SVP VR-70 User manual

SVP
Broadcast
Microwave
VR-70 & DCM-1070
User’s Manual
V 1.1
10GHz Receiver

Preliminary pages
VR-70 and DCM User’s Manual Page 2
Contents
Chapter 1: VR-70 Demodulator and Repeater
The objective of this first part is to provide a detailed description of the DR-
100 series receivers. First of all, there is a theoretical explanation of how
the equipment works. Secondly, a description of its main characteristics
and options is given. Finally, information of how to operate the equipment
is provided.
Chapter 2: DCM-1070 Multi-frequency Down-Converter
This second chapter describes the operation mode, options and main
characteristics of the DCM-1070 multi-frequency down-converter.
Chapter 3: Parabolic antenna Installation
The target of this third section is to describe how to do the installation of
the parabolic antenna for a point to point link.
Firstly, a general description of the assembly is given. Next, there is a more
extensive description offered by the manufacturer himself.
Chapter 4: MD-70 Signal External Meter
This last part, aims to give a general explanation of the options and
characteristics of the signal external meter.

Preliminary pages
VR-70 and DCM User’s Manual Page 3

Preliminary pages
VR-70 and DCM User’s Manual Page 4

Preliminary pages
VR-70 and DCM User’s Manual Page 5
DEAR CUSTOMER
We would like to thank you for selecting this equipment, and welcome you
to the SVP’s growing family products.
We are sure that the addition of this equipment to your existing installation
will cause you nothing but satisfaction.
Please read these instructions carefully, and keep them in hand in case you
have to refer to them.

Preliminary pages
VR-70 and DCM User’s Manual Page 6
IMPORTANT NOTES
1. While installing the VR-70 Demodulator, the DCM Down-converters
and/or the UCM Up-converters, the power supply of the down-converters
and the up-converter should be disabled in the Setup configuration menu
(line no.6 and 13 respectively) of the rack-mount modulator, to avoid
short-circuit risk.
2. Audio subcarriers of frequencies lower than 7,02MHz are not compatible
with 6MHz PAL-D system.
3. The VR-70 repeater and demodulator is able to transmit 6MHz PAL-D
signal.
4. There is an incompatibility in the Audio1 subcarrier frequency between
PAL-BG and PAL-D standards equipment.
5. High performance levels, in terms of audio, video and radio frequency,
that this equipment is capable of providing, can only be guaranteed if high
quality cables and connectors are used.
6. To prevent unwanted manipulation of the VR-70 Demodulator rack-
equipment, a Torx TX20 screwdriver has to be used to remove the upper
cover. An example of such a screwdriver is the Wera brand 367 BO model.
7. SVP Broadcast Microwave has approved Rosenberg and Suhner video
and RF connectors. If these brands are not used, select another high quality
brand.
8. SVP Broadcast Microwave has approved Suhner and Draka intermediate
frequency, radio frequency, video and audio cables. If these brands are not
used, select another high quality brand.
9. Signal level in the down-converter is more precisely measured with the
MD-70 signal meter than with the demodulator.
10.Performance figures of this equipment should be measured after it has
been in continuous operation for 2 hours.

Chapter 1
VR-70
Demodulator & Repeater

Chapter 1: VT-70 Modulator
VR-70 and DCM User’s Manual Page 8
Contents
1. Theoretical Operation ....................................................................10
2. Connections .................................................................................13
2.1 Power Supply ..........................................................................13
2.2 Video......................................................................................14
2.3 Audio .....................................................................................15
2.4 Up-Converter and Down-Converter .............................................15
3. Technical features.........................................................................17
3.1 I.F.(Intermediate Frequency) ..................................................... 17
3.2 Video......................................................................................17
3.3 Audio .....................................................................................18
3.4 Power Supply ..........................................................................18
3.5 Consumption ...........................................................................18
3.6 Physical characteristics ............................................................. 18
3.7 Environmental Conditions ..........................................................19
4. Front panel control........................................................................ 20
4.1 Turning on the equipment (POWER ON / OFF) ..............................20
4.2 Locking the keypad (LOCK)........................................................20
4.3 Remote control (REMOTE) .........................................................21
4.3. Alarms (ALARM)...................................................................... 21
4.4 Menu......................................................................................21
4.5 UP, DOWN, LEFT, RIGHT, ENTER ................................................ 22
5. Rear panel connectors and fuses..................................................... 23
5.1 AC power supply (POWER AC).................................................... 23
5.2 AC Fuse (FUSE A.C.).................................................................23
5.3 DC Power input (POWER D.C.) ................................................... 23
5.4 Remote control connector (ETHERNET)........................................ 23
5.5 Audio 1 output connector (AUDIO 1) ...........................................23
5.6 Audio 2 output connector (AUDIO 2) ...........................................24
5.7 Audio3 output connector (AUDIO 3) ............................................ 24
5.8 Audio 4 output connector (AUDIO 4) ...........................................24
5.9 Video output 1 (VIDEO 1)..........................................................24
5.10 Video output 2 (VIDEO 2) ........................................................24
5.11 Up-Converter output (UP-CONVERTER)...................................... 24
5.12 Down-Converter input (DOWN-CONVERTER) ..............................25
6. Local control of the equipment........................................................26
6.1 Introduction ............................................................................26
6.2 Using equipment’s menu ........................................................... 27
6.3 “Monitor Status” Menu .............................................................. 28
6.4 “Setup configuration” menu .......................................................30
6.5 Alarms and/or warnings menu ................................................... 35

Chapter 1: VT-70 Modulator
VR-70 and DCM User’s Manual Page 9
List of figures
Figure 1.1 VR-70 Receiver’s block diagram...........................................12
Figure 2.1 VR-70 demodulator and DCM Down-converter connections ......13
Figure 4.1 VR-70 Demodulators ON/OFF button .................................... 20
Figure 4.2 Lock button ......................................................................20
Figure 4.3 Remote control button ....................................................... 21
Figure 4.4 ALARM button ................................................................... 21
Figure 4.5 MENU button ....................................................................21
Figure 4.6 Menu navigation controls .................................................... 22
Figure 5.1 Back view of the rack-mount VR-70 demodulator ...................25
Figure 6.1 Equipment local control configuration ...................................26
List of tables
Table 3.1 I.F Input/Output features ....................................................17
Table 3.2 Video features....................................................................17
Table 3.3 Audio Features ................................................................... 18
Table 3.4 Power Supply features.........................................................18
Table 3.5 Consumption ..................................................................... 18
Table 3.6 Physical characteristics........................................................18
Table 3.7 Environmental Conditions ....................................................19
Table 6.1 “Monitor Status” menu ........................................................28
Table 6.2 “Setup Configuration” menu.................................................31

Chapter 1: VT-70 Modulator
VR-70 and DCM User’s Manual Page 10
1. Theoretical Operation
The VR-70 demodulates an Intermediate Frequency (I.F.) signal into a
video and two audio signals. This equipment also allows re-sending the
signal acting as a repeater.
A 70MHz I.F. signal coming from an external down-converter or an external
standard FI signal from another link system is fed into the VR-70. This
equipment demodulates the I.F signal. Besides, connecting an up-converter
is also possible. The VR-70 can re-send the I.F. signal to another node and
there is no need to demodulate it.
Every type SVP up-converters and down-converters, in terms of output
power and frequency, can be used with the VR-70 demodulator and
repeater.
Once fed the IF signal into the VR-70, the signal is filtered by a band-pass
active filter and then, amplified by a logarithmic amplifier. The output
signal obtained after this process has a 0dBm constant level.
The logarithmic amplifiers used provide a linear DC voltage depending on
the signal input level. This signal is visualized in the frontal panel display;
the display is calibrated to show the signal level in dBm.
Afterwards, the amplified signal is fed into a FM demodulator, which the
delivers the base-band signal.
On one hand, the base band signal is inserted into a two subcarrier audio
demodulator, and on the other hand to the video processor.
The audio demodulator has two parts one for each audio channel. On each
audio input, before the demodulator, there are a high-pass filter, and a
colour video band-stop filter, in 4,43MHz.
Then, the audio signal is converted to 10,7MHz. As a local oscillator a
quartz crystal is used. If we want to change the signal’s frequency, the
crystal has to be changed.
Quartz crystal’s frequency has to be:
Quartz crystal’s frequency = Received frequency + 10,7MHz
Afterwards, the signal is FM demodulated and the audio signal is obtained.
Now, the audio signals can be adjusted from the keypad and display in the
front panel.
The output audio signal is balanced and line level. The maximum output
level is +16dBm on 600Ω. The equipment is adjusted to deliver +12dBm
audio signals with a 200 KHz peak to peak deviation.