Instruction Manual

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ELECTRONICS
2-8 Enhanced AM/FM Synthesizer Instruction Manual OS(R/T)-3(A/H) 29 - 470 MHz
2.6 5.0/6.25 kHz Channelization.
The operating frequency is determined as follows for Synthesizers having 5.0/6.25 kHz channel
increment capability;
• for BCD switch settings (in the range of 0000 to 4999 , multiply the switch
setting by 5.0 kHz and add it to the synthesizer base frequency.
Example: An OST-3H141 synthesizer has a base frequency of 128 MHz. The
selected channel number is 0988. The synthesizer output frequency is:
((988 x 5 kHz) + 128 MHz) = 132.940 MHz
• for BCD switch settings in the range of 5000 to 9999 , subtract 5000 from the
switch setting, multiplying the result by 6.25 kHz and add it to the synthesizer
base frequency.
Example: An OSR-3H162 synthesizer has a base frequency of 150 MHz. The
selected channel number is 7205. The synthesizer output frequency is:
((7205-5000) x 6.25 kHz) + 150 MHz) = 163.78125 MHz
The key point to remember is that 5.0 kHz channel increments are selected with BCD
channel switch settings in the range of #0000 through #4999 and 6.25 kHz channel
increments are selected with BCD switch settings in the range of #5000 through #9999.
2.7 8.333 kHz Channelization.
The operating frequency is determined as follows for Synthesizers having 8.333 kHz channel
increment capability;
• Multiply the BCD switch setting by 8.333 kHz and add it to the synthesizer
base frequency.
Example: An OST-3A128 synthesizer has a base frequency of 118 MHz. The
selected channel number is 0231. The synthesizer output frequency is:
[(1200 x 8.333 kHz) + 118 MHz] = 128.000 MHz