Daniels VT-3/140-SWA2, Instruction Manual

Page: 146 / 262

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.
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.
4. Reconnect the radio communications test set and, the +9.5 Vdc current should return
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).
2. Turn off the power to the transmitter.