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

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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.

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On the other hand, the demodulated video signal is amplified and filtered
by a 6MHz width low-pass filter, obtaining the video signal that will be
present on the rear panel.
The demodulator has to independent video signal outputs, which will be
useful either to monitor the signal or to connect and fed it to two different
equipments.
In the front panel is displayed whether the received video signal is
synchronized or not. If video signal is not synchronized, the LED next to the
ALARM button lights. From the front panel keypad and display video level
can also be changed.
Besides, the external input signal meter displays the input signal level
which can be very useful while installing and aligning the link antennas. It
also has a video signal detector.
The VR-70 demodulator and repeater can be fed can be fed either by and
AC source between 100 and 240V and 50 to 60Hz frequency or by a 12V
DC source (battery).
The receiver internally generates +10V, -10V and +5V supply voltages
required to fed the different boards of the equipment.
The figure below shows VR-70 receiver’s block diagram:

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VR-70 and DCM User’s Manual Page 12
Figure 1.1 VR-70 Receiver’s block diagram

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VR-70 and DCM User’s Manual Page 13
2. Connections
The figure below shows every connection of both, VR-70 demodulator and
DCM up-converter.
Figure 2.1 VR-70 demodulator and DCM Down-converter connections
2.1 Power Supply
The VR-70 modulator can be feed by and AC source between 100 and 240V
or by a DC source of 12 to 14V. The -48V power supply is optional; range
from -36 to -72V.
When the equipment is fed by an AC source, this is connected to a switched
power supply that gives a 12V/4,2A output.
The power-supply board receives either the 12V supply from that power
source or a DC voltage between 12 and 14V from the DC power input.
Then, converts the input to the supply voltages required by the equipment:
+5V, +10V, +12V, -12V and +24V. In this way, the equipment can be fed
by a 12V voltage signal coming from a battery.
The equipment has a power supply that operates when the equipment is
fed with 220V AC to feed all the receiver’s modules. The output current of

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VR-70 and DCM User’s Manual Page 14
this power supply is 4,2Amp to be able to feed any up-converter type
including the most powerful ones, when working as a repeater.
The mains frequency should be between 50 and 60Hz.
The maximum input consumption in 220V is 0,8A.
In the AC input, the equipment has 2 fuses, one external of 2A on the rear
panel and other inside of 3A located in the power supply.
When the equipment is 12V DC input feed, this supply voltage directly
reaches receiver’s every module and it has a 4A fuse in the rear panel.
AC mains input uses a MLC Neutrik connector. The cable required to
connect to the AC main is supplied with the equipment. AC power connector
used in this equipment is designed to prevent accidental disconnection. To
extract the connector, pull back the locking and rotate the connector, as
indicated in the connector itself
The DC power supply is connected via a Neutrik 4-pin male XLR connector
with a safety clip to prevent accidental disconnect.
XLR-4 male connector pinout to connect it to DC power supply
PIN-1: negative
PIN-2: free
PIN-3: -48V (optional)
PIN-4: from +12 to +14V
The equipment is protected from reverse polarity and 15V overvoltage.
It is not advisable to use a power lead with a cross-section smaller than
that of the lead supplied, since this would cause a drop in the supply
voltage and deficient operation of the equipment.
2.2 Video
To connect video signal a 75ΩBNC connectors are used. These connectors
are located on the rear panel and they are labelled as VIDEO OUTPUT 1 and
VIDEO OUTPUT 2. The transmitter input impedance is 75Ω. Both outputs
are equal and independent. If one output is loaded or in short-circuit that
does not have any effect on the other output. Maximum output level is
1Vpp over 75Ω, Standard level.
SVP Broadcast Microwave recommends the use of RG-59 video cable. If this
type is not used, we recommend that the cable used does not attenuate the
high frequencies of the video signal. Once the video cable has been
selected, it is important to determine the length required. For cables longer
than 50m, it is advisable to check the cable and the losses that occur in it

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VR-70 and DCM User’s Manual Page 15
It is important that 75Ωconnectors are used. This is because the female
output connector of the VR-70 demodulator unit may be damaged and
because an impedance mismatch will occur.
If the received RF signal does not carry a video signal, the display in the
demodulator unit will display VIDEO: OFF and the led next to the ALARM
button flashes red. This way the user knows that video signal is not been
inserted in the transmitted signal or that there might be a failure in the
video source and/or the connection cables. When input video signal is
detected, the led next to alarm button is switched off (if there are no more
alarms) and in the display appears VIDEO: ON.
2.3 Audio
The equipment is delivered with the output configuration below:
Maximum line level +12dBm, balanced output on 600Ω.
Because the audio signal is balanced, its level is measured between 2nd
and 3rd pins.
The VR-70 has two audio outputs, available on 3-pin male XLR
connectors on the rear panel.
XLR-3 pinout is:
PIN-1: ground
PIN-2: hot (+)
PIN-3: cold (-)
The equipment has an audio meter. To visualize the measurement, the
following option in the menu has to be selected: Monitor Status: Peak Level
Meter. The operation of this audio meter is similar to the operation mode of
a picometer, since it has different integration times for ascendant (fast) and
descendent (slow) slopes. This facility is useful to measure signal peaks,
not the signal level.
2.4 Up-Converter and Down-Converter
To connect the rack-mount VR-70 demodulator unit and the DCM down-
converter a low loss 50Ωcoaxial cable should be used.
If a RG-214 coaxial cable is used the maximum cable length is 100m. Cable
length can be doubled if celflex cable of ½” is used.
High quality 50ΩN connectors are recommended in cable ends.

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VR-70 and DCM User’s Manual Page 16
The cable delivers a 70MHz signal and the DC supply voltage to feed the
down-converters.

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3. Technical features
3.1 I.F.(Intermediate Frequency)
Table 3.1 I.F Input/Output features
Item Feature
Input frequency 70MHz
Input I.F. Level from –60 to +5dBm
Output frequency 70MHz
Output I.F. level +5dBm
Frequency deviation 8MHz pp
Input/output I.F. impedance 50Ω(75Ωoptional)
Input/Output I.F. connectors N
Demodulation FM
3.2 Video
Table 3.2 Video features
Item Feature
Video output nº 2
Video connectors BNC
Impedance 75Ω
Video level 1 Vpp on 75Ω
System PAL (NTSC optional)
Video polarity Internally selectable
Signal to Noise ratio >65dB (-40dBm de RF)
Differential gain <1%
Differential phase <1º
Luminance-chrominance delay <10ns
Luminance linearity <1%
Video response 25Hz to 6MHz

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VR-70 and DCM User’s Manual Page 18
3.3 Audio
Table 3.3 Audio Features
Item Feature
Audio channel number 2 (4 optional)
Audio connector XLR-3 macho
Audio output level +13 dBm maximum
Impedance 600Ωbalanced
Subcarrier frequency from 5,5 to 9MHz
De-emphasis 50µs
Frequency response +/-1dB from 30 Hz to 15 KHz
Typical distortion <0,4%@1KHz@+12dBm
Signal to noise ratio >70dB
Video Crosstalk >65dB
Demodulation FM
Attenuation in 15,625KHz >15dB
3.4 Power Supply
Table 3.4 Power Supply features
Item Feature
AC power supply voltage 100-240 V. (50/60Hz)
DC power supply voltage 12-14 V. Negative to ground
(-48V. optional, from -36 to -72V)
AC connector Neutrik MLC
DC connector XLR-4 male
3.5 Consumption
Table 3.5 Consumption
Item Feature
AC consumption Depends on the up-converters used.
DC consumption Depends on the up-converters used.
3.6 Physical characteristics
Table 3.6 Physical characteristics
Item Feature
Dimensions 1U rack 19” depth: 360 mm
F.I. cable maximum length RG-214 = 100m

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VR-70 and DCM User’s Manual Page 19
3.7 Environmental Conditions
Table 3.7 Environmental Conditions
Item Feature
Operating temperature range -10ºC to +55ºC

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4. Front panel control
4.1 Turning on the equipment (POWER ON / OFF)
To turn the equipment on and off, keep this button pressed for several
seconds. When the equipment is turned on, the display will show the start-
up message (model and version of the equipment) for a few seconds, and
then it will display the status of the equipment (reception frequency and
reception level and transmission frequency and transmission power). This
on/off button works regardless of whether DC or AC power is used.
If the power fails while the equipment is operating, it will restart
automatically when the power returns, without being necessary to press the
on/off button again.
Figure 4.1 VR-70 Demodulators ON/OFF button
The LED next to this button indicates when the equipment is turned on.
The LED lights up in green when the equipment is turned on.
The LED flashes red when there is power into the equipment but it is
turned off.
4.2 Locking the keypad (LOCK)
This button is used to lock and unlock the keypad. When the keypad is
locked, the LED next to this button lights up in green, and stays lit until this
button is pressed again to unlock the keypad.
The purpose of this button is to prevent unwanted manipulation of the
equipment (unwanted changes to the configuration, etc).
Figure 4.2 Lock button