diff --git a/armsrc/lfops.c b/armsrc/lfops.c
index 8cd9c68e9..1e6f22863 100644
--- a/armsrc/lfops.c
+++ b/armsrc/lfops.c
@@ -1529,7 +1529,7 @@ void T55xxReadBlock(uint16_t arg0, uint8_t Block, uint32_t Pwd) {
     // Turn field on to read the response
     // 137*8 seems to get to the start of data pretty well...
     // but we want to go past the start and let the repeating data settle in...
-    TurnReadLFOn(200 * 8);
+    TurnReadLFOn(150 * 8);
 
     // Acquisition
     // Now do the acquisition