diff --git a/src/wspr.c b/src/wspr.c
--- a/src/wspr.c
+++ b/src/wspr.c
@@ -105,7 +105,7 @@ void wspr_transmit(uint8_t* grid_locator
 
 
         // Static set ID
-        call[2] = '4'; // balloon ID #4
+        call[2] = '3'; // balloon ID #4
 
         // Subtract off previous portion
         subalt -= (chunk * 26 * 26 * 26);
@@ -198,7 +198,7 @@ void wspr_transmit(uint8_t* grid_locator
         chunk = engdata / 19;  
 
         // Encode
-        loc[3] = chunk;
+        loc[3] = '0' + chunk;
 
         // Subtract
         engdata -= (chunk * 19);