Pag. 35
SIRIO 2000T
SIRIO 2000T
SIRIO 2000T
SIRIO 2000T
SIRIO 2000T
Electronic Broadcast Equipment
Menu #06: Aux, Left, Right and Mpx level in dB
This field summarizes all toghether the present modulation in dB of the auxiliary, left, right and multiplex
signal as seen in their own menu fields - AUX - L - R - MPX
Menu #08: Internal Voltages
This field shows the internal regulated voltages. In SIRIO2000T Vs2 is comprised b18 and
+22V, depending on factory adjustment. Vs+ is +12.5 ±0.3V, Vs- is -13.0V (+1/-3V). A marked
difference from these values, may indicate anomalies.
Menu #09: Temperature, Data and Clock
This field shows the internal temperature, the present data and clock. To set data and clock it is required
to goto the command mode, with the 2nd level password authorisation. See menu #29.
Two temperature sensors read the room (A) and the output stage heatsink (H) temperature. The room
temperature is really that of the exhaust ventilation air and it is taken just behind the front panel. It is usually
2 - 3 °C higher than the external temperature at full output power: i.e. 47 °C assuming an external
temperature of +45 °C (the maximum allowed).
The heatsink temperature is usually 10 to 13°C higher than the room temperature @ full power.
Being the maximum allowed temperature limit +45°C, the transmitter progressively reduces its output
power when the ambient temperature is reported higher than 55°C or the heathsink is higher than 65°C.
There is a 5°C overtemperature range in which the equipment is allowed to work at reduced performance.
Besides, the equipment may reliably work in an ambient which is even 10°C higher than the maximum nominal
range, at less than maximum output power or for reduced lengths of time.
Consider that the higher the ambient temperature, the lower the MTBF. As rule of thumb the life is halved
each 10° C the temperature is increased. Assuming 10 years operating life at +25°C, which is not unrealistic,
it may become 2.5 years at +45°C.
Vs2 Vs+ Vs-
+20.2V +12.4V -12.9V
AUX L R MPX
-11.2 -3.0 -4.5 +0.0
T(A/H): +30°C +40°C
01 JAN 02 17:22:10
