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BCJ-XJ-TRC, BCJ-XP-TRC, BCJ-XJ-A10TRC, XJ3F-TRC-BCJ, BCJ-TRC-XP3M -
BCJ-XJ-TRC -
BCJ-XP-TRC -
BCJ-XJ-A10TRC -
XJ3F-TRC-BCJ -
BCJ-TRC-XP3M
110 ohm - 75 ohm Impedance Transformers
Passively convert AES/EBU digital audio signals from 110Ω/XLR3 output to a 75Ω BNC coaxial cable and then back again to a 110Ω/XLR3 input.
Key Features and Benefits
- SMPTE 276M and AES3 transmission standards
- Coaxial transmission of 2 channel digital audio
- Allows longer cable runs than 110 ohm twisted pair
- AES/EBU signal distribution using Canare 75 ohm video patchbays
- Tech Data
- Tech Note
- Downloads
Adapter Type
| Model | Description | Standard package |
|---|---|---|
| BCJ-XJ-TRC | XLR3 (F) - BNC Jack | 1 pc |
| BCJ-XP-TRC | XLR3 (M) - BNC Jack | 1 pc |
| BCJ-XJ-A10TRC | XLR3 (F) - BNC Jack, 10dB Attenuation Pad | 1 pc |
Panel Mount Type
| Model | Description (Front - Back) | Flange Type | Standard package |
|---|---|---|---|
| XJ3F-TRC-BCJ | XLR3 (F) - BNC Jack | ITT XLR-F77 | 1 pc |
| XJ3M-TRC-BCJ | XLR3 (M) - BNC Jack | 1 pc | |
| BCJ-TRC-XP3F | BNC Jack - XLR (F) | 1 pc | |
| BCJ-TRC-XP3M | BNC Jack - XLR (M) | 1 pc | |
| XJ3F-A10TRC-BCJ | XLR3 (F) - BNC Jack, 10dB Attenuation Pad | 1 pc | |
| BCJ-A10TRC-XP3F | BNC Jack - XLR3 (F), 10dB Attenuation Pad | 1 pc |
< Panel Hole Dimensions >
< Dimensions >
BCJ-XJ-TRC
BCJ-XP-TRC
XJ3F-TRC-BCJ
BCJ-TRC-XP3M
BCJ-XJ-TRC / BCJ-XP-TRC
BCJ-XJ-A10TRC
110 ohm - 75 ohm Impedance Transformer: Input/Output Level Performance
| BCJ-XJ-TRC, BCJ-XP-TRC | BCJ-XJ-A10TRC | ||
|---|---|---|---|
| AES/EBU Transmitter ( V ) |
Transformer Out
( V ) |
AES/EBU
Transmitter ( V ) |
Transformer Out
-10dB Pad ( V ) |
| 2.0 V | 1.60 V | 2.0 V | 0.50 V |
| 3.0 V | 2.39 V | 3.0 V | 0.75 V |
| 4.0 V | 3.18 V | 4.0 V | 1.01 V |
| 4.5 V | 3.60 V | 4.5 V | 1.13 V |
| 5.0 V | 3.98 V | 5.0 V | 1.26 V |
| 6.0 V | 4.78 V | 6.0 V | 1.51 V |
| 7.0 V | 5.58 V | 7.0 V | 1.76 V |
| 8.0 V | 6.38 V | 8.0 V | 2.02 V |
| 9.0 V | 7.18 V | 9.0 V | 2.27 V |
| 10.0 V | 7.98 V | 10.0 V | 2.52 V |
Technical Note
Voltage Standing - wave Ratio (VSWR) and Return Loss
Terminating the receiving end of a limited length coaxial cable using a resistance value not equal to its characteristic impedance creates a reflected wave that returns back down the cable to the sending end. The result is interference developing between the travelling wave and the return wave which results in a standing wave that causes voltage levels to fluctuate. The degree to which terminating resistance matches the characteristic impedance is indicated using the VSWR or voltage standing-wave ratio standard shown in Fig. 1. Going hand in hand with the VSWR ratio is the return loss factor which measures the size of the reflected wave current in relation to the travelling wave current. (See Fig. 2)
Fig. 1 Voltage Distribution Over Coaxial Cable
| VSWR | Return Loss (dB) |
|---|---|
| 2 | 9.54 |
| 1.5 | 13.98 |
| 1.2 | 20.83 |
| 1.1 | 26.44 |
| 1.05 | 32.26 |
| 1.02 | 40.09 |
| 1.01 | 46.06 |
Fig. 2 VSWR to Return Loss Conversion Table