RETURN PATH ANALYSIS
RP-300
The need for interactivity
The use of the return band in cable networks
is in expansion. Internet services, Pay Per
View and Video On Demand are increasing
the need for interactivity. The systems have to
adapt to the new requirements and test instruments for installation, adjustment and maintenance with features covering these applications are becoming a must.
To test the return band there are two alternatives. The basic solution requires injection of
signal at the remote site and checking of the
reception levels in the head-end. This will normally involve two persons calling each other
for adjustments. The more sophisticated
method allows all testing by only one engineer
on the field with a signal generator and some
monitoring equipment. The former is a solu-
tion that involves at least two persons and the
latter requires heavy investments in test
equipment.
Low cost & high efficiency
Now PROMAX presents a compromise solution where only one operator is required for
testing and adjustment of the return path with
a low cost system.
On the remote site, the RP-100 Return Path
Multi-carrier Generator injects one or two
carriers (up to 4 with RP-100Q) into the
network.
Frequency of the carriers can be selected in
the range of 5 to 100 MHz. Level can be set
from 90 dBuV to 110 dBuV (30 dBmV to 50
dBmV) in 1 dB steps.
Return Path
The Return Path Monitor RP-300 displays the
return band at the head-end showing the
status in which the injected carriers are received there.
This screen can now be modulated into a free
channel and transmitted back through the
forward path. At the remote site, the engineers will be receiving a real time picture of the
signals seen at the head-end, and for those
operators who already own a spectrum analyser, such as the PROLINK-3. no further
investment in test equipment should be
needed.
By selecting the right frequency and level for
the various carriers on the RP-100 it will be
possible to easily and efficiently test and
equalise the return path.
RP-100
HEAD-END
RETURN PATH
RP-300
MODULATOR
CATV
FORWARD PATH
TV MONITOR
25
RETURN PATH ANALYSIS
RP-300
Simultaneous tests
With the RP-300 & RP-100 test set it is not only possible to properly install the system but it also allows a safety margin to prevent potential problems that may affect to service quality in the future. This is not possible if systems with fixed carriers are used.
* 19" RACK MOUNTED
* BNC VIDEO OUTPUT
* SPECTRUM ANALYSER
* 4 PILOT HYSTOGRAM
* BUILT-IN CRT MONITOR
* COMPATIBLE WITH ANY TONE GENERATOR
* EASY TO INSTALL
Another interesting advantage of using this
system is that it allows to carry out tests from different sites simultaneously. The only condition
will be to set different frequencies so that each
engineer can easily identify its source.
Additional features
The RP-300 includes all features in PROLINK-3+
so that being a Head-end unit it can also be used
to test several parameters in the network.
Specially interesting is the spectrum analyser
which can be used at any time as an online
analyser.
Specifications
RP-300
Tuning
Tuning modes
5 to 862 MHz
Frequency, Channel or Memory.
Channel tables configurable on demand
50 kHz
Threshold level selectable
99 positions for measurement configurations
Resolution
Automatic search
Memory
Level measurement
Measurement range
Reading
Measurement bandwidth
Audible indication
Accuracy
Terrestrial bands
Terrestrial TV & FM bands from 20 dBµV
to 130 dBµV (10 µV to 3.16 V)
Auto-range, reading is displayed on a OSD
230 kHz
LV audio. A tone with pitch proportional
to signal strength.
Monitor
Measurements
Analogue channels
Digital channels
Return path
Video
Video output
Mechanical features
Dimensions
Weight
4.5 “ B&W CRT
Level and Carrier-Noise ratio
Channel power and Carrier-Noise ratio
Graphic analysis of up to 4 carriers in the
return path
BNC (75 W). Monostandard composite
video signal depending on the selected
version (PAL-B/G/I/D/K, NTSC-M, PALM...) The contents of the screen are
reproduced in video
482 (W) x 132 (H) x 329 (D) mm
Rack 19’’ 3 U F266 mm
7 kg
±1.5 dB (30-120 dBµV, 48.25-861 MHz)
Test Equipment Depot
99 Washington Street
Melrose, MA 02176-6024
www.testequipmentdepot.com
800-517-8431
781-665-0780 FAX
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