VX-2035 - Multipurpose Buffer Amplifier
The VX-2035 is a versatile dual-channel buffer amplifier offering a convenient 4-wire interface for telecommunications equipment. It provides a low-cost, portable solution for talkback and other communications using PSTN, ISDN and cellular services, and can also serve as a stand-alone mic, headphone or buffer amplifier with the optional 2035-C4 cable.
The VX-2035 is battery or mains operated and has switchable phantom-powered mic / line level input plus both balanced line and headphone outputs. Input and output levels are adjustable, and transmission mode can be switched between send, receive and full duplex. The bypass switch allows conventional communication on the telephone's handset connected via the front panel.
Used in conjunction with a standard PSTN or ISDN telephone the VX-2035 offers similar capabilities to a hybrid. By connecting the handset to the telephone via the VX-2035, audio is intercepted and correctly buffered and balanced to provide the send / receive connection. Interface to portable telephones is achieved by connecting the VX-2035 via the cellphone's hands-free car kit using a special cable. This allows integration of conventional studio equipment to provide audio backup and talkback without the need for either telephone line or mains power. Special versions can be built to order, including multi-channel rackmounted arrangements.
| Specifications |
| Audio: |
| Audio input |
Mic / line switchable |
| Mic input range |
-20dBu to -60dBu, front-panel adjustable |
| Line input range |
0dBu to -20dBu, front-panel adjustable |
| Mic phantom power |
Internal jumper-configurable for electret mic |
| Audio output |
3-pin XLR male, low-Z (<45ohm) |
| Headphone listen output |
¼" jack socket |
| Audio output level |
0dBu, front-panel adjustable ±10dB |
| Mode selection |
Duplex, send only or receive only, by front panel switch |
| Output balance |
>35dB (IEC 268-3/23.2.2.2) |
| THD & noise |
<0.05% (@ +16dB, VDD/VSS @ 9V) |
| Noise |
-84dBqp (CCIR 468-2 weighted, 0dB gain) |
| Crosstalk |
<-70dB (@ 15kHz) |
|
| Telephony: |
| Handset connector |
RJ-11 on front panel |
| Handset selector |
Front panel handset / 4-wire switch |
| Telephone connector |
RJ-45 / RJ-11 rear panel, audio to / from phone plus direct interface to ISDN Connect (Blue Phone) |
| Ancillary power output |
Selectable ±9V on RJ-45 telephone connector |
|
| Physical: |
| Internal battery power |
2 x PP3 9V (alkaline) |
| Approximate life |
48 hours continuous (powering VX-2035 only) |
| External DC power input |
±9 to ±12V DC 5-pin DIN female |
| Power source selection |
Rear panel switch, bat / off / ext |
| Size |
59 x 155 x 91mm (HxWxD) |
| Weight |
370g approx (without batteries) |
|
| Options: |
| 2035-PSU |
Mains PSU |
| 2035-50V |
50V phantom power for microphones |
| 2035-C1 |
VX-2035 to telephone handset socket cable |
| 2035-C2 |
Power / audio cable for Blue Phone |
| 2035-C3 |
Cellphone car kit interface cable |
| 2035-C4 |
Loops VX-2035 for stand-alone use |
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