This is 5W SCPA for the relay station of ISDB-T Digital Terrestrial Broadcasting. Because the main body can mount two units, it excels small in the mounting efficiency, and the miniaturization can be attempted.
Main body (PA21SR) mounting type
External size: 214.6(W) x 99(H) x 404.5(D)mm (Excluding protrusions)
Mass: 8kg or less
Input | Band width | Specified single channel between 470MHz to 770MHz |
Impedance | 50Ω/TNC type (Unbalance) | |
Level | -10dBm | |
Output | Band width | Same channel as input |
Impedance | 50Ω/TNC type (Unbalance) | |
Standard gain | +47dB | |
Standard level | 5W (1-OFDM wave of a specified channel) | |
Monitor | -35dB±1dB against output level | |
Monitor connector | BNC type J | |
Power supply voltage | DC +48V±15% or less | |
Power consumption | 150W or less | |
Environmental requirements |
Temperature | -10°C to 45°C (Range for in-spec) |
-20°C to 60°C (Range for spec restorable) | ||
Humidity | 45% to 90% RH (Without dew.) | |
Cooling method | Forced air cooling | |
Use conditions | Continuous use |
I/O VSWR | 1.2 or less (Do not destroy by shorting or opening the input-output terminal.) | |
Amplitude-frequency characteristics | 0.5dBp-p or less(Within using band) | |
IM | -50dB or less (When OFDM1 wave 5W is output) | |
Changeable gain range | -6 dB or less from +2 dB or more finishes must being changeable compared with 5W. | |
Output fluctuation | Within ±0.5dB in the performance guarantee temperature. | |
Alarm monitoring item (At mounting on PA21SR) |
Power failure | Each DC voltage of power supply part is observed and warning is output by the change of ±20% or more. |
Output abnormal | When the output becomes following the setting, warning is output. | |
PA abnormal | Each FET current are observed and When it changes to -30% or less of idol (current at a no signal), or to +30% or more of the current outputs ratings, the FET current is intercepted; warning is output, and maintained. | |
FAN abnormal | When fan is stopping, or becoming 700mi-1n or less (designed value), warning is output. | |
Temperature abnormal | When the FET temperature becomes +85℃, the FET current is intercepted; warning is output, and maintained. | |
Alarm interface (At mounting PA21SR) |
Non-voltage contact outputContact rating DC24V, 0.1A or less(ALARM)D-sub 15S M2.6 screw | |
Meter output (At mounting on PA21SR) /Meter rating Full scale 300mV/1.5kΩ |
Level | 200mV is output to 1.5k load when ratings are output, |
Power supply voltage | 96mV is output to 1.5k load when +48V. | |
FET current | 60mV is output to 1.5k load when 1.0A. | |
Connector | D-sub 9S M2.6type |
This equipment is a power amplifier for a single channel that amplifies the output of the transmission conversion to regulated transmitting power at the relay station of ISDB-T Digital Terrestrial Broadcasting.
This 2 equipments can be mounted on 1 main bodies (PA21SR), and can correspond to the relay broadcasting system of 2 method.
Because this size is the rack mounting type of JIS 2H and a half size unit construction, it contributes to the miniaturization, and it has the flexibility of the right and left division of the first method and the second method etc. when the rack is mounted.
It provides with the watch and the control operation in accordance with the transmission equipment commonness specifications for the digital terrestrial broadcasting (Orange Book), and it is possible to connect it with the PA switch control equipment etc. Moreover, it has the function to output the output level, the power-supply voltage, and the FET current as DC voltage to display it to the meter.
Steady operation is possible, because the fan for the forced air cooling that can be exchanged is installed at front side, forward.
And the inside design is considered the ventilation efficiency.