diff --git a/net_io.c b/net_io.c
index ab127f2..35e1e27 100644
--- a/net_io.c
+++ b/net_io.c
@@ -1944,7 +1944,7 @@ static void writeFATSV()
             p += snprintf(p, bufsize(p, end), "\taddrtype\t%s", addrtype_short_string(a->addrtype));
         }
 
-        if (trackDataValidEx(&a->callsign_valid, now, 15000, SOURCE_MODE_S_CHECKED) && strcmp(a->callsign, "        ") != 0 && a->callsign_valid.updated > a->fatsv_last_emitted) {
+        if (trackDataValidEx(&a->callsign_valid, now, 35000, SOURCE_MODE_S_CHECKED) && strcmp(a->callsign, "        ") != 0 && a->callsign_valid.updated > a->fatsv_last_emitted) {
             p += snprintf(p, bufsize(p,end), "\tident\t%s", a->callsign);
             switch (a->callsign_valid.source) {
             case SOURCE_MODE_S:
@@ -1965,7 +1965,7 @@ static void writeFATSV()
             tisb |= (a->callsign_valid.source == SOURCE_TISB) ? TISB_IDENT : 0;
         }
 
-        if (trackDataValidEx(&a->squawk_valid, now, 15000, SOURCE_MODE_S) && a->squawk_valid.updated > a->fatsv_last_emitted) {
+        if (trackDataValidEx(&a->squawk_valid, now, 35000, SOURCE_MODE_S) && a->squawk_valid.updated > a->fatsv_last_emitted) {
             p += snprintf(p, bufsize(p,end), "\tsquawk\t%04x", a->squawk);
             useful = 1;
             tisb |= (a->squawk_valid.source == SOURCE_TISB) ? TISB_SQUAWK : 0;