User's Guide

1-2 Enhanced AM/FM Synthesizer Instruction Manual OS(R/T)-3(A/H) 29 - 470 MHz
Frequency Band: 118 - 159.4 MHz, AM Multichannel OS-3H1xx Analog Board
• OST-3A128 - installed in AM transmitter, 118 - 138 MHz RF output.
• OSR-3A149 - installed in AM receiver, 139.4 - 159.4 MHz RF output.
Frequency Band: 128 - 174 MHz, Common OS-3H1xx Analog Board
• OST-3H141 - installed in FM transmitter, 128 - 152.6 MHz RF output.
• OST-3H162 - installed in FM transmitter, 150 - 174 MHz RF output.
• OSR-3H141 - installed in FM receiver, 128 - 152.6 MHz RF output.
• OSR-3H162 - installed in FM receiver, 150 - 174 MHz RF output.
Frequency Band: 406 - 470 MHz, Common OS-3H4xx Analog Board
• OST-3H418 - installed in FM transmitter, 406 - 430 MHz RF output.
• OST-3H460 - installed in FM t ransmitter, 450 - 470 MHz RF output
• OSR-3H440 - installed in FM receiver, 427.4 - 451.4 MHz RF output.
All OS-3A/H Enhanced Synthesizer Modules, regardless of the frequency band, use the same
digital PCB and mechanical construction . There are, however , significant differences between the
various models when it comes to the analog PCB. There are four different analog PCBs, designed
to cover the four frequency bands of 29 - 50 MHz, 118 - 159.4 MHz, 128 - 174 MHz and
406 - 470 MHz. Each model’s specific sub-band of operation within a given frequency band is
determined through SELECT components on the corresponding analog board.