Daniels VT-3/140-SWA2 Instruction Manual
                                                                                                                                                                                                                                                                      | |
Contents
| 
VHF Enhanced Transmitter Instruction Manual VT-3 132 - 174 MHz 2-12 SYSTEM OVERVIEW2.1 Transmitter OperationSeveral modules are integrated by the VT-3 Transmitter Main board to provide the completetransmitter. The Transmitter Main Board, Front Panel Board and Audio Processor are generic inthat they apply to all transmitter models. The Front Panel Board and Audio Processor are soldereddirectly to the Transmitter Main Board and are treated collectively in the Transmitter Main BoardManual. The operating frequency and power range is determined by the choice of Amplifier andFrequency Synthesizer Module, which plugs in to the Transmitter Main Board and can be changedwith minimal effort. Circuitry and jumpers on the Transmitter Main Board control the operation ofall modules and the operation of the transmitter, overall. Technical details and a completedescription of transmitter operation can be found in the Transmitter Main Board Manual.The VT-3 132 - 174 MHz transmitter requires two power supplies; a regulated +9.5 Vdc supplyand a +13.8 Vdc supply, the latter of which is connected only to the Amplifier Module. The(nominally) +13.8 Vdc supply's range is +11 Vdc to +16 Vdc. For the 0.5 to 2.0 Watttransmitters, there is no current drawn on the 13.8 Vdc supply. For the 2.0 to 8.0 Watt transmitters,the current drawn from the +13.8 Vdc supply (while transmitting at the rated power) isapproximately 1000 mA with temperature, operating frequency and power supply voltage. Thecurrent drawn by the 13.8 Vdc line should not exceed 1500 mA. The +9.5 Vdc current drawn byall transmitter models while transmitting at the rated power is approximately 1300 mA and shouldnot exceed 1500 mA. The VT-3 Transmitter has four different standby modes that trade-offstandby current consumption for start-up speed. The standby modes are determined by threejumpers (refer to the MT-3 Transmitter Main Board Manual): jumper J6 which always turns on the'+9.5 Vdc Switched' supply, jumper J7 which selects the power source for the MT-3 AudioProcessor and jumper J18 which selects the enable line for the OS-3H150 Synthesizer Module.• MODE 1: Jumper J6 out- the audio processor is switched by a PTT signal- the synthesizer module is switched by a PTT signal- standby current: Typically 7 mA- start-up time: Typically 50 ms |
Related manuals for Daniels VT-3/140-SNA2
This manual is suitable for:
manualsdatabase
Your AI-powered manual search engine