User Manual

DE
DANIELS
ELECTRONICS
3-6 UHF Amplifier Instruction Manual UT-3 406 - 512 MHz
4 Adjust R36, the VSWR alarm adjustment, so that the voltmeter indicates +5 Vdc for a
3:1 mismatch.
5 Put the 50 ohm load back on again. The voltmeter should read approximately 0 Vdc.
6 Disconnect the voltmeter.
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 R38, 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 8 W RF output power.
2 Turn off the power to the transmitter.