MT-4E VHF & UHF Receiver & Transmitter Instruction Manual
IM08-MT-4E-TXRX-P1162
VHF & UHF Hardware Tuning and Troubleshooting
18
tRanSMIttER tRouBlESHootInG
The transmitter is composed of four main components: the transmitter mainboard, the synthesizer
module, RF power amplifier and universal daughter board (UDB). An optional encryption module can
also be installed in the transmitter.
The following steps will help you determine the most likely sub-assembly that contains a fault and
may help you determine why the fault is occurring.
NOTE
: 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 of appropriate wattage or communications test set.
testing the transmitter
1. Flip the transmitter front panel NORM/ OFF/ KEY TX switch from the OFF position to the NORM position
2. Check that the two front panel LEDs both turn ON for less than two seconds and then turn OFF.
If this is not the case or the transmitter is not functioning properly, the following steps can be taken.
3. Connect the transmitter to the PC with the USB cable
4. Run the Radio Service Software (RSS).
5. Select [P25 or Analog] Transmitter.
6. Click
Configure
.
5. Click
Read
to read the transmitter configuration.
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.
6. Click
Tx ID
.
7. Click
Read
to read the transmitter ID.
Confirm 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 is still not functioning properly, the module level check should be conducted in the
following order.