Detailed Answer
Range fixes: 1. new battery (low power reduces output); 2. check antenna (replace if loose/damaged; keep the transmitter antenna vertical); 3. receiver antenna position (move out of the metal cabinet, raise it, clear obstructions); 4. optional high-gain antenna (+30~50% range); 5. optional repeater (large-area scenarios); 6. avoid interference sources (VFDs/walkie-talkies). LDER is rated 200 m; 100-150 m in workshops is normal; add a repeater in storage yards.
| Battery | Replace |
| Antenna | External high-gain |
| Scenario | Repeater |
Note:Measure range under real working conditions at acceptance, leaving margin.