Daniels Electronics Ltd. OST-3H035 Instruction Manual
Also see for MT-3: Instruction manualInstruction manualInstruction manual
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Contents
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DE DANIELSELECTRONICS3-6 Enhanced AM/FM Synthesizer Instruction Manual OS(R/T)-3(A/H) 29 - 470 MHz3 . 5 . 5 . 4 UHF OS(R/T)-3H 406 - 470 MHz VCO AlignmentRefer to the "OS(R/T)-3H 406 - 470 MHz Analog Board Component Layout" diagrams and the"OS(R/T)-3H 406 - 470 MHz Analog Board Schematic Diagram" located in section 4 on pages 13,14 and 15.Using a high impedance (10 MΩ) DC Voltmeter, measure the PLL control voltage at TP4 locatedon the synthesizer module analog board (top). Access to TP4 is available through the synthesizertop cover. The UHF synthesizers operating in the 406 - 470 MHz frequency range employintegrated VCO modules having no frequency adjustment capability. The OST-3H440 and OSR-3H440 models cover 406-470 MHz, and 427.4 - 470 MHz respectively and provide full bandcoverage without tuning adjustment. Measured PLL loop control voltages below approximately+0.5 Vdc and above approximately +7.0 Vdc indicates an "out of lock" synthesizer condition.It is important to check the loop control voltage at TP4 when multiple synthesizer channels havebeen programmed. All channel selections should result in a TP4 voltage within the +1.0 to +7.0Vdc range. Channel selections beyond the tuning range capability of the synthesizer will result inunlocked operation. The tuning range capability of all synthesizer models is listed in theSpecifications section of this manual.3 . 5 . 5 . 5 Reference Frequency AlignmentAdjust the synthesizer TCXO fine frequency potentiometer RV1 until the correct output frequencyis achieved. Access to this potentiometer is made available through an opening in the synthesizertop cover. An RF power level of approximately +5 dBm should be measured at the synthesizermodule output connector and the frequency should be within ±1 ppm from the desired operatingfrequency. Reference frequency adjustments should be made at room temperature (+20°C) after tenminutes.3.5.6 Jumper ConfigurationSolder jumpers are clearly marked on both the synthesizer digital and analog circuit boards. Referthe "OS(R/T)-3(A/H) Digital Board Component Layout (Bottom)" diagram in section 4 page 14,and the applicable "OS(R/T)-3(A/H) Analog Board Component Layout (Top)" diagram for jumperlocations. The following list details the required jumper configuration for the two synthesizeroperating modes:1) Internal reference. Install jumper JU1-B, on Analog Board (Standard). The internaltemperature compensated crystal oscillator (TCXO) provides the reference signalwith a stability less than ±1 ppm from -30°C (Optional -40°C) to + 60°C. (Locatedon the Analog Board) |
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