8 | | | | Vega’s C-2002 |
Console # | J8 Position | Impedance | Impedance | Loss (dB) |
1 | A | 604 | 604 | 0.0 |
2 | B | 10k | 569 | -0.5 |
3 | B | 10k | 539 | -1.0 |
4 | B | 10k | 511 | -1.5 |
5 | B | 10k | 486 | -1.9 |
6 | B | 10k | 464 | -2.3 |
Level adjustment can be made to the receive audio by entering the setup mode or adjusting the RX level POT inside the C-2002.
4.2.6TX Side Settings
The C-2002 TX output circuitry has a DPDT relay that is used to connect and disconnect the TX output transformer from the TX line based on PTT status. This allows a very large number of consoles to be attached to the line in parallel, because only the transmitting unit will be directly connected to the line. When not transmitting, the DPDT relay is connected to 600 ohms or open circuit depending on the number of console connected in parallel to the line. If only one console is attached, this unit should have J16 (Line 1) or J26 (Line 2) in the “A” position. This makes it the effective master and terminates the line with 600 ohms. If there are more than one console connected in parallel, one console should be designated as the master by placing J16 (Line 1) or J26 (Line 2) in the “A” position and the remaining consoles should be designated as a slave and should have J16 (Line 1) or J26 (Line 2) placed in the “B” position. In this manner, the impedance looking back into the parallel configuration of consoles is still 600 ohms. Figure 7 shows the basic configuration. The C-2002 could also be the master in this configuration. NOTE: If any of the consoles connected in parallel are not C-2002’s, then all the C-2002’s should be configured as slaves. Additionally, J2 (Line 1) or J4 (Line 2) should be used as a TX line impedance correction if there are consoles other than the C-2002 connected in parallel. J2 (Line 1) or J4 (Line 2) position “B” adds another 600ohms to the output TX line. J2 (Line 1) or J4 (Line 2) Position “A” is straight through.
Master | Slave | Slave | Slave |
J12 POS A | J12 POS B | J12 POS B | J12 POS B |
600 | open | open | open |
ohms | | | |
C2000 Multiple Console Configuration
Leased
Line
Figure 7 Master/Slave Console Configuration.
4.2.7Transmit Monitor
In a four-wire system with parallel consoles, the transmit line may be monitored. Refer to section 4.3.2, the monitor level setup on adjusting the level. The transmit monitor is not needed in two-wire mode as the transmit audio is already on the receive circuit. The transmit monitor, in 4 wire mode, is used to detect transmit activity for the TX Detect LED.
