Wandel & Goltermann RM-5 Communications Test Set
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Modello:
RM-5
Data:
1982
Categoria:
Gruppo:
Descrizione:
Radio-Link Measuring Setup 35/70/140 MHz
Informazioni
The most frequently used radio-link IF is 70 MHz, but IFs of
35 MHz and 140 MHz are gaining in popularity. Systems with a
small number of channels use 35 MHz; 70 MHz 1s used by
systems having up to 1800 channels. Analog systems with 2700
channels use a 140 MHz IF; in the future this IF will be
used by digital radio-links operating at high bit rates, and
by satellite links using TDMA. The RM-5 can handle all three
frequencies.
The RM-5 comprises a separate Generator section, the RMS-5,
and a receive section, the RME-5.
The RM-5 is the simple way to measure total baseband
distortion, the results are clear and easy- to-read. The
RM-5 cart also be used to measure various kinds of
distortion between IF ports, and also modulator, demodulator
and IF Filter distortion. All these facilities are essential
if faults are to be located, and the whole system as well as
each system component are to be optimally aligned.
A test modem is essential if basic noise, intermodulation
products, or the BB-B8 frequency response between IF ports,
are to be measured on wideband radio-link systems. The test
modem is available as an option.
In many applications the "noise calculation” option can be
used instead of the test modem.
Using IF-IF differential phase and differentia] gain
results, the option calculates the intermodulation noise in
three 8B test channels. All relevant system parameters are
used for the calculation.
The RM-5 is also ideal for test depts. that are planning to
introduce automated testing to cope with a large number of
test items, or are looking for a better and more logical way
of checking batches containing different items.
All the RM-5's Generator and receive functions can be
remote-controlled via a standard IEC 625/IEEE 488 Interface.
This means that the RM-5 can be easily integrated into
automated test systems.
Because the RM-5 has very low test frequencies (from 25
kHz], it is possible to test FM or PM systems having a small
number of channels.
However, to ensure’that all faults can be detected, the RM-5
also has test frequencies up to
5.6 MHz. These frequencies can also be demodulated in the
RM-51s receive section. A facility that automatically
reduces the sweep witdh prevents incorrect results.
Extreme accuracy, especially at high frequencies, is
essential for performing IF-IF distortion measurements.
Double modulation of and on the send-side, and tracking
demodulation on the receive-side ensure the RM-5 has the
required accuracy. The modern design of the RM-5 makes it
reliable and easy-to-operate. The Generator section and the
receive section are operated by buttons. Test parameters can
be set very accurately.
The RMS-5 Generator displays all the most important transmit
parameters by means of a multi - digit 7-segment LEO. The
parameters can be set by means of up/down keys.
Frequently used setups can be stored and called up when
required. An integral battery ensures that memory contents
are not lost when the RM-5 is switched off.
Because the Generator section is automatically tuned to the
test frequency, end-to-end measurements are easy to perform.
The sensitivity of the receiver is automatically adjusted to
handle a range of signal levels. This facility operates at
the IF and BB frequencies.
A new way of displaying results on the RME-5 has been
adopted. The display unit can now show curves and
alphanumeric results simultaneously in certain areas of the
screen. This means sweep traces can be read and understood
at a glance, and that any photos or printouts of the results
can be fully documented for use at a later date. The RME-5
has a "monitor" output for printing out the results on the
screen.
The IF level at the centre frequency and the test deviation
are shown on the screen, so that the operator always knows
if the test parameters are correct. The IF centre frequency
and the sweep width are determined by an integral frequency
counter; these parameters are also displayed on the screen.
A further feature which should be mentioned is the facility
for displaying two sweep curves on the screen
simultaneously. In other words, ary pair of results (¿31,
¿Jtf and ¿3U/UQ^, IF-IF frequency response and return loss)
can be selected via a pushbutton.
The calibrated ranges for the distortion parameters and the
frequency response measurements can be set by means of
up/down keys.
The RM~5‘s display capability and facilities for evaluating
sweep traces are greatly enhanced by microprocessor control.
The frequency markers are now a pair of variable line
cursors that are symmetrical about the IF centre frequency
(i.e. the vertical line through the centre of the screen).
Noisy traces, which often occur when measurements are made
via satellite, can be smoothed and made easier to read by
means of a noise averaging facility. Five averaging factors
are provided to handle signals with various degrees of noise.
To eliminate the intrinsic distortion of the RM-5
or to
adjust an item-under-test so that its characteristics follow
a given curve, it is possible to store a reference curve and
the difference curve obtained by subtracting the test curve
from the reference curve.
The RM-5 has special facilities for analysing distortion
curves. The linear component and the quadratic (parabolic)
component of the curves can be calculated over any frequency
interval. In the "Bessel spectrum" operating riwde, the
receiver displays the frequency-modulated input signal as a
spectrum - which means the RM-5 can be used as a spectrum
analyser. This mode can also be used to calibrate the test
frequency deviation meter in the RM-5
and to set the
sensitivity of modulators and demodulators.
To set the IF centre frequency of modulators, you can obtain
a display with higher resolution by selecting the frequency
Counter mode on the RME-5.
Instead of the <IEC 625> Interface board for remote
controlling the Rf€-5, it is possible to fit an x-y plotter
Interface that will only allow you to print out sweep curves.
The RM-5 also has an option for generating all the INTELSAT
IF-IF frequency response and IF-IF group delay tolerance
masks that are used for lining-up earth stations and
satellite communications paths. One keystroke selects the
mask you want.
The RM-5 is an up-to-date Test Set that can handle many
complex applications but is nevertheless easy to operate.
Tipo di manuale:
Manuale d'uso
Pagine:
220
Dimensione:
9.66 Mbytes (10130767 Bytes)
Lingua:
english
Revisione:
ID del manuale:
BN 0916
Data:
1982 01 01
Qualità:
Documento scansionato, la lettura in parte male, non in parte leggibile.
Data caricamento:
2017 01 22
MD5:
cf20d062b18229025e764345de9867b6
Scaricamenti:
498
Informazioni
BN 916, series D onwards
Operating Manual