TSAT 3000 - Telemetry and data transfer via SATellite
TSAT 3000 Configuration Parameter Description, January 2013 Page 49 of 124
3.5.4 DAC_{TCXO | OCXO}_REF
Default 0, Range 0…17391
Change these MIBs to modify the default TCXO and/or OCXO Oscillator settings defined in
“hw.conf”, or just read-back CURRENT value.
Ver <= 30.1.1
Not Implemented
Ver >= 30.2.0:
Value Description
0 Do nothing – Keep settings from “hw.conf”.
1 … 17391 Initialize Oscillator ref voltage to a value between MIN and MAX.
Note 1: HUB Main-Unit is equipped with OCXO, while RT Main-Unit has a TCXO. You can
always read and change both MIBs (i.e. DAC setting), but change will only have effect
when Main-Unit is equipped with selected Oscillator.
Note 2: Normally, fabric calibration values defined in “hw.conf” should always be used. These
MIBs are mostly intended for test purposes.
Note 3: Two 10 bits DACs (using bits 2…10 – 0x0FFC) are used to generate TCXO / OCXO
ref voltage.
HIGH-DAC is multiplied by 16 to generate ref voltage. Therefore:
• Read MIB value is found by: ( (
HIGH-DAC >> 2) x 16 ) + (LOW-DAC >> 2).
• Write MIB value:
LOW- and HIGH-DAC values are found by reverse calculation.
Ver >= 31.0.1: The function to find
DAC values is slightly changed – to make the
LOW- and HIGH-DAC values as equal to each other as possible.
• Maximum value is 0x3FF x 16 + 0x3FF = 1023 x 17 = 17391.
• See also
DAC_{11 | 12 | 13 | 14 | 21 | 22 | 23 | 24}_XXX.
Note 4: RTs Ver >= 30.2.0 may also adjust the TCXO ref voltage so that its own TCXO
Oscillator is running at exact
same frequency as the HUB’s OCXO Oscillator.
This function apply also to RT Main-Unit (with TCXO) operating as HUB in LISTEN Mode –
I.e. bit 15 (0x8000 –
UTILITY_CCU_LISTEN_TO_CCU) in UTL_UTILITY_MASK is enabled.
This TCXO adjust function is enabled by bit 16 (0x0001.0000 – UTILITY_ADJUST_TCXO) in
UTL_UTILITY_MASK.
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