1. When transmitting with an antenna, you should choose an antenna with a corresponding frequency standing wave ratio of less than 2. 2. Be sure to connect a load to the output end before supplying DC power. If it works without load, the module may be . 3. The power amplifier module is a bare module. It is not delivered with a cooling system. need to do the cooling themselves. The cooling system should not dissipate less than 20w.<br><br>Technical indicators: 1. Operating frequency: 1200MHz-1700MHz 2. Input and output impedance: 50Ω 3. Maximum input power: 3dBm@2mW 4. Output power: 10W@DC24V, 12W@28V. For specific parameters, please refer to the measurement chart below 5. Supply voltage: 24V-28V@24V is recommended 6. Working current: 1.5A-2A varies with frequency and supply voltage 7. Module connector: Both ends are SMA female (external thread inner hole) Note: Installation guide not included, we strongly recommend you professional installation. Please check as much as possible to make sure the item is what you need. Tips:The product may be updated constantly,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Color:Silver Material:Metal<br><br>Package Contents: 1 * module<br><br>Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.