OPERATING / SERVICE MANUAL RC 24T
PAQRAT RECORDING CONVERTER
1. Connect the supplied TDIF Cable between the DB-25 TDIF-1 connector on your DA-88 and RC-24T.
2. Connect the supplied BNC Cable between the RC-24T WORD SYNC OUT connector and the WORD SYNC IN connector
3. Connect a stereo digital audio source signal (up to 24-bit) to the AES/EBU (or SPDIF) INPUT on the rear of the RC-24T.
Set the AES/EBU or SPDIF SELECT SWITCH to the appropriate position to select the proper input.
4. Connect the AES/EBU OUTPUT on the rear of the RC-24T to whatever is receiving the 24-bit digital audio signal during
playback (and monitoring).
5. Connect the supplied Rane RS-1 remote power supply to the red POWER jack on the rear of RC-24T.
6. Make sure the DA-88 is plugged in and turned on.
7. Press the DIGITAL IN button on the DA-88 to select the TDIF-1 interface as the audio signal source.
8. Press the CLOCK button on the DA-88 to select “WORD” sync.
9. Press the RECORD TRACK ASSIGN and PLAYBACK TRACK ASSSIGN buttons on the RC-24T to select tracks 1-4, 5-8,
or 1-8 (record only). Arm the corresponding tracks on the DA-88 for recording.
10. Record and play back tracks on the DA-88 as normal, using the AES/EBU (and SPDIF) input and output on the RC-24T as
the source and destination for the 24-bit digital audio signal.
The RC 24T (or “PAQRAT”) allows you to record and play back stereo digital audio signals with up to 24 bits of resolution
using your Tascam DA-88 modular digital multitrack.
The RC 24T accomplishes this task by converting the AES/EBU (or SPDIF) stereo 24-bit digital audio source signal to four
16-bit channels compatible with Tascam’s proprietary “TDIF-1” DA-88 interface. The RC 24T simultaneously writes these
signals onto the DA-88 and reads them back off again. Controls on the front panel allow you to assign these four channels to
tracks 1-4, 5-8, or 1-8 (two identical groups of four tracks) on the DA-88. The odd tracks carry the upper 16 bits of the original
digital audio signal, and the even tracks carry the lower eight bits plus a -20dB reference tone.
Note: Although it is nearly impossible to achieve better than 20-bit performance from today’s A/D converters, we refer to
the high resolution inputs and outputs to/from the PAQRAT as 24-bit anyway, just to simplify things. You can interface any
AES/EBU or SPDIF signal to the input and output of the PAQRAT from 1 to 24 bits.
