Daniels VT-4R150 Instruction Manual
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Contents
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DEDANIELSELECTRONICS3-2 VT-4R150 VHF Project 25 Digital Transmitter Instruction Manual3.3 Major Frequency ChangeChanges greater than ± 1 MHz from a previously tuned transmit frequency will require RFAmplifier alignment as per the UHF Amplifier Instruction Manual. The Digital Transmitter SignalProcessor Board, once programmed for the new frequency, should not require any alignment, as itis capable of operation over the entire band from 406-470 MHz.3.4 Digital Signal Processor Board AlignmentIf the Digital Signal Processor or Transceiver RF Boards have been replaced, it is necessary toalign the Digital Signal Processor Board. This consists of adjusting the reference oscillatorfrequency, aligning the deviation balance at high and low modulation frequencies, and adjustingthe deviation limiting at a number of frequencies over the operational band of the Receiver.3.4.1 Radio Service SoftwareThe Radio Service Software is an application that runs under Microsoft Windows 3.1, 95, or 98,and is used to program the radio’s channel frequencies and other operational characteristics. It isused in conjunction with the Radio Programming Interface Module to read and write information tothe internal memory of the radio. For information about installing and using the Radio ServiceSoftware, see the Radio Service Software Manual, which is available as an Adobe Acrobat file(.PDF) on the CD-ROM, which contains the Radio Service Software.3.4.2 Radio Programming Interface Module InterconnectionThe Radio Programming Interface Module is used to make a connection between the computerrunning the Radio Service Software and the radio module. On the computer side, it connects to anRS-232 serial port via a standard nine pin serial cable. Another cable connects the RadioProgramming Interface Module to the radio to be programmed. Once the connections are made,the Radio Service Software may be run on the computer and the radio switched on. The RadioService Software must be configured to use the correct serial port on the computer. This is done inthe Preferences menu of the Main screen. When the radio is switched on, the Power LED on theRadio Programming Interface Module should light. To test the serial connection, open theReceiver Configuration screen by clicking on the Transmitter button in the Main screen. Click onthe Receiver menu, then on the ID… menu item. Click on the Read ID button. The Data LED onthe Radio Programming Interface Module should light briefly and the serial number, modelnumber, and last programmed date should appear in the appropriate fields.3.4.3 Reference Oscillator AdjustmentThe reference oscillator provides an accurate frequency standard to which the transmitter's carriersignal is phase locked. To adjust the reference oscillator frequency, disconnect the Transceiver RFBoard from the amplifier module by separating the SMB connectors. For this test, the TransceiverRF board will generate a 0 dBm RF signal from its RF output. Connect the RF output cable of theTransceiver RF board to a frequency counter or communications test set. Connect the transmitterto an IBM compatible computer using the Programming Cable. Apply power to the transmitter andrun the Radio Programming Software. Navigate to the TRANSMITTER \ SERVICE \REFERENCE OSCILLATOR menu, where you will see a test frequency displayed and a slider toadjust the frequency. Click on the "ENABLE TX" button and move the slider until the frequency |
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