Instruction Manual
DE
DANIELS
ELECTRONICS
Enhanced AM/FM Synthesizer Instruction Manual OS(R/T)-3(A/H) 29 - 470 MHz 2-7
subtracted from the synthesizer operating frequency in order to determine the actual receive
frequency. Refer to the channel designation table documentation provided with the transmitter or
receiver modules for simplified channel number and frequency information.
2.4.2 Frequency Select Handle Frequency Control
For operation in this mode the external channel select must be set to channel #16. Channel
selection is achieved by pushing the buttons Frequency Increase Ø and Frequency Decrease Œ on
the Frequency Select Handle. The Frequency Select Handle is located on the Front Panel. The user
interface consists of an 8 digit display and 3 pushbuttons. On power up or key press, the
synthesizer is interrogated for the current channel number and channel frequencies. This
information is used to generate the display, and update the synthesizer itself. The module
communicates with the synthesizer using a standard 2 wire serial interface (9600 Baud, 8 bits, no
parity, 1 stop bit). The command protocols are simple ASCII, both to and from the synthesizer.
The frequency value and the channel are displayed on the Front Panel for several seconds only, in
order to conserve power. Another dedicated line allows the handle to temporarily wake up the
synthesizer if it has been powered down. (This is currently only used on the transmitters)
For the detailed information about changing frequency see the "Frequency Select Handle
Instruction Manual".
2.5 Synthesizer Base and Frequency Increment Table
The OS-3A/H Synthesizer operates in frequency increments of 5.0 / 6.25 kHz, 12.5 kHz, or 25
kHz depending on the particular model and band of operation. The Base Frequency is the lowest
frequency of any given synthesizer model.
Model
Number
Freq.
Range
Base
Frequency
Freq.
Increment
OST-3H035 29 - 38 MHz 29 MHz 5.0/6.25 kHz
OST-3H045 38 - 50 MHz 29 MHz 5.0/6.25 kHz
OSR-3H061 50.4 - 71.4 MHz 50.4 MHz 5.0/6.25 kHz
OST-3A128 118 - 138 MHz 118 MHz 25/8.333 kHz
OST-3H141 128 – 152.6 MHz 128 MHz 5.0/6.25 kHz
OST-3H162 150 - 174 MHz 150 MHz 5.0/6.25 kHz
OSR-3H141 128 - 153 MHz 128 MHz 5.0/6.25 kHz
OSR-3A149 139.4 - 159.4 MHz 139.4 MHz 25/8.333 kHz
OSR-3H162 150 - 174 MHz 150 MHz 5.0/6.25 kHz
OST-3H440 406 - 470 MHz 406 MHz 12.5 kHz
OSR-3H440 427.4 - 451.4 MHz 427.4 MHz 12.5 kHz