changed tlm[3][A] to go negative

afsk/main.c

@@ -897,7 +897,8 @@ void get_tlm(void) {
     tlm[2][C] = (int)(99.5 - current[map[MINUS_Z]] / 10.0) % 100; // -Z current (was timestamp)
     tlm[2][D] = (int)(50.5 + current[map[BAT]] / 10.0) % 100; // NiMH Battery current
 
-    tlm[3][A] = abs((int)((voltage[map[BAT]] * 10.0) - 65.5) % 100);
+//    tlm[3][A] = abs((int)((voltage[map[BAT]] * 10.0) - 65.5) % 100);
+    tlm[3][A] = (int)((voltage[map[BAT]] * 10.0) - 65.5) % 100;  // allow it to go negative for voltages less than 6.5 V
     tlm[3][B] = (int)(voltage[map[BUS]] * 10.0) % 100; // 5V supply to Pi
 
     tlm[4][B] = (int)((95.8 - cpuTemp) / 1.48 + 0.5) % 100;