getSharedInstance():
-        if CpuUsageThread.sharedInstance is None:
-            CpuUsageThread.sharedInstance = CpuUsageThread()
+        with CpuUsageThread.creationLock:
+            if CpuUsageThread.sharedInstance is None:
+                CpuUsageThread.sharedInstance = CpuUsageThread()
         return CpuUsageThread.sharedInstance
 
     def __init__(self):
@@ -23,6 +25,7 @@ class CpuUsageThread(threading.Thread):
         super().__init__()
 
     def run(self):
+        logger.debug("cpu usage thread starting up")
         while self.doRun:
             try:
                 cpu_usage = self.get_cpu_usage()
diff --git a/owrx/dsp.py b/owrx/dsp.py
index 72e6667..d6bd241 100644
--- a/owrx/dsp.py
+++ b/owrx/dsp.py
@@ -28,35 +28,41 @@ class DspManager(csdr.output, SdrSourceEventClient):
 
         self.props = PropertyStack()
         # local demodulator properties not forwarded to the sdr
-        self.props.addLayer(0, PropertyLayer().filter(
-            "output_rate",
-            "hd_output_rate",
-            "squelch_level",
-            "secondary_mod",
-            "low_cut",
-            "high_cut",
-            "offset_freq",
-            "mod",
-            "secondary_offset_freq",
-            "dmr_filter",
-        ))
+        self.props.addLayer(
+            0,
+            PropertyLayer().filter(
+                "output_rate",
+                "hd_output_rate",
+                "squelch_level",
+                "secondary_mod",
+                "low_cut",
+                "high_cut",
+                "offset_freq",
+                "mod",
+                "secondary_offset_freq",
+                "dmr_filter",
+            ),
+        )
         # properties that we inherit from the sdr
-        self.props.addLayer(1, self.sdrSource.getProps().filter(
-            "audio_compression",
-            "fft_compression",
-            "digimodes_fft_size",
-            "csdr_dynamic_bufsize",
-            "csdr_print_bufsizes",
-            "csdr_through",
-            "digimodes_enable",
-            "samp_rate",
-            "digital_voice_unvoiced_quality",
-            "temporary_directory",
-            "center_freq",
-            "start_mod",
-            "start_freq",
-            "wfm_deemphasis_tau",
-        ))
+        self.props.addLayer(
+            1,
+            self.sdrSource.getProps().filter(
+                "audio_compression",
+                "fft_compression",
+                "digimodes_fft_size",
+                "csdr_dynamic_bufsize",
+                "csdr_print_bufsizes",
+                "csdr_through",
+                "digimodes_enable",
+                "samp_rate",
+                "digital_voice_unvoiced_quality",
+                "temporary_directory",
+                "center_freq",
+                "start_mod",
+                "start_freq",
+                "wfm_deemphasis_tau",
+            ),
+        )
 
         self.dsp = csdr.dsp(self)
         self.dsp.nc_port = self.sdrSource.getPort()
@@ -71,8 +77,13 @@ class DspManager(csdr.output, SdrSourceEventClient):
             bpf[1] = cut
             self.dsp.set_bpf(*bpf)
 
-        def set_dial_freq(key, value):
-            if self.props["center_freq"] is None or self.props["offset_freq"] is None:
+        def set_dial_freq(changes):
+            if (
+                "center_freq" not in self.props
+                or self.props["center_freq"] is None
+                or "offset_freq" not in self.props
+                or self.props["offset_freq"] is None
+            ):
                 return
             freq = self.props["center_freq"] + self.props["offset_freq"]
             for parser in self.parsers.values():
diff --git a/owrx/kiss.py b/owrx/kiss.py
index 440cdab..bb20489 100644
--- a/owrx/kiss.py
+++ b/owrx/kiss.py
@@ -11,6 +11,7 @@ FESC = 0xDB
 TFEND = 0xDC
 TFESC = 0xDD
 
+FEET_PER_METER = 3.28084
 
 class DirewolfConfig(object):
     def getConfig(self, port, is_service):
@@ -39,6 +40,7 @@ IGLOGIN {callsign} {password}
             )
 
             if pm["aprs_igate_beacon"]:
+                #Format beacon lat/lon
                 lat = pm["receiver_gps"]["lat"]
                 lon = pm["receiver_gps"]["lon"]
                 direction_ns = "N" if lat > 0 else "S"
@@ -48,11 +50,33 @@ IGLOGIN {callsign} {password}
                 lat = "{0:02d}^{1:05.2f}{2}".format(int(lat), (lat - int(lat)) * 60, direction_ns)
                 lon = "{0:03d}^{1:05.2f}{2}".format(int(lon), (lon - int(lon)) * 60, direction_we)
 
-                config += """
-PBEACON sendto=IG delay=0:30 every=60:00 symbol="igate" overlay=R lat={lat} long={lon} comment="OpenWebRX APRS gateway"
-                """.format(
-                    lat=lat, lon=lon
-                )
+                #Format beacon details
+                symbol  = str(pm["aprs_igate_symbol"])             if "aprs_igate_symbol"  in pm else "R&"
+                gain    = "GAIN=" + str(pm["aprs_igate_gain"])     if "aprs_igate_gain"    in pm else ""
+                adir    = "DIR=" + str(pm["aprs_igate_dir"])       if "aprs_igate_dir"     in pm else ""
+                comment = str(pm["aprs_igate_comment"])            if "aprs_igate_comment" in pm else "\"OpenWebRX APRS gateway\""
+
+                #Convert height from meters to feet if specified
+                height = ""
+                if "aprs_igate_height" in pm:
+                    try:
+                        height_m = float(pm["aprs_igate_height"])
+                        height_ft = round(height_m * FEET_PER_METER)
+                        height = "HEIGHT=" + str(height_ft)
+                    except:
+                        logger.error("Cannot parse 'aprs_igate_height', expected float: " + str(pm["aprs_igate_height"]))
+
+                if((len(comment) > 0) and ((comment[0] != '"') or (comment[len(comment)-1] != '"'))):
+                    comment = "\"" + comment + "\""
+                elif(len(comment) == 0):
+                    comment = "\"\""
+
+                pbeacon = "PBEACON sendto=IG delay=0:30 every=60:00 symbol={symbol} lat={lat} long={lon} {height} {gain} {adir} comment={comment}".format(
+                    symbol=symbol, lat=lat, lon=lon, height=height, gain=gain, adir=adir, comment=comment )
+
+                logger.info("APRS PBEACON String: " + pbeacon)
+                
+                config += "\n" + pbeacon + "\n"
 
         return config
 
diff --git a/owrx/property/__init__.py b/owrx/property/__init__.py
index f3560fa..23058d2 100644
--- a/owrx/property/__init__.py
+++ b/owrx/property/__init__.py
@@ -71,15 +71,22 @@ class PropertyManager(ABC):
             pass
         return self
 
-    def _fireCallbacks(self, name, value):
+    def _fireCallbacks(self, changes):
+        if not changes:
+            return
         for c in self.subscribers:
             try:
                 if c.getName() is None:
-                    c.call(name, value)
-                elif c.getName() == name:
-                    c.call(value)
-            except Exception as e:
-                logger.exception(e)
+                    c.call(changes)
+            except Exception:
+                logger.exception("exception while firing changes")
+        for name in changes:
+            for c in self.subscribers:
+                try:
+                    if c.getName() == name:
+                        c.call(changes[name])
+                except Exception:
+                    logger.exception("exception while firing changes")
 
 
 class PropertyLayer(PropertyManager):
@@ -97,7 +104,7 @@ class PropertyLayer(PropertyManager):
         if name in self.properties and self.properties[name] == value:
             return
         self.properties[name] = value
-        self._fireCallbacks(name, value)
+        self._fireCallbacks({name: value})
 
     def __dict__(self):
         return {k: v for k, v in self.properties.items()}
@@ -116,10 +123,9 @@ class PropertyFilter(PropertyManager):
         self.props = props
         self.pm.wire(self.receiveEvent)
 
-    def receiveEvent(self, name, value):
-        if name not in self.props:
-            return
-        self._fireCallbacks(name, value)
+    def receiveEvent(self, changes):
+        changesToForward = {name: value for name, value in changes.items() if name in self.props}
+        self._fireCallbacks(changesToForward)
 
     def __getitem__(self, item):
         if item not in self.props:
@@ -157,7 +163,7 @@ class PropertyStack(PropertyManager):
         """
         highest priority = 0
         """
-        self._fireChanges(self._addLayer(priority, pm))
+        self._fireCallbacks(self._addLayer(priority, pm))
 
     def _addLayer(self, priority: int, pm: PropertyManager):
         changes = {}
@@ -165,8 +171,8 @@ class PropertyStack(PropertyManager):
             if key not in self or self[key] != pm[key]:
                 changes[key] = pm[key]
 
-        def eventClosure(name, value):
-            self.receiveEvent(pm, name, value)
+        def eventClosure(changes):
+            self.receiveEvent(pm, changes)
 
         sub = pm.wire(eventClosure)
 
@@ -177,7 +183,7 @@ class PropertyStack(PropertyManager):
     def removeLayer(self, pm: PropertyManager):
         for layer in self.layers:
             if layer["props"] == pm:
-                self._fireChanges(self._removeLayer(layer))
+                self._fireCallbacks(self._removeLayer(layer))
 
     def _removeLayer(self, layer):
         layer["sub"].cancel()
@@ -201,16 +207,11 @@ class PropertyStack(PropertyManager):
         changes = {**changes, **self._addLayer(priority, pm)}
         changes = {k: v for k, v in changes.items() if k not in originalState or originalState[k] != v}
 
-        self._fireChanges(changes)
+        self._fireCallbacks(changes)
 
-    def _fireChanges(self, changes):
-        for k, v in changes.items():
-            self._fireCallbacks(k, v)
-
-    def receiveEvent(self, layer, name, value):
-        if layer != self._getTopLayer(name):
-            return
-        self._fireCallbacks(name, value)
+    def receiveEvent(self, layer, changes):
+        changesToForward = {name: value for name, value in changes.items() if layer == self._getTopLayer(name)}
+        self._fireCallbacks(changesToForward)
 
     def _getTopLayer(self, item):
         layers = [la["props"] for la in sorted(self.layers, key=lambda l: l["priority"])]
diff --git a/owrx/service/__init__.py b/owrx/service/__init__.py
index 5984050..2b52fea 100644
--- a/owrx/service/__init__.py
+++ b/owrx/service/__init__.py
@@ -111,7 +111,7 @@ class ServiceHandler(SdrSourceEventClient):
         for service in services:
             service.stop()
 
-    def onFrequencyChange(self, key, value):
+    def onFrequencyChange(self, changes):
         self.stopServices()
         if not self.source.isAvailable():
             return
diff --git a/owrx/service/schedule.py b/owrx/service/schedule.py
index 8cf4261..141962d 100644
--- a/owrx/service/schedule.py
+++ b/owrx/service/schedule.py
@@ -246,7 +246,7 @@ class ServiceScheduler(SdrSourceEventClient):
         if state == SdrSource.BUSYSTATE_IDLE:
             self.scheduleSelection()
 
-    def onFrequencyChange(self, name, value):
+    def onFrequencyChange(self, changes):
         self.scheduleSelection()
 
     def selectProfile(self):
diff --git a/owrx/source/__init__.py b/owrx/source/__init__.py
index 590b301..5822137 100644
--- a/owrx/source/__init__.py
+++ b/owrx/source/__init__.py
@@ -96,7 +96,7 @@ class SdrSource(ABC):
         return self.commandMapper
 
     @abstractmethod
-    def onPropertyChange(self, name, value):
+    def onPropertyChange(self, changes):
         pass
 
     def wireEvents(self):
diff --git a/owrx/source/connector.py b/owrx/source/connector.py
index 47eec5d..40095b0 100644
--- a/owrx/source/connector.py
+++ b/owrx/source/connector.py
@@ -29,22 +29,22 @@ class ConnectorSource(SdrSource):
             }
         )
 
-    def sendControlMessage(self, prop, value):
-        logger.debug("sending property change over control socket: {0} changed to {1}".format(prop, value))
-        self.controlSocket.sendall("{prop}:{value}\n".format(prop=prop, value=value).encode())
+    def sendControlMessage(self, changes):
+        for prop, value in changes.items():
+            logger.debug("sending property change over control socket: {0} changed to {1}".format(prop, value))
+            self.controlSocket.sendall("{prop}:{value}\n".format(prop=prop, value=value).encode())
 
-    def onPropertyChange(self, prop, value):
+    def onPropertyChange(self, changes):
         if self.monitor is None:
             return
         if (
-            (prop == "center_freq" or prop == "lfo_offset")
+            ("center_freq" in changes or "lfo_offset" in changes)
             and "lfo_offset" in self.sdrProps
             and self.sdrProps["lfo_offset"] is not None
         ):
-            freq = self.sdrProps["center_freq"] + self.sdrProps["lfo_offset"]
-            self.sendControlMessage("center_freq", freq)
-        else:
-            self.sendControlMessage(prop, value)
+            changes["center_freq"] = self.sdrProps["center_freq"] + self.sdrProps["lfo_offset"]
+            changes.pop("lfo_offset", None)
+        self.sendControlMessage(changes)
 
     def postStart(self):
         logger.debug("opening control socket...")
diff --git a/owrx/source/direct.py b/owrx/source/direct.py
index 904d2ea..cd36b55 100644
--- a/owrx/source/direct.py
+++ b/owrx/source/direct.py
@@ -7,12 +7,8 @@ logger = logging.getLogger(__name__)
 
 
 class DirectSource(SdrSource, metaclass=ABCMeta):
-    def onPropertyChange(self, name, value):
-        logger.debug(
-            "restarting sdr source due to property change: {0} changed to {1}".format(
-                name, value
-            )
-        )
+    def onPropertyChange(self, changes):
+        logger.debug("restarting sdr source due to property changes: {0}".format(changes))
         self.stop()
         self.sleepOnRestart()
         self.start()
diff --git a/owrx/source/fifi_sdr.py b/owrx/source/fifi_sdr.py
index 69babf4..badf3ac 100644
--- a/owrx/source/fifi_sdr.py
+++ b/owrx/source/fifi_sdr.py
@@ -30,7 +30,6 @@ class FifiSdrSource(DirectSource):
         values = self.getCommandValues()
         self.sendRockProgFrequency(values["tuner_freq"])
 
-    def onPropertyChange(self, name, value):
-        if name != "center_freq":
-            return
-        self.sendRockProgFrequency(value)
+    def onPropertyChange(self, changes):
+        if "center_freq" in changes:
+            self.sendRockProgFrequency(changes["center_freq"])
diff --git a/owrx/source/resampler.py b/owrx/source/resampler.py
index 1f6a4e1..a367894 100644
--- a/owrx/source/resampler.py
+++ b/owrx/source/resampler.py
@@ -6,8 +6,8 @@ logger = logging.getLogger(__name__)
 
 
 class Resampler(DirectSource):
-    def onPropertyChange(self, name, value):
-        logger.warning("Resampler is unable to handle property change ({0} changed to {1})".format(name, value))
+    def onPropertyChange(self, changes):
+        logger.warning("Resampler is unable to handle property changes: {0}".format(changes))
 
     def __init__(self, props, sdr):
         sdrProps = sdr.getProps()
diff --git a/owrx/source/soapy.py b/owrx/source/soapy.py
index e713ba0..0c03a67 100644
--- a/owrx/source/soapy.py
+++ b/owrx/source/soapy.py
@@ -80,9 +80,12 @@ class SoapyConnectorSource(ConnectorSource, metaclass=ABCMeta):
             values["soapy_settings"] = settings
         return values
 
-    def onPropertyChange(self, prop, value):
+    def onPropertyChange(self, changes):
         mappings = self.getSoapySettingsMappings()
-        if prop in mappings.keys():
-            value = "{0}={1}".format(mappings[prop], self.convertSoapySettingsValue(value))
-            prop = "settings"
-        super().onPropertyChange(prop, value)
+        settings = {}
+        for prop, value in changes.items():
+            if prop in mappings.keys():
+                settings[mappings[prop]] = self.convertSoapySettingsValue(value)
+        if settings:
+            changes["settings"] = ",".join("{0}={1}".format(k, v) for k, v in settings.items())
+        super().onPropertyChange(changes)
diff --git a/test/property/test_property_filter.py b/test/property/test_property_filter.py
index 66eff3b..db6dfd3 100644
--- a/test/property/test_property_filter.py
+++ b/test/property/test_property_filter.py
@@ -11,7 +11,7 @@ class PropertyFilterTest(TestCase):
         pf = PropertyFilter(pm, "testkey")
         self.assertEqual(pf["testkey"], "testvalue")
 
-    def testMissesPropert(self):
+    def testMissesProperty(self):
         pm = PropertyLayer()
         pm["testkey"] = "testvalue"
         pf = PropertyFilter(pm, "other_key")
@@ -25,7 +25,7 @@ class PropertyFilterTest(TestCase):
         mock = Mock()
         pf.wire(mock.method)
         pm["testkey"] = "testvalue"
-        mock.method.assert_called_once_with("testkey", "testvalue")
+        mock.method.assert_called_once_with({"testkey": "testvalue"})
 
     def testForwardsPropertyEvent(self):
         pm = PropertyLayer()
diff --git a/test/property/test_property_layer.py b/test/property/test_property_layer.py
index 472c14f..4b77e70 100644
--- a/test/property/test_property_layer.py
+++ b/test/property/test_property_layer.py
@@ -19,7 +19,7 @@ class PropertyLayerTest(TestCase):
         mock = Mock()
         pm.wire(mock.method)
         pm["testkey"] = "after"
-        mock.method.assert_called_once_with("testkey", "after")
+        mock.method.assert_called_once_with({"testkey": "after"})
 
     def testUnsubscribe(self):
         pm = PropertyLayer()
@@ -27,7 +27,7 @@ class PropertyLayerTest(TestCase):
         mock = Mock()
         sub = pm.wire(mock.method)
         pm["testkey"] = "between"
-        mock.method.assert_called_once_with("testkey", "between")
+        mock.method.assert_called_once_with({"testkey": "between"})
 
         mock.reset_mock()
         pm.unwire(sub)
diff --git a/test/property/test_property_stack.py b/test/property/test_property_stack.py
index 31e3b36..3711868 100644
--- a/test/property/test_property_stack.py
+++ b/test/property/test_property_stack.py
@@ -49,7 +49,7 @@ class PropertyStackTest(TestCase):
         mock = Mock()
         stack.wire(mock.method)
         layer["testkey"] = "testvalue"
-        mock.method.assert_called_once_with("testkey", "testvalue")
+        mock.method.assert_called_once_with({"testkey": "testvalue"})
 
     def testPropertyChangeEventPriority(self):
         low_layer = PropertyLayer()
@@ -64,7 +64,7 @@ class PropertyStackTest(TestCase):
         low_layer["testkey"] = "modified low value"
         mock.method.assert_not_called()
         high_layer["testkey"] = "modified high value"
-        mock.method.assert_called_once_with("testkey", "modified high value")
+        mock.method.assert_called_once_with({"testkey": "modified high value"})
 
     def testPropertyEventOnLayerAdd(self):
         low_layer = PropertyLayer()
@@ -162,7 +162,7 @@ class PropertyStackTest(TestCase):
         mock = Mock()
         stack.wire(mock.method)
         stack.removeLayer(layer)
-        mock.method.assert_called_once_with("testkey", None)
+        mock.method.assert_called_once_with({"testkey": None})
         mock.reset_mock()
 
         layer["testkey"] = "after"