M8SL2-00-002-812 T854 Initial Tuning and Adjustment C3.17
© Copyright Tait Electronics Limited August 2004. All rights reserved.
1. Remove the top and bottom cover from the T854 transmitter.
2. Remove the Aux D-range and replace with the supplied D-range socket.
3. Connect the T1500-52-0000 wires to the D-range PCB, audio processor and exciter
compartments as shown in the table above.
4. Fit cable clamps to all points where wires pass through the radio’s chassis.
5. Fit the wire clamp to the forward and reverse voltage input wires at the point
were they cross over between compartments.
6. Mount the T1500-52-0000 component side up on the chassis lugs provided in the
audio compartment, at the top (Carrier button) end.
Note: Take care not to knock the T1500-52-0000 PCB while the covers are off. A
sharp knock on the SMD electro capacitors will damage the board.
7. Fit a ribbon cable if multi-channel operation is required.
8. Run up the board according to the test section below.
9. Ensure that the cable clamps hold down all wires safely so that they will not be
pinched. Replace both covers.
3.10.1.2 T1500-52-0000 Testing/Alignment
Equipment required
• 50Ω power meter
• 3 or 6dB attenuator as needed.
Forward alarm
1. Connect the power meter to the transmitter output.
2. Key up the transmitter and set the output power to the desired low forward
power alarm threshold point.
3. Adjust the “Fwd-alarm adjust” preset until the forward alarm LED just comes
ON.
4. Reset the output power to the operational output level. Check the alarm output is
now OFF.
5. Turn the transmitter OFF.
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