diff --git a/README.md b/README.md
index 24efe28..51b8fb5 100644
--- a/README.md
+++ b/README.md
@@ -10,8 +10,15 @@ You will need these dependencies:
  - [libcURL](http://curl.haxx.se/)
 
 Both build from source fairly easily, but the easiest way to acquire them for
-Ubuntu lucid is:
+Ubuntu is:
 
  - [JsonCpp (PPA)](https://launchpad.net/~danieljonathanrichman/+archive/ppa)
- - [libcURL (apt)](http://packages.ubuntu.com/lucid/libcurl4-openssl-dev)
+   for Ubuntu oneiric (11.10) and older
+ - [libjsoncpp-dev (apt)](http://packages.ubuntu.com/precise/libjsoncpp-dev)
+ - [libcurl4-openssl-dev (apt)](http://packages.ubuntu.com/precise/libcurl4-openssl-dev)
+
+Or Debian:
+
+ - libjsoncpp-dev in wheezy and newer (the wheezy package also works fine on squeeze)
+ - libcurl4-openssl-dev
 
diff --git a/src/UKHASExtractor.cxx b/src/UKHASExtractor.cxx
index fe77b31..e5da8e5 100644
--- a/src/UKHASExtractor.cxx
+++ b/src/UKHASExtractor.cxx
@@ -22,11 +22,19 @@ void UKHASExtractor::reset_buffer()
 
 void UKHASExtractor::skipped(int n)
 {
-    if (n > 20)
-        n = 20;
+    if (extracting)
+    {
+        skipped_count += n;
 
-    for (int i = 0; i < n; i++)
-        push('\0', PUSH_NONE);
+        /* If radio goes silent for too long (~10s at 50baud,
+         * ~1.5s at 300baud) */
+        if (skipped_count > 50)
+        {
+            mgr->status("UKHAS Extractor: giving up (silence)");
+            reset_buffer();
+            extracting = false;
+        }
+    }
 }
 
 void UKHASExtractor::push(char b, enum push_flags flags)
@@ -41,6 +49,7 @@ void UKHASExtractor::push(char b, enum push_flags flags)
         buffer.push_back(b);
 
         garbage_count = 0;
+        skipped_count = 0;
         extracting = true;
 
         mgr->status("UKHAS Extractor: found start delimiter");
@@ -82,7 +91,7 @@ void UKHASExtractor::push(char b, enum push_flags flags)
             garbage_count++;
 
         /* Sane limits to avoid uploading tonnes of garbage */
-        if (buffer.length() > 1000 || garbage_count > 16)
+        if (buffer.length() > 1000 || garbage_count > 32)
         {
             mgr->status("UKHAS Extractor: giving up");
 
diff --git a/src/UKHASExtractor.h b/src/UKHASExtractor.h
index 3948f15..a21ead6 100644
--- a/src/UKHASExtractor.h
+++ b/src/UKHASExtractor.h
@@ -12,6 +12,7 @@ class UKHASExtractor : public Extractor
     int extracting;
     char last;
     string buffer;
+    int skipped_count;
     int garbage_count;
 
     void reset_buffer();
diff --git a/tests/test_extractor.py b/tests/test_extractor.py
index fcf4273..531f0ad 100644
--- a/tests/test_extractor.py
+++ b/tests/test_extractor.py
@@ -178,21 +178,21 @@ class TestUKHASExtractor:
 
         self.test_extracts()
 
-    def test_gives_up_after_16skipped(self):
+    def test_gives_up_after_50_skipped(self):
         self.extr.push("$$")
         self.extr.check_status("start delim")
-        self.extr.skipped(10000)
+        self.extr.skipped(51)
         self.extr.check_status("giving up")
         self.extr.check_quiet()
         self.extr.push("\n")
         self.extr.check_quiet()
 
-    def test_gives_up_after_16garbage(self):
+    def test_gives_up_after_32_garbage(self):
         self.extr.push("$$")
         self.extr.check_status("start delim")
 
         self.extr.push("some,legit,data")
-        self.extr.push("\t some printable data" * 17)
+        self.extr.push("\t some printable data" * 33)
         self.extr.check_status("giving up")
         self.extr.check_quiet()
 
@@ -207,9 +207,7 @@ class TestUKHASExtractor:
         self.extr.check_status("start delim")
         self.extr.skipped(5)
         self.extr.push("data\n")
-        # JsonCPP doesn't support \0 in strings, so the mock UploaderThread
-        # replaces it with \1s
-        self.extr.check_upload("$$some\1\1\1\1\1data\n")
+        self.extr.check_upload("$$somedata\n")
         self.extr.check_status("extracted")
         self.extr.check_status("parse failed")
         self.extr.check_data()
diff --git a/tests/test_extractor_mocks.h b/tests/test_extractor_mocks.h
index ca7e268..34463f1 100644
--- a/tests/test_extractor_mocks.h
+++ b/tests/test_extractor_mocks.h
@@ -42,13 +42,6 @@ public:
 
 namespace habitat {
 
-static void inplace_nonulls(char &c)
-{
-    /* JsonCPP doesn't support '\0' in strings :'-( */
-    if (c == '\0')
-        c = '\1';
-}
-
 class UploaderThread
 {
 public:
@@ -56,12 +49,9 @@ public:
                            const Json::Value &metadata=Json::Value::null,
                            int time_created=-1)
     {
-        std::string data_copy(data);
-        std::for_each(data_copy.begin(), data_copy.end(), inplace_nonulls);
-
         Json::Value root(Json::arrayValue);
         root.append("upload");
-        root.append(data_copy);
+        root.append(data);
         root.append(metadata);
         root.append(time_created);