Vega DSP-223, Technical Manual

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Tone Remote 3
Connection Type: J14 J15 J22 J23
Balanced 600 Ohm: B B B B
Single Ended Low-Impedance: A A A A
If the microphone input of the radio is high-impedance, shielded
cable is recommended. If the radio has a high-level microphone
input, move J26 to the B position, otherwise J26 should stay in
the A position.
The balanced 600-Ohm option is only available on the DB25
connector on the rear panel; see Figure 1 for the pin-out. If the
TX Audio is set to single ended mode, it can be used from the
TX+ pin on the DB25 or can be accessed on the smaller 6-pin
rear connector. The 6 Pin connector pin-out appears in Figure 3.
2.3.2 RX Audio Connection
Set the following jumpers for the type of receive audio required:
Output Type: J24 J25 J27
Balanced 600 Ohm: B B B
Single Ended: A A A
Receive Input Impedance: J12 J13
8 Ohms A B (for a speaker output)
600-Ohm B A
10k Ohm B B
Connect the radio receiver audio output if balanced to pins 12 and 24 of the rear panel DB25. If the
receive audio is single ended pin 24 of the rear DB25 or pin 4 of the rear 6 pin connector can be used.
The audio source must be after the squelch circuit, to prevent sending continuous noise to the remote
console. If a high-impedance point in the receiver is used, shielded cable is recommended.
Note: When the speaker output is used, the radio volume control will affect the audio levels of the
DSP-223.
2.3.3 PTT Connection
Connect the radio PTT circuit to the PTT relay contact terminals. Connections on the DB25 or the 6 pin
connectors may be used. Usually the common of the relay contact switch is grounded and the normally
open contact connects to the PTT input. It is also possible to ground the common of the relay internal to
the unit by bridging the pads of JP2 with wire and soldered closed.
2.3.4 Monitor Connection
Connect the radio MON circuit to the MON relay contact terminals of the DB25 connector. Usually the
common of each relay contact switch is grounded and the normally open contact connects to the MON
input. It is also possible to ground the common of the relay internal to the unit by bridging the pads of JP3
with wire and soldered closed.
6 Pin Rear Connector Pinout
1 2 3 4 5 6
1) Ground 2) PTT-NO
3) PTT-COM 4) Radio RX
5) Radio TX 6) Power
Figure 3 6 Pin Radio Connector Pin-out