Quasonix TIMTER Installation And Operation Manual page 20

Legacy Modulation
(BPSK)
Legacy (QPSK, OQPSK)
*Maximum data rates on Quasonix transmitters are limited by the equipment used to test the transmitter.
Experiments and simulations suggest that the transmitters can generate "high fidelity" PCM/FM up to about 40
Mbps, and SOQPSK and ARTM CPM up to about 80 Mbps. However, our test station demodulators cannot run
above the specified 23 Mbps and 46 Mbps rates, so performance above those rates is unspecified.
1.3.23 Internal Clock and Data Option – ID
The ID option allows the CS user setting to be reloaded on power up or on a manual recall of a setup. Without the
ID option, CS is forced to 0. Refer to the CF option for information about the Clock Free option.
1.3.24 Limited Current Option — LC
This option is used to specify low current in the RF Off state. Current draw is less than 10 mA when the transmitter
is Off. This is a hardware option.
1.3.25 Forward Error Correction / Low Density Parity Check (LDPC) Option – LD
This option provides the Low Density Parity Check (LDPC) encoding, which is being considered for use on the
iNET program. LDPC has been adopted by the Range Commander's Council, IRIG 106-17, Appendix 2-D.
1.3.26 Forward Error Correction / Low Density Parity Check (LDPC) Option – LD6
This option adds the extended LDPC option to the unit. It lets the user select from the six implemented LDPC codes,
and allows the randomizer command to select the CCSDS randomizer, if LDPC is enabled. Adding this option
automatically enables the existing LD option.
The IRIG standard calls out six variants of LDPC codes—all combinations of two different information block sizes
(k=4096 bits and k=1024 bits) and three different code rates (r=1/2, r=2/3, and r=4/5).
1.3.27 Low Bit Rate Option – LR
The standard TIMTER™ supports bit rates from 0.1 to 28 Mbps in SOQPSK-TG and MULTI-h CPM modes, 0.05
to 14 Mbps in PCM/FM (Tier 0) mode and in all legacy modes. The LR option decreases the bit rate to a minimum
of 50 kbps (25 kbps for PCM/FM). (The minimum bit rate with a Clock Free transmitter is 50 kbps for all modes.)
Refer to the CF option for information about the Clock Free option. Refer to Table 11 for bit rate comparisons by
mode.
12 Quasonix, Inc.
Standard Bit Rate With Low Rate Option
0.05 — 10 Mbps
0.05 — 20 Mbps
K=4096, r=1/2
k=1024, r=1/2
k=4096, r=2/3
k=1024, r=2/3
k=4096, r=4/5
k=1024, r=4/5
TIMTER™ Multi-mode Dual
Telemetry Transmitter
With High Rate Option
-LR
N/A
N/A
-HR*
N/A
N/A