Promax PROLINK-7 User Manual
TV & SAT LEVEL METER
1 GENERAL INFORMATION
1.1 Description
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PROLINK-7
PROLINK-7
The
of frequencies covered - 5 to 862 MHz and 920 to 2150 MHz - makes it an excellent
instrument for
Television', where the subband tuning margin, from 5 to 45 MHz, enables the user to
carry out tests on the return channel),
('Very Small Aperture Terminal')
analysis (38.9 MHz).
The
adopting, apart from the characteristic parameters of the standard, the correcting
automatic system to obtain in all the cases an accurate measuring of the input signal
level. It admits any TV system (
directly with
carrier-to-noise ratio (
modulation: QPSK, QAM or OFDM). Being a multistandard instrument, it can be
efficiently used in any country of the world. Its accuracy and reliabilit y mee t the needs
of the most demanding users.
Its design featuri ng a microprocess or-based
OSD
the
and parameters configured by the user, enables him to adapt its
with
to optimise the process of measurement; for example, continuous frequency
the correction of linearity and flatness errors, the appropriate selection of the
attenuators, and the automatic cut-off after the device has been inactive for a certain
period of time. To enhance its convenience of use, it has
different measuring configurations: name of broadcasting station, frequency, units of
measurement, standard, power supply to external units, frequency of the sound
subcarrier and kind of measurement (level, V/A or digital carrier). Moreover, the
DATALOGGER
(99 configurations x 99 different signals) that makes it much easier to test systems in
which a large number of measurements have to be made, and enables further
processing of all the information acquired.
absolute values and, optionally, on an analogue bar shown superimposed on the
monitor image, that facilitates the de tec tion of th e m ax imu m level. Mo re ov er, in the LV
sound mode, the loudspeaker emits a tone whose frequency depends on the level of
the signal received, which is very useful when installing antennas. It is also possible
to display on screen the line synchronism pulse like on an oscilloscope screen.
('On Screen Display') function that displays on screen the different functions
remarkable ease
A modern µP automatically handles a large part of the operations necessary
The signal level measured is indicated numerically on an LCD display, in
FM radio, terrestrial TV, cable TV (CATV
PR OLI NK-7 includes the main TV standards: M , N, B, G , I, D , K a nd L,
digital TV
function permits the acquisition and storage of up to
is the most advanced of the
satellite TV, MMDS microwave links, VSAT
systems, digital TV
PAL, SECAM
signals for which it provides directly the measuring of power,
C/N
) and bit error rate (
.
PROMAX
NTSC
and
BER
) (this last according to the required
intelligent control system
level meters. The range
, 'Community Antenna
intermediate frequency
and
) and allows the user to work
a dvance d c apabilities
99 memories
to store the
9801 measures
along with
synthesis
,
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The selection of sound subcarrier is automatic, depending on the standard, or
tunable between 4 and 9 MHz. When decoding TV sound it is possible to choose
between the
includes a
NARROW
NICAM
and
WIDE
filter to obtain the best carrier discrimination. It
decoder that provides the indication of the bit error rate (
BER
) and
the type of sound received (STEREO/DUAL). Moreover, the possibility to com mute the
channel that is delivered to the loudspeaker enables the user to check the sound
stereo and dual.
The
PROLINK-7
level is only one of its multiple functions.
of the
line synchron ism pulse
A
EUROCONNECTOR
is a highly advanced instrument in which the measuring of
Teletext, spectrum a nalyse r function
, display
are so me of t he pos sibilities p rovided.
has been also i ncl uded wit h i nput /out put of audi o/ vi deo.
The o utput of sate llite video on base band allows the use of D2-MAC decoders and
others.
The instrument is mains powered or with a rechargeable battery, and it is also
possible to supply different voltages to the external unit (
terrestrial TV, and
13 V / 15 V / 18 V / 13 V + 22 kHz / 15 V + 22 kHz / 18 V + 22kH z
13 V / 15 V / 18 V / 24 V
satellite TV).
It also incorporates a
RS-232C
interface which enables the user to connect the
instrument to a PC for data recording, remote-control of the instrument and to a printer
in order to print out the measurements.
Its constructi on is bas ed on
('Intelli gent Module Interc onnection') tec hnology,
IMI
developed by the PROMAX R & D team, that allows easy updating of the instrument
by incorporating new functions and optional cards with a high degree of flexibility.
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1.2 Specifications
TUNING
Spe ctrum bands
Sub-band
VHF
UHF
SAT
FM
IF input
Tuning mode s
Indicator
Resolution
Automa tic se arch
Memory
Da ta Logger function
LEVEL MEASUREMENT
Measurement range
Terrestrial TV & FM bands
S a te llite T V ba n d
SPECTRUM mode
S a te llite ba n d
T erre stria l bands
Bandwidth
Reading
Digital
Analogue
Attenuators
T erre stria l bands
S a te llite ba n d
Input impeda nce
Measurement bandwidth
IF ba ndwidth
Audible indicator
Accuracy
Sub-band
T erre stria l bands
S a te llite ba n d
RF output
Inse rtion losse s
Variable span
Te rre st. bands
S a te llite ba n d
F ull sp a n
Terrestrial
Satellite
Digital frequency synthesis. Continuous tuning from 5 to
862 MHz and from 920 to 2150 MHz.
Sub-band 5 - 45 MHz
LOW band 45 - 170 MHz
HIGH band 170 - 450 MHz
UHF band 450 - 862 MHz
SAT TV 1st IF 920 - 2150 MHz
FM band 87 - 109 MHz
38.9 MHz
Frequency, channel or memory. On demand channel
table
LCD alphanumeric display
62.5 kHz in TV and FM
500 kHz in SAT
Selectable threshold
99 configurations
9801 measurements
20 dBµV to 130 dBµV (10 µV to 3.16 V)
30 dBµV to 120 dBµV (31.6 µV to 1 V)
30 dBµV to 120 dBµV (31.6 µV to 1 V)
20 dBµV to 130 dBµV (10 µV to 3.16 V)
100 kHz, 230 kHz or 1 MHz selectable
100 kHz, 230 kHz or 4 MHz selectable
1 MHz
4 MHz
Auto-range or manual selection
Absolute value calibrated in dBµV, dBmV, dBm or V
Relative value: analogue bar on the screen
0 to 80 dB, AUTO (10 dB steps)
0 to 70 dB, AUTO (10 dB steps)
75 Ω (BNC)
230 kHz (terrestrial bands) 4 MHz (satellite band)
(maximum band ripple 1 dB).
300 kHz (TV) 27 MH z (SAT)
A tone that varies with the signal level
±1.5 dB (50-120 dBµV and 5-45 MHz) (22ºC ± 5ºC)
±1 dB (30-120 dBµV and 48.25-861 MHz) (22ºC ± 5ºC)
±1 dB (40-100 dBµV and 920-2050 MHz) (22º C ± 5ºC)
75 Ω (BNC)
22 dB typical, with 10 dB RF INPUT attenuator
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Ma ximum signa l
RF input
From DC to 100 MH z
From 5 to 2150 MHz
Vide o input
MONITOR DISPLAY
CRT
Synchronism and Burst
Spe ctrum function
M onitor type
Sensitivity
50 / 6 0 H z synchronism
S a te llite ba n d
T erre stria l band
VIDEO SIGNAL
Exte rnal video input
Sensitivity
Vide o output
Base ba nd video SA T output
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50 V rms (powered by the mains supply)
30 V rms (not powered by the mains supply)
130 dBµV
3 Vpp
B/W, 5 ½ inches
Display through displacement of the picture
Variable span in selected band
B/W TV, according to the standards M,N,B,G,I,D,K ,L
40 dBµV for co rrect synchronism
Selection of frame frequency between 50 and 60 Hz
Selection according to the standard
BNC, Euroconnector (automatic selection)
1 Vpp (75 Ω) positive video
BNC, Euroconnector (75 Ω)
BNC, 1 Vpp (75 Ω)
IF OU TPU T
SOUND
Input
Output
Demodulation
De-emphasis
Subcarrier
Variable
Fixed
BNC (75 Ω)
Euroconnector
Speaker, Euroconnector, external headphone
AM, FM, TV and NICAM, selectable
50µs
Digital frequency synthesis
From 4 to 9 MHz, 10 kHz resolution
According to the standard selected: 4.50, 5.50, 5.80,
6.00, 6.50, 6.65, 5.74, AM , FM, LV, OFF.
TELETEXT
INTERFACE RS-232C
POWER TO EXTERNAL UNITS
Decodes at 1.5 level
Through the RF input connector
T erre stria l TV
S a te llite T V
22 kH z signa l
Voltage
Frequency
Ma ximum power
External or 13/15/18/24 V
External or 13/15/18 V
Selectable
0.6 V ±0.2
22 kHz ±4
5 W
POWER SUPPLY
Battery
Autonomy
12 V / 6 Ah
Better than 1 h 30 minutes (without external units
powering)
Re cha rging time
Mains
Consumpti on
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From 7 to 8 hours starting from a complete discharge
100 to 250 V AC/50-60 Hz
95 W
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OPERATING ENVIRONMENTAL CON DITIONS
M a x. a ltitude
Temperature range
M a x. re la tive h um idity
2000 m
From 5 to 40 ºC
80 % (up to 31 ºC),
decreasing lineally up to 50% at 40 ºC
MECHANICAL FEATURES
Dimensions
Weight
ACCESSORIES INCLUDED
DC-243 Carrying bag
CA-05 Power cord
Ω
ZB-75 75
VI -1 7 Vie wing hood
CB-068 12 V, 6Ah, rechargeable battery
AD-051 BN C/M-"F"/F adapter
BNC/TV BNC/M-ANT/H adapter
1 spare fuse 5x20 mm - 2.5 A - F - 250 V - IEC127
OPTIONAL ACCESSORIES
CI-23 Portable serial printer
(BNC) load
W. 305 x H. 145 x D. 334 mm
11 kg
OPTIONS
OPT-107-15 Carrying case
OPT-107-61 Channel plans programming
OPT-107-71 BER measurements for QPSK signals
OPT-107-72 BER measurements for QAM signals
OPT-107-73 BER measurements for COFDM signals
OPT-107-91 Eastern Europe Teletext
OPT-107-92 Arab and Hebrew Teletext
OPT-107-93 Turkish and English T eletext
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2 SAFETY RULES
* Use this equipment connected
connecte d to ground potential
* This is a
corresponding
* This equipment can be used in
only to systems with their negative of measurement
.
equipment, for safety reasons plug it to a supply line with the
class I
ground terminal
.
Ca tegory II
installations and
environments.
* When using some of the following accessories
ensure safety.
Rechargeable battery
Power cord
* Observe all
specified ratings
* Remember that voltages higher than
* Use this instrument under the
*
The use r is only authorize d to
both of supply and measurement
60 V DC
specified e nvironmental conditions
or
carry out the following maintenance operations:
Pollution De gree 2
use only the specified ones
30 V AC rms
are dangerous
to
Replace the battery
Replace the mains fuse, which should be of the specified type and value
On the Maintenance paragraph the proper instructions are given. Any other
change on the equipment should be carried out by qualified personnel.
* The negative of measurement is at ground potential.
*
D o not obstruct the ve ntilation syste m
of the instrument.
* Use for the signal inputs/outputs, specially when working with high levels,
appropriate low radiation leads.
* Follow the
clea ning instructions
described in the Maintenance paragraph
06/97 PROLINK-7
* Symbols related with safety:
DIRECT CURRENT
ALTERNATING CURRENT
DIRECT AND ALTERNATING
GROUND TERMINAL
PROTECTIVE CONDUCTOR
FRAME TERMINAL
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EQUIPOTENTIALITY
ON (Supply)
OFF (Supply)
DOUBLE INSULATION
(Class II Protection)
CAUTION
(Risk of electric shock)
CAUTION REFER TO MANUAL
FUSE
06/97 PROLINK-7
3 I N ST ALLAT IO N
3. 1 P owe r S upply
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The
PROLINK-7
is a portable instrument powered by a 12 volt built-in battery.
Before taking any measurements, the battery charge must be checked. If it is low (a
voltage lower than 11.0 V), a blinking
LOW BATTERY
message will appear on the
display [14].
If the battery is very weak, the battery cut-off circuit will prevent the device from
functioning. In such a situation the battery must be recharged immediately. If the
battery is complete ly discharged, it is advisable to recharge the battery for a period of
half and hour before putting the instrument into operation again.
3. 1. 1 Ope ra ting on the ele ctrical mains supply
Although the device is designed for use as portable equipment, it can also
operate when connected to the mains power supply.
Connect the device to the mains and press the power-on switch [20]. The
field meter is now in operation and the battery will slowly rech arge.
When the unit is connected to the mains, the light indicator
The instrument can be powered by mains voltages of 100 to 250 V
AC 5 0 -6 0 H z without a voltage sele ctor.
remains on.
LINE
3.1.2 Operating on the battery
For the device to operate on the battery, disconnect the power cable and press
the power-on switch [20]. The fully charged battery can power the equipment for
more than one hour non-stop, and depending on the mode of operation, it can be
powered for up to three hours. When the
LOW BATTERY
indicator appears, the battery
must be recharged immediately.
NOTE
When operating on the battery the PROLINK-7 has no protection fuses
accessible to the user. The pow e r- supply syste m ha s a set of ele ctronic sa fe ty
devices to e nsure its proper functioning. If the instrument stops functioning, it
must be taken directly to the nearest technical assistance service to be
checked.
06/97 PROLINK-7
3.1.2.1 Charging the battery
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To fully recharge the battery, connect the device to the mains supply
pressing
the power-on switch [20]. The length of time it takes to recharge it
depends on the condition of the battery. If it is very low (the
has lit) the recharging period is about 7 hours. The
[22] indicator should remain
LINE
LOW BATTERY
without
indicator
lit.
IMPO RTANT
The lea d battery of the instrument must be kept fully charge d during pe riods
whe n it is not in use. To e nsure the be st results, the ba ttery m ust alwa ys be
fully charge d. If the e quipment is in storage or is used only occasionally for a
long period of time, it is ABSO LU TE LY N EC ESSARY to check the full-charge
functions periodically (e very six months, for exa mple), and to compe nsate for
the self-discharging effect of the battery. The rate at which a fully charged
battery self-discharges depends on the temperature. For example, at an
ambient temperature of 20º C, the battery suffers a 50% loss after 16 months,
and a t 40 º C it loses the sam e cha rge in only 5 months. If the ba ttery re ma ins
very we a k for a pe riod of several days, it cannot be recha rged since the pla tes
are sulphate d and must be repla ced.
3.2 Installation and start-up
The
PROLINK-7
field meter is desi gned f or use as a portabl e dev i ce. A carryi ng
case is supplied to simplify transport and to allow the user to take measurements
conveniently in any type of installation.
When the [20] key is pressed, the instrument is in the "automatic power-off"
mode; that is, the device is automatically disconnected fifteen minutes after the last
time a key has been pressed.
Automatic power-off mode may be deactivated by hol di ng down the [20] key
for one or two seconds when turning the instrument on. The
MANUAL POWER OFF
indication appears on the display.
06/97 PROLINK-7
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4 OPERATING INSTRUCTIONS
This instruction m anua l describes instruments with a 3 . 23 program version or
later
4.1 Description of the controls and elements
Front P a nel
Figure 1.-
[1]
[2]
[3]
[4]
[5]
06/97 PROLINK-7
VI D EO . Sta nda rd signal input of 1 V pp e xterna l video
3 Vpp maximum level. The signal is detected automatically and the monitor
switches for the screen display of the external video.
Control of the C R T brightness
Control of the C R T contrast
Control of the sound volume
SP AN . Am plitude of frequency swe ep control in spectrum mode.
When pulled out,
When pressed in,
FU LL S P AN
SPAN VARIABLE
Front panel.
, the sweep of the entire band is selected.
, it is possible by rotating it to vary the
amplitude of sweep.
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[6]
[7]
RF RF output to the interna l unit.
The LNB or antenna amplifier is supplied through this connector. BNC
connector with an output impedance of 75 Ω.
WARNING
When supplying the External Unit (LNB or antenna previous amplifiers) through
the I nterna l Unit (R e ceiver) , m ake sure tha t the cable connecte d to the RF
[6] connector corresponds to the Internal Unit, and that the RF [7]
connector is connected to the E xte rna l U nit. I f the I nterna l U nit is connecte d to
RF [7] and an External Unit voltage is selected, the PROLINK-7 and the
Internal Unit will be connected to the opposite power supplies, which may
dam age one of the two piece s of equipme nt.
RF . R F signal input.
Maximum level: 130 dBµV. BNC connector with an input im pedance of 75 Ω.
ATTENTION
Note the importa nce to protect the RF [7 ] input signal with an a cce ssory to
block 50 Vpp AC, used in CATV cables (needed to feed the amplifiers) and
remote mode.
[8]
[9]
[10]
[11]
[12]
[13]
[14]
DR AI N . E xterna l units powering light indicator
It lights when the
TUNE/SELECT. Rotary selector.
Used for continuous tuning control or to select the options associated to each
key.
SC . Sound ca rrier light indica tor
It indicates that a sound carrier at the selected frequency has been detected
in the tuned transmission.
FM S T E RE O . S te reo F M a udio light indicator
It indicates that a stereo FM transmission has been tuned.
60 H z. F rame freque ncy light indica tor
It indicates that a 60 Hz frame frequency has been selected.
EX T V ID E O. V ideo signal pre sence light indica tor
It lights up when an external video signal is present through either the
VIDEO [1] connector or through the EUROCONNECTOR [46].
Alphanume ric displa y
LCD of two lines of sixteen characters and back lighting. It indicates the level,
frequency/channel, band, name of the broadcasting station, external units
power supply voltage, the sound system, etc.
PROLINK-7
is powering the External Unit.
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[15]
[16]
Keyboard
19 keys for function selection and numerical data input.
SCREEN
Cathode ray tube of the monitor.
Keyboard
[20]
[21]
Figure 2.-
Each key is coded with the colour indicating the related type of operation:
Red
: On and off. Maximum priority.
Green
: Alphanumeric data entry. This switches the keyboard in such
a way that successive pressing of the keys is interpreted
according to the numerical value associated with each key.
Blue
: Momentary operation. This is only active while the key is held
down.
POWER
This turns on the instrument, and the user can select either manual or
automatic power-off.
BAT. Batte ry volta ge
This indicates the battery power on the display [14] in volts. Momentary
operation
Keyboard.
06/97 PROLINK-7
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[22]
[23]
LINE
Light indicator which indicates whether the instrument is connected to the
mains.
LEVEL / 0
This key allows the user to select any of the different modes of measurement.
They vary according to the standard, the band, and whether or not there is an
optional card (QPSK, QAM, OFDM).
In the terrestrial bands the following measurement modes may be selected:
Analogue channe ls:
LEVEL
VIDEO/AUDIO
CARRIER/NOISE
Digital cha nnels:
DIGITAL CARRIER
CARRIER/NOISE
BIT ERROR RATE
In the s atellite band the following measurement modes may be selected:
Analogue channe ls:
LEVEL
CARRIER/NOISE
Measurement of the video carrier level
Measurement of the video-to-audio carrier ratio
Video carrier-to-noise ratio
Measurement of the digital channel power
Digital channel carrier-to-noise ratio
Measurement of the bit error rate for QAM and
OFDM modulations (only OPT-107-72 and OPT107-73)
Measurement of the video carrier level
Carrier-to-noise ratio
[24]
[25]
Digital cha nnels:
DIGITAL CARRIER
CARRIER/NOISE
BIT ERROR RATE
When the user selects the
CARRIER
measurements is displayed on the screen.
Number 0 in SHIFT mode.
TXT / •
This selects the Teletext information. As the Teletext circuit is optional, this
function is activated only if the µP detects its presence.
Decimal point the SHIFT mode
ATT / 1
This selects the attenuation in the RF input, from 0 to 80 dB on terrestrial
bands, and from 0 to 70 dB on the satellite band, in intervals of 10 dB. There
is also an AUTO position that selects the most appropriate attenuation
according to the input signal level, in order to centre the value of reading in the
optimum scale.
Number 1 in SHIFT mode.
BIT ERROR RATE
or
Measurement of the digital channel power
Digital channel carrier-to-noise ratio
Measurement of the bit error rate for QPSK
modulations (only OPT-107-71)
VIDEO/AUDIO, CARRIER/NOISE, DIGITAL
modes, the information on these
[26]
06/97 PROLINK-7
SPECT / 2
This allows the user to switch to the TV operating mode from spectrum
operating mode and vice versa.
Number 2 in the SHIFT mode.
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[27]
MODE / 3
This key selects the operating m ode of the
different modes are available:
TV
: Monitor operating as a conventional
TV+LV
: Monitor operating as a conventional
TV+LV+SY
indicator
: Monitor operating as a conventional
indicator
on the upper part of the screen (the analogue bar).
and the
line synchronizing pulse
screen. The line synchronizing pulse appears with a lateral
displacement of the picture if a TV carrier is tuned, or if there
is an external video signal input through the VIDEO [1]
connector or the Euroconnector [40]. The analogue bar level
indicator shown on the screen has been calibrated and
corresponds to the value indicated in the display.
LV
: Indication of the
OFF
: Deactivates the monitor.
signal le v e l
Number 3 in the SHIFT mode
PROLINK-7
monitor. The following
tele vision se t.
tele vision se t
tele vision se t
, with a
, with a
level
level
displayed on the
on the screen (the analogue bar).
[28]
SOUND / 4
This selects the type of sound. The options available in each case depend on
the
band
and the
4.50
: Sound carrier 4.50 MHz above the picture carrier.
5.50
: Sound carrier 5.50 MHz above the picture carrier.
5.74
: Selects the second carrier in DUAL or STEREO transmissions, at
standard
selected.
5.74 MHz of the picture carrier.
5.80
: Sound carrier 5.80 MHz above the picture carrier.
6.00
: Sound carrier 6.00 MHz above the picture carrier.
6.50
: Sound carrier 6.50 MHz above the picture carrier.
6.65
: Sound carrier 6.65 MHz above the picture carrier.
7.02
: Sound carrier 7.02 MHz above the picture carrier.
NTUN
: Sound detection narrow filter: 110 kHz (satellite bands)
BTUN
: Sound detection broad filter: 240 kHz (terrestrial and satellite
bands).
AM
: AM demodulation.
FM
: FM demodulation.
LV
: Tone whose frequency varies with the input signal level.
NICA
: Nicam decoding
OFF
: Suppresses the audition of the sound carrier in the speaker and
headphones.
Number 4 in the SHIFT mode
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[29]
[30]
BAND / 5
Selects the band.
Although the tuning is continuous between 5 and 862 MHz and
between 920 and 2150 MHz, a band select is included which limits the
spectrum display to the commercial bands presently in use and to select a few
special cases, such as FM or IF.
SUB
: SUB-BAND. From 5 to 45 MHz
VLO
: VH F LOW. From 45 to 170 MHz
VHI
: VHF HIGH. From 170 to 450 MHz
UHF
: UHF. From 450 to 862 MHz
SAT
: S atellite T V. Fr om 920 to 2150 MHz
IF
: Intermediate frequency 38.9 MHz
FM
: FM. From 87 to 109 MH z
Number 5 in the SHIFT mode
SRCH / 6
This is the function for automatic station search. Starting at the present
frequency or channel, it searches until finds a station with an adequate level.
The threshold level can be defined by the
The search function halts the search process when the end of the band being
used is reached, if it is in frequency mode, or when any key is pressed. The
sound is deactivated during the search process. This function cannot be used
on FM and IF bands.
SEARCH LEVEL
function.
[31]
[32]
[33]
Number 6 in SHIFT mode.
mA/V / 7
This indicates on the display [14] the voltage and current being supplied to the
LNB or external amplifier.
Number 7 in the SHIFT mode.
SEL V / 8
This selects the voltage supplied to the external units (LNB or previous
amplifiers) from the
18 V and 24 V on terrestrial bands , and EX, 13 V, 15 V, 18 V, 13 V + 22 kHz,
15 V + 22 kHz and 18 V + 22 kHz on the satellite band. In the EX position no
voltage is supplied to the external unit, making it possible to supply it with an
external power source through the RF [6] connector.
Number 8 in the SHIFT mode.
CHAN / 9
This switches the display indication [14] from channel to frequency. In channel
mode the selection of the tuning frequency is adjusted to the selected channel
set (CCIR, OIRT, etc.). See the channel-frequency tables in the A appendix at
the end of this manual.
PROLINK-7
. The available voltages are: EX, 13 V, 15 V,
Number 9 in SHIFT mode.
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[34]
FUNCT
This selects the functions. When this key is pressed, a function menu with the
following fields appears on screen:
TV STANDARD
The user can select any of the various TV standards available, as a function
of the band:
B/G, D/K, I, L, M, N
band channels and
DIG
(digital channels) or
or
DIG
(digital channels) for the terrestrial
ANL
(analogue channels) for the
satellite band channels.
UN I T S : dBµV , dBm V, dBm, Lin
This selects the units of measurement in which the signal level is shown on the
display [14]. T he units may be linear (µV, mV, V) or logarithmic (dBµV, dBmV,
dBm).
CHANNEL SET
This selects one of the available channel tables.
ME AS U RE BW
This selects the bandwidth of the spectrum display filter between:
Terrestrial channels:
100 kHz, 230 kHz or 4 MHz
.
Satellite channels:
100 kHz, 230 kHz or 1 MHz
Note
: This filter is only effective in the variable SPAN mode. In the FULL SPAN
.
mode the filter is always:
4 MHz
: terrestrial band channels
1 MHz
: satellite band channels
NICAM CHANNEL
This selects the NICAM sound channel that is sent to the loudspeaker.
SAT VID EO POL
This selects the polarisation of the video carrier: positive or negative.
LNB LO C AL O S C
It defines the frequency of the local oscillator (L.O.) of the LNB used in the
receiving installation which is being studied. In the satellite band, this parameter
must be defined in order to be able to tune in the channel mode in accordance
with th e sat ellite channel-tables described in the A appendix at the end of this
manual.
CHANNEL BW
Selects the bandwidth of the digital channels. This parameter must be defined
in order to measure the power or the carrier-to-noise ratio on digital channels.
BEEP
Activates/deactivates the beeper.
AGC MODE
Activates/deactivates the automatic gain control.
06/97 PROLINK-7
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DATA LOGGER
It enables the acqui si t i on, s torage and pri nti ng of up to 9801 measurements (99
memories x 99 test points). The measurements may be taken in a fully
automatic way.
NEXT PAGE
It gives access to the next page in the function menu.
EXIT
Exit from the function menu.
CLOCK
Date and time setting.
ALARM
Selects a date and a time for automatic power on.
SEARCH LEVEL
Selects the threshold level of the automatic station search function: SEARCH
FRAME
This permits to choose the fram e frequency between 50 and 60 Hz.
[35]
[36]
[37]
[38]
[39]
PREVIOUS PAGE
It gives access to the previous page.
SHIFT
It enables the user to tune directly the desired frequency with the numerical
keyboard. When the second decimal figure is introduced, confirmation is
established. It also enables the cursor to be displaced within the menus that
appear on screen.
FA
Key for direct function assignment.
FB
Second key for direct function assignment.
START / STO
This key stores a configuration and takes measurements and/or makes printouts with the DATA LOGGER function.
SEL / R CL
This retrieves a measuring configuration and activates/deactivates
lines/columns in the DATA LOGGER function.
06/97 PROLINK-7
Side pane l
- 95 -
[40]
[41]
[42]
[43]
Figure 3.-
M ains input
Voltages from 95 to 250 V 50-60 Hz.
IF OUT. IF output at 38.9 MHz.
BNC connector with an output impedance of 75 Ω.
VI D EO O U T . C omposite video output
Amplitude of 1 Vpp and positive polarity. In the satellite band it is possible to
work with positive and negative video signals. The correct selection of this
function enables the user to view signals of either polarity. BNC connector with
an output impedance of 75 Ω.
WARNING
This signal should not be connected at circuit points with voltage, only to
standard video signal inputs with 75
instrument as a result of ignoring this precaution is not covere d in the w arranty.
S AT B B O U T . Ba s e ba nd sa te llite sig na l ou tput
The triangular modulation dispersal or Buergg is not removed. BNC connector
with an output impedance of 75 Ω.
Side panel.
Ω
impedance. Any damage to the
06/97 PROLINK-7
- 96 -
[44]
[45]
[46]
[47]
[48]
Output jack for stere o sound
RS-232C connector
Enables the remote control of the
well as data dumping to a printer.
Euroconnector
Fuse holder
Support for the mains fuse.
RESET buttom
Enables the user to restart the instrument if there is any irregularity in its
functioning. If it is necessary to reset the instrument, press the reset button with
the instrument turned off.
Display
PROLINK-7
from a personal computer, as
Figure 4.-
The alphanumeric display consists of two lines. The top line provides the
principal information.
[E] W orking frequency or channel.
[F] Input signal level.
The second line provides supplementary information.
[A] Present RF band.
[B] N am e assigned to the configuration memory. This information is only displayed
if there has been no change in the parameters of the selected configuration.
[C] LNB or external unit voltage supply.
[D] Type of sound or frequency of the selected carrier.
The numbers [17], [18] and [19] do not correspond to any part of the instrument
and have purposely been omitted from this list.
Possibly, other error m essages or indications for the user may appear on the
lower line.
06/97 PROLINK-7
Display.
4.2 Using the PRO LIN K-7
4. 2. 1 Se lection of the R F band
- 97 -
Press the
BAND/5
[29] key. By turning the
TUNE/SELECT
[9] rotary selector,
the different RF bands will appear on the alphanumeri c display [14] in sequential order.
When the desired band appears, press the
BAND/5
[29] key again.
Although the tuning is continuous between 5 and 862 MHz and between 920
and 2150 MHz, a band selection is included which limits the spectrum display to the
commercial bands presently in use and to select some special cases, such as FM or
IF.
The following are the selectable bands:
Name Corresponding ba nd F reque ncy ( M H z)
SUB SUB-BAND 5-45
VLO VHF LOW 45 to 170
VHI VHF HIGH 170 to 450
UHF UHF 450 to 862
SAT SATELLITE TV 920 to 2150
IF Intermediate frequency 38.9
FM FM 87 to 109
Table 1.-
Frequency bands.
4.2.2 Automatic transmission search
By pressing the
SRCH/6
[30] key search starts at the present frequency or
channel until it finds a transmission with a level higher than the threshold level
previously established with the
The
SEARCH
function halts the search process when the end of the present
SEARCH LEVEL
function.
band is reached, if it is in frequency mode, or when a key is pressed. In channel mode,
the search process is halted when the last channel of the group selected is reached
(see Appendix A). The sound is deactivated during the search process.
This function cannot be used in the FM bands nor in the IF ones. In the satellite
band, the search process is only available in frequency mode.
06/97 PROLINK-7
4.2.3 Frequency selection
- 98 -
When the
CHAN/9
[33] is pressed, tuning by frequenc y swit ches t o channel and
vice versa. Select tuning by frequency (the tuned frequency appears in the upper righthand corner of the alphanumeric display [14]. There are two methods for selecting the
frequency:
1.
Entering via TUNE SELECT [9] selector
With the
TUNE/SELECT
[9] rotary selec tor, sel ect the des ired fr equency (tuni ng
is continuous from 5 to 862 MHz and from 950 to 2150 MHz).
2.
Ente ring via keyboa rd
Press the
value of the desired frequency in MHz, with
figure acts as a confirmation). The
[35] key (the frequency indi cat ion di sappears). Then select the
SHIFT
two decima l figures
PROLINK-7
will wo rk out the synthesised
(the second
frequency closer to the value keyed and shows it on the alphanumeric display.
If the entered frequency corresponds to a different band from the programmed,
the band will be changed to the correct value for the new frequency.
4.2.4 Channel selection
With the
CHAN/9
[33] key, select the channel tuning mode (in the upper righthand corner of the alphanumeric display [14]). The name of the tuned channel will be
displayed. By means of the
TUNE/SELECT
[9] selector we select the desired channel.
4.2.5 Measuring mode selection
Using the
PROLINK-7
, the user can take different kinds of measurements,
depending on the standard, the band and the available options:
T erre stria l bands:
Analogue channe ls:
LEVEL
VIDEO/AUDIO
CARRIER/NOISE
Digital cha nnels:
DIGITAL CARRIER
CARRIER/NOISE
BIT ERROR RATE
Measurement of the video carrier level
Measurement of the video-to-audio carrier ratio
Video carrier-to-noise ratio
Measurement of the digital channel power
Digital channel carrier-to-noise ratio
Measurement of the bit error rate for QAM and
OFDM modulations (only OPT-107-72 and OPT-10773, respectively)
S a te llite ba n d:
Analogue channe ls:
LEVEL
CARRIER/NOISE
Digital cha nnels:
DIGITAL CARRIER
CARRIER/NOISE
BIT ERROR RATE
Measurement of the video carrier level
Carrier-to-noise ratio
Measurement of the digital channel power
Digital channel carrier-to-noise ratio
Measurement of the bit error rate for QPSK
modulations (only OPT-107-71)
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- 99 -
To select a particular measuring mode, press the
LEVEL/0
[23]. On the right
part of he display the mode in use will blink, and may be changed by means of the
TUNE/SELECT
[14], press the
When the
[9] selector. W hen the desired operating mode appears on the display
LEVEL/0
[23] key again.
VIDEO/AUDIO
ratio measuring mode is selected the following
information appears on the [16] monitor:
Figure 5
.- Video/Audio ratio m easuring mode
When the
CARRIER/NOISE RATIO
measuring mode is selected the following
information appears on the [16] monitor:
Figure 6
.- Carrier/Noise ratio measuring mode
The user should be aware that the measurement will take severa l seconds to
stabilize (six seconds at the most). Each time the unit ends a measurement, an
asterisk will appear at the right side of the measurement (when a dot appears, it means
the unit is processing the measurement).
When measuring channels in the satellite band or digital channels, to measure
the C/N ratio correctly, the bandwidth of the channel must be defined previously, using
the
CHANNEL BW
function on the functions menu. The
PROLINK-7
takes the carrier
measurement in the centre of the channel (the frequency tuned) and the noise
measurement at the frequency tuned plus half the bandwidth of the channel, and
applies the necessary bandwidth and signal detector corrections automatically.
06/97 PROLINK-7
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