Daniels Electronics Ltd. OST-3H035 Instruction Manual
Also see for MT-3: Instruction manualInstruction manualInstruction manual
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DE DANIELSELECTRONICSEnhanced AM/FM Synthesizer Instruction Manual OS(R/T)-3(A/H) 29 - 470 MHz 2-5division ratio, established by the resistive dividers R21 and R22, allows low deviation (less than 5kHz) direct frequency modulation of the VCO output signal.The PLL lowpass filter is formed from select component values C37, C38, C39, C45, R32, andR36. The loop filter response is optimized for switching time, noise, and modulation requirementsspecific to each sub-band within the 128 - 174 MHz frequency range. The select componentvalues (including the loop filter) can be found in tabular format as part of the VHF OS(R/T)-3(A/H) 128 - 174 MHz Analog Board Schematic diagram.RF output power is taken from the source of Q5 and amplified/buffered by U11. U15 providesfurther amplification and isolation while delivering ≈ +10 dBm to a five pole lowpass output filterformed from C53, C58, C59, L11, and L12. The five pole lowpass output filter providesa 190 MHz low pass cutoff frequency which reduces harmonic output to acceptable levels. SMBconnector J2 provides interconnection to the companion transmitter or receiver with an output levelof ≈ +5 dBm.2.2.5 406 - 470 MHz Analog Board CircuitryRefer to the "OS(R/T)-3H 406 - 470 MHz Analog Board Schematic Diagram" located in section 4page 15 of this manual.The UHF OS(R/T)-3H 406 - 470 MHz synthesizer employs integrated surface mount VCOmodules (designated U17) for full frequency band coverage. Two VCO modules are used to cover406 - 470 MHz (TX) and 427.4 - 451.4 MHz (RX) for transmitter and receiver UHF applicationsrespectively. The receiver VCO module is optimized for low phase noise, while the transmitterVCO is configured with modulation input capability. PLL voltage feedback control from the outputof the lowpass loop filter controls the VCO frequency through Mod I/P (pin 2). The PLL controlvoltage can range from ≈ +1.0 Vdc to +7.0 Vdc depending on the selected operating frequency.External baseband frequency modulation is provided through connection P1 and VCO Mod inputpin 6.The PLL lowpass filter is formed from select component values C37, C38, C39, C45, R32, andR36. The loop filter response is optimized for switching time, noise, and modulation requirementsspecific to each sub-band within the 406 - 470 MHz frequency range. The select component values(including the loop filter and VCO type) can be found in tabular format as part of the UHFOS(R/T)-3H 406 - 470 MHz Analog Board Schematic diagram.RF output power is taken from the VCO RF output and amplified/buffered by U11. U15 providesfurther amplification and isolation while delivering ≈ +10 dBm to a five pole lowpass output filterformed from C53, C58, C59, L11, and L12. The five pole lowpass output filter providesa 530 MHz low pass cutoff frequency which reduces harmonic output to acceptable levels. SMBconnector J2 provides interconnection to the companion transmitter or receiver with an output levelof ≈ +5 dBm. |
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