C3.10 T854 Initial Tuning and Adjustment M8SL2-00-002-812
© Copyright Tait Electronics Limited August 2004. All rights reserved.
3.7 PA Alignment
1. Check that the exciter is connected to the PA with the coaxial link.
2. Connect an RF power meter to the PA output (use an appropriate attenuator as
necessary).
3. Turn RV310 (power control) fully clockwise.
4. Key the transmitter by earthing the Tx-Key line.
5. Tune #CV475 until maximum power is obtained. Check that the power exceeds
30W.
6. Adjust RV310 (power control) to 25W.
7. Readjust #CV475 to reduce the supply current by up to 0.5A.
3.8 Thermal Shutdown
1. Key the transmitter by earthing the Tx-Key line and set the output power to 25W
as described in Section 3.7.
2. Short L481 to ground.
3. Set RV330 (shutdown power level) for an output power of 5W.
To Next Page
Loading...
Need help?
General
