This is 5W SCPA for the relay station of ISDB-T Digital Terrestrial Broadcasting. A low warp and the high stability have been achieved by adopting feed forward method as distortion compensation.
Because the band of 24MHz is secured, 4ch or less can be amplified at the same time.
JIS rack mounting type
External size: 480(W) x 99(H) x 500(D)mm (Excluding protrusions)
Mass: 25kg or less
| Input | Band width | 4 specified continuous channels 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 (4 OFDM wave of a specified channel) | |
| Monitor | -37dB±1dB against output level | |
| Monitor connector | BNC type J | |
| Power supply voltage | DC+48V±15% or less | |
| Power consumption | 200W 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 4 OFDM 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 / Meter output-Meter rating Full scale 300mV | |
| 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°C, the FET current is intercepted; warning is output, and maintained. |
| Compensation abnormal | When the internal compensations circuit power supply is off, or the state of IM is continued 40dBc±3dB for two seconds, warning is output. |
| Pilot abnormal. | When abnormality occurs in the compensations circuit pilot signal, warning is output. |
| Power supply | 96mV is output to 1.5k load when +48V. |
| FET current | 60mV is output to 1.5k load when 1.0A. |
| Output level | 200mV is output to 1.5k load when ratings are output, |
| Alarm interface | Non-voltage contact output Contact rating DC24V, 0.1A or less (ALARM) D-sub 15S M2.6 screw |
This equipment is a power amplifier for multichannel that amplifies the OFDM signal up to four waves or less to regulated transmitting power at the relay station of ISDB-T Digital Terrestrial Broadcasting.
This feature is that a low warp and the high stability have been achieved by adopting feed forward method as distortion compensations.
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.
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