VISTEK V1638 User Manual
1
VISTEK V1638 ANALOGUE
AUDIO DISTRIBUTION
AMPLIFIER USER GUIDE
www.pro-bel.com
VISTEK V1638 analogue audio
distribution amplifier
2 Issue 8
Contents
1. DESCRIPTION...........................................................................................................3
2. INSTALLATION.........................................................................................................4
2.1 Rear Panel Connections..................................................................................4
Table 2.1.1.........................................................................................................5
Figure 2.1.2........................................................................................................6
Table 2.1.2.........................................................................................................6
2.2 Input Impedance...............................................................................................7
2.3 Input Mode........................................................................................................7
2.4 Lowpass Filter..................................................................................................8
Figure 2.4.1........................................................................................................8
3. OPERATION..............................................................................................................9
3.1 Front Panel.......................................................................................................9
3.2 LED Indications................................................................................................9
3.3 Gain Adjustment............................................................................................10
3.4 Monitoring Jack.............................................................................................11
3.5 Dart Interface..................................................................................................11
VISTEK V1638 analogue audio
distribution amplifier
HU-V1638 3
1. DESCRIPTION
The V1638 is a broadcast quality analog audio distribution amplifier which forms part of the Vistek V1600
range of interface products. It is a 3U high card which is fitted into either a V1601 or V1603 rack, from
which it receives its power. The V1638 is fully controllable by the DART remote control interface and either
the V1605 remote control panel or the Vistek ViewFind PC-based host. . A passive rear module with screw
terminal connections, is required for all signal interconnections. Rear assemblies with screw terminal
connectors providing 8 outputs and rear modules with D-sub connectors providing 10 outputs are available.
The unit accepts two differential mono audio inputs and distributes each of these signals to 5 differential
mono outputs. The card can therefore be used as a stereo 1:5 distribution amplifier. Modes whereby either
input or the sum of both inputs is distributed to 10 outputs are provided and are selected by on-board DIL
switches or the DART remote control interface.
The V1638 has 2 population options:
The base version has direct balanced inputs and outputs intended for local distribution applications.
The line version has transformer coupling on both inputs. On either version input impedance may be set to
600Ω or 20kΩ by means of on-board jumpers.
INPUTS:
Base version: 2 x balanced analog channels, Zin = 20kΩ or 600Ω, max input 28dBu
Line version: 2 x transformer coupled channels, Zin = 20kΩ or 600Ω, max recommended input
is +20dBu
OUTPUTS:
Monitoring: 3.5mm Stereo jack socket -18dBu into 600Ω w.r.t. main outputs
Main outputs: 2x5 x balanced analog channels, Z
out
£ 50Ω, max output 28dBu into 10kΩ
Resistor coupled expander panel:
A rear panel expander is available which is fitted with a 96Way DIN 41612 connector and comes
complete with a locking, cable-mounted 96Way DIN41612 plug assembly with solder bucket
terminations. The expander has 4 resistor-coupled outputs for each of the 5 main outputs for
channels A and B. Using this expander panel, the V1638 can function as a 20+20 DA when driving
high input impedances (³ 10kΩ).
The resistor coupled outputs of the expander panel should not be used to drive 600W loads
A digitally controlled gain block allows independent user control of the gain of each input channel, over a
range -95.5 to +31.5 dB. The gain is adjustable by front panel rotary switches (Local mode) or via the
DART control interface (Remote mode). Standard version offers gain resolution of 0.5dB from both
remote interface and panel, and hi-resolution version offers gain resolution of 0.25dB over remote interface
and 0.5dB from panel controls.
The input for each output group (Aout[1..5], Bout[1..5]) may be sourced from Ain, Bin or (Ain + Bin) and is
selected by on-board DIL switches (Local mode) or via the DART control interface (Remote mode).
The V1638 has an active first order lowpass filter on each input channel. Rolloff point (-3dB) may be set to
60 kHz or 120kHz by jumper option. LEDs for indication of clipping and low input for each channel are
provided.
Not more than two outputs per card may be used to drive 600Ω loads at +20 dBu or more
VISTEK V1638 analogue audio
distribution amplifier
4 Issue 8
The V1638 is compatible with the Vistek DART remote system, allowing card ID, status, gain and input
selection to be read and gain and input selection to be set by a DART compatible rack controller.
2. INSTALLATION
2.1 Rear Panel Connections
The 3U screw terminal and DSUB rear panels are shown below. 1U panels are similarly marked. Table
2.1.1 details connections to these standard panels. Figure 2.1.2 and Table 2.1.2 describe signals and
connections to the DIN41612 cable mounted plug supplied with the resistor-coupled expander panel. Note
that these pin numbers refer to those stamped on the back of the supplied cable-mount connector with
solder bucker terminals:
A (IN)
B (IN)
A1(OUT)
A2(OUT)
A3(OUT)
A4(OUT)
B1/A5(OUT)
B2/A6(OUT)
B3/A7(OUT)
B4/A8(OUT)
+
S
-
+
S
-
+
S
-
+
S
-
+
S
-
+
S
-
+
S
-
+
S
+
S
-
+
S
-
1
25
1
15
Audio Outputs
Audio Inputs
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