SCPA Relay Stations

SCPA relay station system - Outline view

AS2037B/22: 5W SCPA relay station system
Signal diagram of TS-TTL relay system using dual SCPA method

(When each box is clicked, it links with a corresponding product specification.)

Outline

It is SCPA relay station system which receives the broadcast wave transmitted by the previous station, gives necessary processing, and sends.

Outline of operation

Basic part
1. It distributes UHF television channel signal that is the input signal with the divider in two lines.
2. It removes the undesired signal, amplifies with AGC, adjusts the output level, and converts the frequency into the IF signal with the reception conversion unit.
3. It converts the IF signal into the RF signal with the frequency in the transmission conversion part.
SCPA power amplification part
1. It amplifies the output of the transmission conversion part with the SCPA power amplifier.
2. It selects the operation line and the preliminary line and outputs it with PA switcher. (High-speed switch operation of 10msec or less)

Control and monitor

Control
Switch of system on operation side/standby side (The starting up operation test on the standby side power amplifier is also possible.)
1. Auto / Remote
2. Manual
Monitor
1. Alarm state:
  It depends on the display of the alarm of the control system equipment, the alarm panel, and each unit.
2. Signal operation:
  It confirms the transmitting power, the power of PA ,the voltage, and the current are confirmed with the check meter of meter panel.
  Moreover, it can confirm the level with the monitor connector of each unit.
3. It can confirm the input-voltage and the output-voltage of the power supply with the monitor terminal and the terminal stand of the MCCB panel.

General specification

It depends on "Transmission equipment common specifications for the Digital terrestrial broadcasting" (Orange Book).

DTV Relay System / SCPA Composition equipment list
Classification	Name of articles	Pet name
Front End	2 adjacent channel waves	FI2MF2
	input divider	FD2M21
	Reception conversion unit for SFN with 1section of SAW filter	RC20U0
	Main body for reception conversion	RX20SR
Excitation	Transmission conversion part with 1 section of SAW filter	TC20U0
	Local oscillator unit	-
	CH BPF	[6840CD]
	Main body of transmission conversion part	TX20SR
Power amplification	5W SCPA	PA2S37
	Main Body for Power amplifier 0.5W/1.5W/5W	PA21SR
	PA switcher(Type I, Less than 10msec switching operation)	SW2PR0
	Standard type output filter (H=150mm)	FO2S00
Oscillator	Rb oscillator	RB20S0
Power supply	DC48V 30A Power supply unit	PU2030
	Shelf board for Power supply unit	PS2030
	Arrester board	TP20Z0
	AC MCCB	CB20A1
	DC MCCB	CB24B0
Meter panel	Meter panel	MP2MA0
Alarm panel	Control alarm panel	AP21S0

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