Antenna Tuning Unit
ATU(Antenna Tuning Unit), is Impedance Matching device installed at Outside(near the Antenna) so that transmitter output can radiates better through the antenna.
This ATU can be manual or automatically tuned. When the ATU is at Automatic-mode, Auto Tune Motor with Circuit module drives Variable Inductor to make the best Impedance matching status. Also if Impedance matching value exceeds limit during operation due to unexpected reasons such as weather change, then Auto Tune Motor with Circuit module notices it and drives Variable Inductor again so that the best Impedance matching status can be realized.
Meter is placed inside of the ATU to check Antenna current and Reflect power, and also ARC GAP and DRAIN COIL are installed to protect the transmitter from lightning.
|1. INPUT IMPEDANCE||50ohm|
|2. LOAD IMPEDANCE||2 to 30ohm resistance with capacitance (about 200-1500PF)|
|3. OPERATION FREQUENCY||190KHz to 550KHz|
|4. POWER INPUT||Up to 2KW watts continuity power|
|5. TUNING TIME||Tap changed to large coil(Coarse tuning) with Vernier tuning by motor drive for Automatic tuning|
|6. POWER REQUIREMENT||+24V.dc|
|7. OPERATIONING TEMPERATURE RANGE||-40℃ to +50℃|
|8. OPERATIONING HUMIDITY||100% at relative Humidity|
|9. MEASUREMENT CAPABILITY||Antenna Current, Reflected Power|