Codan Radio Communications VT-3-150-SN User Manual
3-6
VHF Amplifier Instruction Manual VT-3 132 - 174 MHz
3.6.2.5
Antenna VSWR Overload
1.
Disconnect the radio communications test set and so that the amplifier is terminated
with an open circuit.
with an open circuit.
2.
Monitor the current from the +9.5 Vdc supply.
3.
Adjust R37, the VSWR overload adjustment, clockwise until a noticeable drop in the
+9.5 Vdc current occurs.
+9.5 Vdc current occurs.
4.
Reconnect the radio communications test set and, the +9.5 Vdc current should return
to the previous level.
to the previous level.
3.6.2.6
Procedure Verification
1.
Verify that the current drawn from the +13.8 Vdc supply is less than 1.5 A and from
the +9.5 Vdc supply is less than 1.2 A when transmitting full RF output power (8
Watts).
the +9.5 Vdc supply is less than 1.2 A when transmitting full RF output power (8
Watts).
2.
Turn off the power to the transmitter.