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Old Pages/Amateur/HAM_HT_Baofeng_UV-3R_Mic-Volume.md

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+## Types
+
+There are several things that can cause built in mic sensitivity to be
+inadequate.
+
+- some batches have mic gain that is too high caused by poorly adjusted
+  trim pots
+- some have it too low due to the same reason
+- some have something wrong in the MCU that keeps the gain too low
+- some have misaligned case isolation bushing that cover the pin prick
+  mic hole in the case
+
+## Bushing/Case Fix
+
+1.  invoke your inner caveman
+2.  remove the front panel of the case
+3.  widen the mic hole in the front panel to ~2mm or 3mm (a pocket knife
+    does fine)
+4.  reassemble and test. if it works well stop here else keep going
+5.  remove the front case panel and remove the rubber boot over the
+    electrilet mic.
+6.  use a knife or a hole punch to widen the hole without removing the
+    entire flat face (which is there to help reduce vibrations in the
+    case from getting to the mic).
+7.  reassemble and test if it didn't work it is probably something else
+    or a combination of this and something else.