TIMTER™ Multi-mode Digital Telemetry Transmitter
62
Quasonix, Inc.
Use the BBCK command to see the actual current clock rate being used.
Also refer to Appendix C – Understanding Clock/Data, AC, and BR.
For details about specific commands, refer to AC, BBCK, CF, or IC.
4.2.1.1.4 Baseband Interface Type - BT
BT sets the baseband interface type using the following options:
T = TTL single ended, bias 1.65V
R = RS422 differential input
This command is only valid if the transmitter has the VR option which now includes interface types D, M, or S.
If the unit has the EG option
, the BT command and the VR option are not allowed.
4.2.1.1.5 Convolutional Encoder
– CC
Convolutional encoding is a form of legacy forward error correction. It requires more bandwidth than all but the
lowest rate LDPC codes, and its error correcting performance is inferior to LDPC. If possible, LDPC is the preferred
FEC. CC is mainly used with legacy PSK modes.
4.2.1.1.6 Clock Generator Source Select Command
– CG
CG is only active if the unit has the -CG option. CG 0 is the default to match legacy units.
The CG command allows the user to pick one of the following for the clock generator output source:
0
Clock Gen output Off
1
Internal clock always
2
External clock always
3
Clock Free clock always
4
Active clock:
Internal clock if CS = 1
External clock if (CS = 0, CF = 1)
Clock Free clock if (CS = 0, CF = 0)
Syntax: CG 1 // Set CG output to external clock always
CG ? // Display the choices
4.2.1.1.7 Frequency Offset
– FO
This command is no longer supported. Transmitters with the FO option can be tuned with 1 Hz resolution using the
FR (frequency) command.
Examples:
SOQPSK>FR 2200.2
Freq set to 2200.0 MHz
Freq offset set to 0.200000 MHz
