diff --git a/docs/c-netz.html b/docs/c-netz.html
index 5a77acc..a6ff170 100644
--- a/docs/c-netz.html
+++ b/docs/c-netz.html
@@ -54,7 +54,7 @@ A caller must not know the location of the phone anymore to reach the right base
 	<li>Channel spacing: 10 KHz and optionally 12.5 KHz
 	<li>Voice modulation: FM
 	<li>Signaling modulation: carrier FSK
-	<li>Frequency deviation: 2.5 KHz (FSK); 4 KHz (Voice)
+	<li>Frequency deviation: 2.5 KHz (FSK); 2.4 or 4 KHz (Voice)
 	<li>Mobile station transmit power: 50 mW up to 15 Watts
 	<li>Base station transmit power: 25 Watts
 	<li>Features: Speech Compandor, Audio scrambling
diff --git a/src/cnetz/main.c b/src/cnetz/main.c
index cd8fbe2..27c2a02 100644
--- a/src/cnetz/main.c
+++ b/src/cnetz/main.c
@@ -77,7 +77,7 @@ int meldeinterval = 120; /* when to ask the phone about beeing alive */
 int meldeaufrufe = 3; /* how many times to ask phone about beeing alive */
 enum demod_type demod = FSK_DEMOD_AUTO;
 int metering = 20;
-double speech_deviation = 4000.0; /* best results with all my equipment */
+double speech_deviation = 2400.0; /* best results with older equipment (not C5) */
 
 void print_help(const char *arg0)
 {
@@ -125,8 +125,8 @@ void print_help(const char *arg0)
 	printf("        Increment  metering counter every given number of seconds.\n");
 	printf("        To turn off, use 0. (default = %d)\n", metering);
 	printf(" -V --voice-deviation <2400..4000 Hz>\n");
-	printf("        It is unclear what the actual voice deviation is. Please decrease, if\n");
-	printf("        mobile's microphone is too loud and speaker is too quiet.\n");
+	printf("        It is unclear what the actual voice deviation is. Please increase, if\n");
+	printf("        mobile's earpiece is too quiet and the microphone is too loud.\n");
 	printf("        (default = %.0f)\n", speech_deviation);
 	printf(" -S --sysinfo timeslots=1|2|4|8\n");
 	printf("        Set number of timeslots of OgK broadcast. There are 32 time slots per\n");