This is the transmission conversion part for the basic function of the relay station at ISDB-T Digital Terrestrial Broadcasting system. It converts the IF signal one arbitrary channel wave. The SAW file is mounted on the part IF by one step.
Because one main body of 50mm in height can accommodate two units, one is for the operation method, and another is for the preliminary method, the mounting space can be saved.
Main body (TX20SR) mounting type
External size: 214.6(W) x 49(H) x 405(D)mm (Excluding protrusions)
Mass: 3.0kg or less
| Input | Frequency | 37.15MHz (Center frequency) |
| Level | -10dBm | |
| Impedance | 50Ω/TNC type (Unbalance) | |
| Output | Frequency | Specified channel of UHF band |
| Level | Adjustable from -10dBm between 0dBm. | |
| Impedance | 50Ω/BNC type (Unbalance) | |
| Standard signal input (Applies to RC20U1. ) |
Frequency | 10MHz |
| Level | -10dBm | |
| Impedance | 50Ω/PO51 type (Unbalance) | |
| Power supply voltage | DC+48V±15% or less | |
| Power consumption | 50W or less | |
| Use conditions | Continuous use | |
| 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.) | |
| Local oscillation frequency deviation | ±0.4Hz or less(When locked to external standard signal) |
| Tilt characteristic | Adjustable more than ±2dB at fc±2.79MHz |
| Frequency characteristic | 1.0dBp-p or less at fc±2.79MHz |
| Group delay characteristic | 100nsp-p or less at fc±2.79MHz |
| AGC response range | ±0.4dB or less to input change ±5dB |
| Input squelch function | Adjustable to input level -20dB to -15dB |
| IM | -55dB or less |
| Spurious characteristic | -63dBc or less(without IM) against the average output. |
| Standard signal pull-in range | Rated value ±10dB or less |
| Phase noise | Equivalence C/N＝50dB or more(10Hz to 1MHz) |
| Input return loss | 20dB or more(at input frequency ±3MHz) |
| Output return loss | 20dB or more(at 37.15MHz±3MHz) |
| Monitor output level | -20dB±1dB or less against the output level. |
| Local oscillation monitor level | -10dBm±2dB or less |
| Device delay time | 8μsec or less |
| Alarm monitoring item | Power failure |
| Abnormal output level | |
| PLL unlock PLL | |
| Abnormal input level | |
| Abnormal standard signal | |
| SW alert | |
| Alarm interface | Non-voltage contact output, Contact Specification DC24V, 0.1A or less(ALARM), D-sub 15S M2.6 type |
This is the transmission conversion part that coverts inputted IF signal to one arbitrary channel.
Because of mounting two units in the main body (TX20SR), it is possible to correspond to the relay broadcasting system of two methods.
This structure adopts the rack mounting type of JIS 1H and a half size unit construction, therefore, It contributes to the miniaturization, and It has the flexibility of the right and left division of the first method and the second method when the rack is mounted.
It provides with the watch and the control operation in accordance with "Transmission equipment commonness specifications for the digital terrestrial broadcasting" (Orange Book), and it is possible to connect it with the basis part switch control equipment, the PA switch control equipment, or etc. This corresponds to UHF all channels, and can do the channel change easily by exchanging the crystal oscillator units.
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