User Manual

MT-4E VHF & UHF Receiver & Transmitter Instruction Manual

IM08-MT-4E-TXRX Project 1106

Hardware Tuning and Troubleshooting

TRANSMITTER TROUBLESHOOTING

The Transmitter is composed of 4 main components, the Transmitter Main Board, the Synthesizer

Module, RF Power Amplier and Universal Daughter Board (UDB). An optional Encryption Board can

also be installed in the Transmitter.

These steps will help you determine the most likely sub-assembly that contains a fault, and may

help you determine what that fault is. The sub-assembly or the entire transmitter can be sent back to

Daniels Service section for repair. Contact Daniels Service section before returning any product.

Before testing, the transmitter should be in the subrack, or connected to the subrack by means of

an Extender card or kit, and the main power to the system (+13.8 VDC) and the +9.5 VDC regulated

supply should be checked via the front panel of the System Regulator. The transmitter RF output

should be terminated with a 50 Ω load, or communications test set.

Complete Transmitter

Flip the transmitter front panel NORMAL/OFF/ KEY TX switch from the OFF position to the NORMAL

position and check that the two front panel LEDs both turn ON for less than 2 seconds and then turn

OFF. If this is not the case, or the transmitter is not functioning properly, the following steps can be

taken:

Connect the Transmitter to the PC with the USB cable and run the Radio Service Software (RSS).

Select (P25 or Analog) Transmitter click on Congure, then click on Read to read the Transmitter

conguration. If the RSS returns “Device Not Responding”, physically inspect the USB cable and

connection, check the Daniels USB driver, and check the connection through the Device Manager. If

the RSS still does not recognize the connection, the most likely fault is on the UDB.

Click on Tx ID, then click on Read to read the Transmitter ID. Conrm that the Frequency Band in the

Synthesizer ID Model Number matches the Frequency Band in the Transmitter Global Settings. If the

settings do not match, the synthesizer will require replacement, or the programming will need to be

changed to match the synthesizer hardware.

If the transmitter still is not functioning properly the module level check should be conducted in the

following order: