User's Guide

1-2 Enhanced AM/FM Synthesizer Instruction Manual OS(R/T)-3(A/H) 29 - 935 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 transmitter, 450 - 470 MHz RF output
• OSR-3H440 - installed in FM receiver, 427.4 - 451.4 MHz RF output.
Frequency Band: 928 - 935 MHz, Common OS-3H932 Analog Board
• OST-3H932 - installed in FM transmitter, 928 - 935 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 five different analog PCBs,
designed to cover the five frequency bands of 29 - 50 MHz, 118 - 159.4 MHz, 128 - 174 MHz,
406 - 470 MHz and 928 - 935 MHz
. Each model’s specific sub-band of operation within a given
frequency band is determined through SELECT components on the corresponding analog board.