Pag. 21
SIRIO 2000T
SIRIO 2000T
SIRIO 2000T
SIRIO 2000T
SIRIO 2000T
Electronic Broadcast Equipment
6) The first task to manage when turning on the transmitter as factory delivered is to enter the passwords.
At least the 3rd (the highest) level must be
immediately
changed: if any unauthorised people change it,
or if you loose it, there is no way to recover it and the transmitter may become unmanageable.
Access to the transmitter will require factory reprogramming or change of the internal CPU
.
For this reason be sure to write down and keep it
immediately
in a secure place:
remember there is
no way to read the password
after you have programmed and confirmed it.
For practically any parameters that may require some setting in the field, the 2nd level password is enough
and may be used for any standard service requirement. The main purpose of the existence of the 3rd level
is a security assurance for the user in case he loses control on the lower password levels and wants to
gain it back.
7) If not already done, adjust frequency and RF power as required, and check reflected power on the
transmitter display. To this aim search for the RF power menu and read the corresponding value of direct
and reflected output power.
For proper operation, the reflected power reading should typically be less than 10% of the direct power
value and 100W max at rated out (5%). Any higher reading may indicate that the antenna or the system
are not properly connected or functioning.
8) Check and/or set clock and data and all transmission parameters as required, i.e. channel sensitivity and
deviation, mono/stereo, preemphasis etc. Refer to the appropriate section of the manual.
5.5 LF CONNECTION AND PRESETS
LF wiring and impedance selection
SIRIO2000T supports balanced or unbalanced audio signals and allows selectable input impedance.
The inputs are basically balanced and have 600/10k ohm resistive impedance, with factory pre-set for
10k ohm. They can be connected to the balanced output of a professional mixer or to the unbalanced
one of a cheaper unit without any appreciable degradation.
Caange of the input impedance, if required, is one of the very few hardware pre-sets. For this purpose
you must remove the upper cover.
To avoid any risk, remove mains connection
before doing it. With
a #16 Phillips remove screws that hold the cover. Be sure to put them all back in place again when finishing
the work in order to mantain EMI/EMC and safety compliance.
Pre-set of input impedance is easily done by accordingly selecting the jumpers JP1 and JP2, easily located
on the input board just on the rear of the input connectors, as shown in the drawing. Impedance selection
is silk-screened on the component mask of the board.
LF audio mono or stereo inputs are “XLR” female connectors. They should be connected to the output
of the mixing table, or to any audio-processor that drives it, with a balanced coaxial cable connected to pin
3 (+) and pin 2 (-). The cable shield, connected to the ground through of the driving equipment, has to be
connected to pin 1.
