User Manual

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OPERATING / SERVICE MANUAL RC 24T

PAQRAT RECORDING CONVERTER

SETUP & OPERATION

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

on the DA-88.

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.

DESCRIPTION

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.

Summary of content (4 pages)

PAGE 1
OPERATING / SERVICE MANUAL RC 24T PAQRAT RECORDING CONVERTER DESCRIPTION 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.
PAGE 2
FRONT PANEL DESCRIPTION 1. POWER LED. When dim, this LED indicates that you forgot to plug in the RC-24T. 2. SYNC LED. Indicates that a suitable AES/EBU (or SPDIF) sync source is plugged in. If this LED is not lit, the RC-24T is not receiving signal from a source. Check the INPUT SELECT switch to make sure the proper input is selected. The RC24T generates WORD SYNC from the AES/EBU INPUT and feeds it to the DA-88. It is necessary for the ADC (or other 44.
PAGE 3
REAR PANEL DESCRIPTION 1. AES/EBU OUTPUT. The AES/EBU OUTPUT transmits digital audio conforming to the AES/EBU standard. Digital audio exiting this Output is identical to the original digital audio fed to the AES/EBU (or SPDIF) INPUT and recorded onto the DA-88. This Output is typically connected to a D/A converter, hard disk recorder or a CD mastering system. The AES/EBU OUTPUT follows international conventions, with pin 2 hot, pin 3 negative, and pin 1 tied to chassis ground. 2. AES/EBU INPUT.
PAGE 4
OPERATING NOTES By Roger Nichols Formatting new tape. When formatting a new tape, press the CLOCK button on the DA-88 to select “INTERNAL” sync. If this is not done, interruptions to the digital Input to the RC-24T will result in an incorrectly formatted tape. After formatting is complete, press the CLOCK button on the DA88 to select “WORD” sync. Mixing to PAQRAT. The first time I used the PAQRAT was to store 20-bit mixes of Walter Becker’s solo album.