-
BJ-JR -
BJ-JRU
50 ohm BNC Receptacles
CANARE 50 ohm BNC jack to jack receptacles.
Key Features and Benefits
- For panel mount.
- Two types: Standoff type and Flush-mount type.
- Tech Data
- Tech Note
- Downloads
Standoff
| Model | Description | Standard package |
|---|---|---|
| BJ-JR | Jack to Jack | 20 pcs |
Key Features and Benefits
- Mounting hole size is same as that for BCJ-R/1 connector
Flush-mount Receptacles
| Model | Description | Flange Type | Standard package |
|---|---|---|---|
| BJ-JRU | Jack to Jack | ITT XLR-F77 | 20 pcs |
| BJ-JRUD | Neutrik D |
Key Features and Benefits
- Two types of flanges are available.
- Flush-mount receptacle prevents damage on the jack.
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
